Science Test 1 (Physcial Science 9Th Grade Block:3)

Front 1

Jeremy decides to cook some pasta noodles. He notices that the directions say to add salt to the water before bringing the water to a boil. The next day, Jerry asks his science teacher, Ms. Jackson, a question: "how does adding salt affect boiling temperature of the water?" Of course, Ms. Jackson asks Jeremy to plan and conduct an experiment to find the answer?

• Jeremy writes an excellent hypothesis before beginning his experiment. Which of the following is the hypothesis he wrote?

Back 1

Adding salt to the pasta water will cause the water to boil at a higher temperature.

Front 2

Jeremy decides to cook some pasta noodles. He notices that the directions say to add salt to the water before bringing the water to a boil. The next day, Jerry asks his science teacher, Ms. Jackson, a question: "how does adding salt affect boiling temperature of the water?" Of course, Ms. Jackson asks Jeremy to plan and conduct an experiment to find the answer.

• what was the control set-up for Jeremy's experiment?

Back 2

1 quart of boiling water with no salt added.

Front 3

Jeremy decides to cook some pasta noodles. He notices that the directions say to add salt to the water before bringing the water to a boil. The next day, Jerry asks his science teacher, Ms. Jackson, a question: "how does adding salt affect boiling temperature of the water?" Of course, Ms. Jackson asks Jeremy to plan and conduct an experiment to find the answer.

• The following graph summarizes Jerrys results. What conclusion can be made from these results?

Back 3

Adding salt to the water causes the water to boil at a higher temperature.

Front 4

Jeremy decides to cook some pasta noodles. He notices that the directions say to add salt to the water before bringing the water to a boil. The next day, Jerry asks his science teacher, Ms. Jackson, a question: "how does adding salt affect boiling temperature of the water?" Of course, Ms. Jackson asks Jeremy to plan and conduct an experiment to find the answer.

• based on Jeremy's findings? What would be a benefit of adding salt to the pasta water?

Back 4

When you add salt to the pasta water, the water can get hotter and pasta is cooked faster.

Front 5

A constant variable is:

Back 5

A variable that stays the same throughout an experiment.

Front 6

Most often, and experiment involving the scientific method begins a:

Back 6

Question

Front 7

A good hypothesis:

Back 7

May be described by all the above. (is one that can be tested by experiment, can be an educated guess predicting the outcome of an experiment, can only be formed when you know at least a little about what is going to happen.)

Front 8

Your motorcycle will not start. The process by which you solve this problem is called the:

Back 8

Scientific Method

Front 9

When Constructing a graph, the X – axis is most closely related to:

Back 9

The independent variable

Front 10

Hypothesis

Back 10

I educated guess about what will happen in an experiment

Front 11

Variable

Back 11

The factors that affect the results of an experiment

Front 12

Constants

Back 12

Factors that need to stay the same all through an experiment

Front 13

Control Group

Back 13

The group or subject that is used as a reference to normal

Front 14

Experimental group

Back 14

The group or subject that the independent variable is used on

Front 15

Which of the following hypothesis is written correctly?

Back 15

If the tennis ball was frozen, then it will not bounce as high as a tennis ball this is heated.

Front 16

A scientist hypothesis that the temperature at which a alligator's eggs incubated will determine whether the alligator will be male or female. The independent variable is.

Back 16

The temperature

Front 17

A scientist hypothesis that the temperature at which a alligator's eggs incubated will determine whether the alligator will be male or female. The dependent variable is.

Back 17

The gender of the baby alligators

Front 18

A scientist who want to study the affect of fertilizer on plants set up an experiment. Plant A gets not fertilizer, Plant B gets 5 mg. Of fertilizer each day, and Plant C gets 10 mg. Of fertilizer each day. Which plant is the control group.

Back 18

Plant A

Front 19

On this graph, the dependent variable is:

Back 19

Speed

Front 20

The type of relationship represented between variables in the graph pictured is:

Back 20

No relationship

Front 21

Centimeter

Back 21

The length of your foot

Front 22

Meter

Back 22

The length of a swimming pool

Front 23

Kilometer

Back 23

The distance between one town and another

Front 24

Millimeter

Back 24

The width of a human hair

Front 25

I'm one-half hour, A bicyclist traveled 20 km. What was the bicycle is average speed?

Back 25

40 km/hr

Hint 25

S=D/T

Front 26

Speed is:

Back 26

All of these (calculated by dividing the distance traveled by the time taken, zero to object at rest, a measure of how quickly an object gets from one place to another.)

Front 27

What is the speed of a jet plane to that travels 3,000 meters in 10 second?

Back 27

300 m/sec

Front 28

If the average speed of a drag racing car is 0.069 mi./s, how long would it take the car to complete a 1/4 mile (0.25 mile) straight track?

Back 28

3.6 seconds

Hint 28

T=D/S

Front 29

If an automobile travels at 30 m/s for two minutes, the car has traveled:

Back 29

3,600 meter

Hint 29

3,600 meters

Front 30

A bicycle rider would NOT be accelerating if her:

Back 30

Direction and speed were unchanged.

