Science Test

Front 1

What is motion?

Back 1

Motion is when a distance from another object changes

Front 2

How can an object be in motion and not in motion at the same time? Give example

Back 2

Point of view/ reference point
EX: flying on an airplane

Front 3

What is the difference between speed and velocity?

Back 3

speed is how fast an object is going and velocity is speed in a given direction

Front 4

what is the formula for calculating speed/velocity

Back 4

s=d/t

Front 5

What is acceleration?

Back 5

acceleration is a rate in which velocity changes

Front 6

How could an object accelerate without changing speed?

Back 6

change in direction

Front 7

What are the three ways an object can accelerate?

Back 7

increase in velocity, decrease in velocity and change in direction

Front 8

What does the slope of a distance v time graph indicate about an objects motoin?

Back 8

it indicates velocity

Front 9

How do you determine if an object is giong faster or slower than another object?

Back 9

by if the slope is steep or flat

Front 10

What does the slope of a velocity v time graph indicate about an object's motion?

Back 10

slope indicates acceleration

Front 11

velocity v time graph: wat does it mean if the slope is upward? downward? flat?

Back 11

upward: increasing velocity---downward: slowing down---flat: constant velocity

Front 12

How could you tell if an object came to a complete stop?

Back 12

the line would be going downward

Front 13

how fast will an object be going if it accelerates at a rate of 5/m/s/s for 8 seoconds?

Back 13

.625m/s/s

Front 14

explain how Aristotle and Galileo would explain a pool ball slowly rolling to a stop?

Back 14

They say that it comes to its natural state of rest and that once an object is in motion, no force is needed to stay in motion

Front 15

What is Newton's first law of motion?

Back 15

an object at rest stays at rest and an object in motion stays in motion until acted on by an unbalanced force.

Front 16

what is force?

Back 16

any push or pull that causes an object to accelerate

Front 17

what are the units used to measure force?

Back 17

newtons or Kg*m/s2

Front 18

what is balanced force?

Back 18

equal forces acting on an object in opposite directions: causes no change in motion

Front 19

what is the net force of a balanced force?

Back 19

0

Front 20

under what two condidtions can an object be experiencing a balanced force?

Back 20

static/mechanical equilibrium--at rest or at constant speed

Front 21

what is an unbalanced force?

Back 21

an unequal force that changes an object's motion

Front 22

what is the net force of an unbalanced object?

Back 22

the combination of all forces acting on an object

Front 23

what does an unbalanced force cause an object to do?

Back 23

change in motion

Front 24

why is it harder to get an object in motion then it is to keep it in motion?

Back 24

difference between balanced and unbalanced. Unbalanced takes more force then balanced

Front 25

What is Newton's Second Law of motion?

Back 25

force=mass x acceleration

Front 26

What is the relationship between force and acceleration?

Back 26

the relationship is that force causes acceleration

Front 27

what is the relationship between mass and acceleration

Back 27

the more mass there is in an object, the more its going to accelerate

Front 28

what is newton's third law of motion?

Back 28

for ever action there is an equal but opposite reaction

Front 29

what is friction?

Back 29

the force that one object exerts on another object when the two rub against each other

Front 30

what does friction cause?

Back 30

objects to slow down, resist motion, produces heat

Front 31

what two factors affect the frictional force between two objects?

Back 31

surface texture and pressure between surfaces

Front 32

what are the three types of friction--list from least to greatest

Back 32

rolling, fluid, and sliding friction

Front 33

what is gravity?

Back 33

a force that pulls objects towards the earth

Front 34

what is the rate of acceleration due to gravity?

Back 34

9.81m/s/s2 or 10

Front 35

If gravity pulls all objects at the same rate, what causes objects to fall at different rates?

Back 35

air resistance

Front 36

what is terminal velocity?

Back 36

the maximum belocity a falling object can achieve

Front 37

what causes terminal velocity? wat force is it?

Back 37

when force of air resistance=force of gravity object stops accelerating

balanced force

Front 38

what is the difference between mass and weight?

Back 38

mass is the quantity in an object and weight is the gravitational force exerted on an object

Front 39

if you went to the moon what would happen to your mass? your weight?

Back 39

mass--increase
weight--decrease

Front 40

why do three objects that are shot horizontally at different rates all hit the ground at the same time?

Back 40

--gravity is independent of horizontal velocity


--if you shoot hte ball fasste enough it wil never fall back to earth
--object stays in orbit

Front 41

descrive how the balance of gravity and inertia help keep a satellite inorbit around the earth?

Back 41

it helps keep it in orbit because inertia goes horizontally and gravity goes down. there is a curved line in the middle that keeps the earth orbitting. if you threw an object fast enough it would circle the earth.

Front 42

what would happen if the satellite lost velocity? if there was no gravity?

Back 42

lost velocity--it would go horizontally
no gravity--fall straight down

Front 43

what two factors affect the amount of gravitational force between two objects? how?

Back 43

mass and distance

more mass leads to more gravitational pull and the closer together more gravitational pull