Front 31

Rocket sled accelerates from 10 m/s to 50 m/s in two minutes. What is the acceleration of the sled?

Back 31

20 m/sec ^2

Hint 31

A=Final speed-starting speed/ Time

Front 32

The slope of the position vs. time graph is equal to:

Back 32

Speed

Front 33

Calculate the speed of an object from the position versus time graph shown above. (Pay attention to where the motion begins)

Back 33

0.5 m/sec

Front 34

Match the position vs. time graph with correct speed vs. time graph.

Back 34

Back (Definition)

Front 35

Define points on the graph is the speed the greatest?

Back 35

Point 2

Front 36

In this speed versus time graph, the object at point C:

Back 36

Has negative acceleration.

Front 37

The value calculated by dividing the distance traveled by the time taken to travel that distance is referred to as __________.

Back 37

Speed

Front 38

The speed you have at a specific point in your journey is best called _______ Speed.

Back 38

Instantaneous

Front 39

The rate of change in the speed of an object is called ____________.

Back 39

Acceleration

Front 40

What happens when we slow down?

Back 40

• any time speed changes, acceleration occurs.

• even slowing down= acceleration.

• slowing down causes negative acceleration.

Front 41

Object tends to resist change in motion. This property is called:

Back 41

Inertia

Front 42

Compared to your weight on earth. If you were in the moon:

Back 42

Your weight would be less, but your mass would remain the same.

Front 43

Newton's first law is also known as:

Back 43

The law of Inertia.

Front 44

The cart is rolling down a ramp. If the angle of the ramp is increase to make the ramp steeper, the cart will:

Back 44

Accelerate faster.

Front 45

What is the mass of a rock that weighs 49 Newtons?

Back 45

5 kilograms.

Hint 45

(5* 9.8 or 49/9.8)

Front 46

A tow truck pulls a 2000 kg car with a net force of 4000 N. What is the acceleration of the car?

Back 46

2 m/sec^2

Hint 46

A=F/M?

Front 47

•What is the net force on the girl?

Back 47

0 N

Front 48

A 200-kilogram rocket accelerates at 50m/sec^2. How large is the net force required to cause an acceleration of this size?

Back 48

10000 N

Hint 48

F=M*A

Front 49

What is Newton's second law?

Back 49

F=M*A

Front 50

What is Newton's third law?

Back 50

For every action there is an equal and opposite reaction.

Front 51

Forces occur in _____.

Back 51

Pairs

Front 52

If those pairs ARE BALANCED, __ _______ _____.

Back 52

No movement occurs.

Front 53

If pairs ARE NOT EQUAL, _______ _____.

Back 53

Movement occurs.

Front 54

Momentum?

Back 54

Measurement of an object speed multiplied by mass.

Unit is Kg* m/sec= 1 hendren

Front 55

Gravity?

Back 55

Force applied by an object mass. (The larger the mass the larger the force of gravity.)

Weight= M*G

Front 56

Scientific method:

Back 56

1. Observe the opportunity/problem.

2. Become educated on topic.

3. Form a Hypothesis.

4. Design an experiment.

-experiment must test hypothesis.

5. Conclusion & Communication

-evaluate your hypothesis (show proof)

-data should be Clear & Short.

6. Graphs/ Presentation need to be simple reads.

Front 57

What is the difference between mass and weight?

Back 57

Mas

Front 58

A cars traveling down a straight stretch of highway at 90 km/h. The driver suddenly slams on the brake and brings the car to a quick stop. As a result, then belted passenger well at first:

Back 58

Continue to move forward in a straight line.

Front 59

On the surface of the Earth, he force of gravity on one kilogram is:

Back 59

9.8 Newtons

Front 60

The acceleration due to gravity is approximately 10 m/s squared. If a golf ball is drop from the 13th floor of a building, ignoring air resistance, after falling for three seconds the speed of the ball will be:

Back 60

30 m/sec

Hint 60

10*3= 30

Front 61

A book rests on a table. The force of gravity pulls down on the book with a force of 20 N. What prevents the book from accelerating downward at 9.8 m/s squared?

Back 61

The table presses back up on the book with an equal and opposite force of 20 Newtons.

Front 62

A rocket can fly into space because:

Back 62

The rocket pushes the exhaust gases backwards, and there is an equal an opposite reaction pushing the rocket forward.

Front 63

A stationary object has:

Back 63

Inertia but no momentum

Front 64

What is the momentum of a 0.15 kg baseball moving at 20 m/s?

Back 64

3 kg*m/sec.

Hint 64

P=M*V

Front 65

A 0.15 kg baseball and a 7.25 kilogram bowling ball are both rolling along at 3 m/s. Which object is easier to stop and why?

Back 65

The baseball because it has less Interia.

Front 66

What are the four types of friction?

Back 66

•sliding

•rolling

•Fluid friction(air or liquid)

•static

Front 67

A simple machine often multiplies your:

Back 67

force

Front 68

The human arm is an example of which class of lever?

Back 68

Third class

Front 69

Which of the following levers has the largest mechanical advantage?

Back 69

Lever A

Front 70

The engineering cycle describes how an invention gets from concept to reality. Which of the following best describes the order of steps in the engineering cycle?

Back 70

Design

build a prototype

Test

Evaluate

Front 71

Work may be measured using units of:

Back 71

joules

Front 72

The efficiency of a machine is usually expressed in:

Back 72

percent

Front 73

In science, work is defined as:

Back 73

force multiplied by the distance moved in a direction parallel to the force

Front 74

Calculate the work needed to lift a block weighing 4 newtons a distance of 10 meters.

Back 74

40 joules

Front 75

How much power is necessary to do 50 joules of work in 5 seconds?

Back 75

10 watts

Front 76

The efficiency of a modern bicycle is 95 percent. If you exert 200 joules in pedaling a bicycle on level ground, what is the work output?

Back 76

190 joules

Front 77

A gallon of gasoline contains chemical energy. If you pour a gallon of gasoline into your car, you could drive for about 20 miles on the highway (about 20 minutes). You could choose instead to run a lawn mower for an hour with one gallon of gasoline. If the gasoline were to come in contact with a fire, the entire gallon would burn in less than a minute. Which reaction has the most power?

Back 77

Burning the gasoline in a fire

Front 78

Which of the following is NOT considered a simple machine?

Back 78

Electric motor

Front 79

The efficiency of most machines is less than 100 percent. Due to friction, energy seems to be lost. While the energy is not truly lost, it does work that is not useful or is converted to:

Back 79

thermal energy

Front 80

When a ball is thrown into the air, the potential energy gained must come from its kinetic energy. As the ball gains potential energy, its speed will:

Back 80

decrease

Front 81

A marble rolls along the track below with no friction. The sequence of positions on the track listed in order from the lowest kinetic energy to the highest kinetic energy is:

Back 81

1, 5, 4, 2, 3, 6

Front 82

A system of pulleys is used to lift an elevator carrying a 3,300-newton load. Assuming the pulley system is nearly friction-free, approximately how far would 10,000 joules of energy lift the elevator?

Back 82

3 meters

Front 83

While sitting next to a campfire, Susan noticed several different forms of energy being transformed from the potential chemical energy of the wood. She correctly named all of the following forms of energy except:

Back 83

nuclear

Front 84

Potential energy is energy due to the:

Back 84

height of an object

Front 85

As a car is slowed, most of its kinetic energy is converted by the brakes to:

Back 85

thermal energy.

Front 86

Exercise may transform the chemical energy in the food you eat into:

Back 86

both kinetic and potential energy

Front 87

Which of the following block and tackle systems has the largest mechanical advantage?

Back 87

System C has the largest mechanical advantage

Front 88

A simple machine has an input force of 10 newtons and an output force of 100 newtons. What is the mechanical advantage of the simple machine?

Back 88

10

Front 89

A block and tackle system has an input force of 2.5 newtons and an output force of 10 newtons. What is the mechanical advantage of the system?

Back 89

4

Front 90

On a 10-speed bicycle, gears increase the mechanical advantage of the bicycle. In which of the following situations would you want the greatest mechanical advantage for the gear system?

Back 90

Climbing up a hill

Front 91

A block and tackle machine is used to lift a box that weighs 90 newtons. How much force do you need to pull on the rope if the machine has a mechanical advantage of 5?

Back 91

18 newtons

Front 92

A lever rotates around a fixed point called a:

Back 92

fulcrum

Front 93

If the output force of a lever is located between the fulcrum and input force, the lever is a:

Back 93

second class lever

Front 94

Ratio of the output force to the input force

Back 94

Mechanical Advantage

Front 95

Testable model of conceptual design

Back 95

prototype

Front 96

Application of science to solve problems

Back 96

engineering

Front 97

Point around which a lever rotates

Back 97

fulcrum

Front 98

Part of a lever that moves a rock, for example, when you apply a force

Back 98

arm

Front 99

Human arms and legs are examples

Back 99

Third class lever

Front 100

Force you apply to make a simple machine work

Back 100

input force

Front 101

The force a machine applies to accomplish a task

Back 101

output force

Front 102

The amount of work performed over time

Back 102

power

Front 103

Stored work

Back 103

energy

Front 104

A force being applied over a distance

Back 104

work

Front 105

Jennifer, who weighs 450 newtons, and Judy, who weighs 600 newtons, are standing at the bottom of a flight of stairs that is 4.00 meters high. Jennifer runs up the stairs in 2.0 seconds. Judy runs up the same stairs in 4.0 seconds. Compare the work done and the power generated by each girl’s run up the stairs. Be sure to include a unit with your answer.

a. How much work does Judy do?

b. How much work does Jennifer do?

c. Who does more work? Just type the name of the person.

d. How much power does Judy do?

e. How much power does Jennifer do?

f. Who is more powerful? Just type the name of the person.

Back 105

a. 2400 Joules

b. 1800 Joules

c. Judy

d. 600 Watts

e. 900 Watts

f. Jennifer

Front 106

Calculate the work done when a 50 newton object is lifted 5 meters using a block and tackle. Be sure to include the correct unit with your answer.

Back 106

250 Joules

Front 107

When the forces on an object are balanced, we say that the object:

Back 107

is in equilibrium.