Conceptual Physics- Midterm

Front 1

the newton is a unit of
-force
-mass
-inertia
-density

Back 1

force

Front 2

if an objects mass is decreasing while a constant force is applied to the object, the acceleration..
-remains the same
-decreases
-increases

Back 2

increases

Front 3

2 billiard balls having the same mass and speed roll toward each other. what is their combined momentum after they meet?
-0
-half the sum eof their original momentums
-twice the sum of their original momentums
-impossible to determine

Back 3

0

Front 4

a ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always...
opposite its velocity
directed upward
directed downward
in the direction of motion

Back 4

directed downward

Front 5

which has greater mass?
-auto battery
-king sized pillow

Back 5

auto battery

Front 6

while a car travels around a circular track at a constant speed, its..
inertia is zero
velocity is zero
acceleration is zero
none

Back 6

none

Front 7

a baseball player bats a bat with a force of 1000N. The rxn force that the ball exerts against the bat is __
less than 1000N
1000N
more than 1000N
impossible to determine

Back 7

1000N

Front 8

A 500N parachutist opens his chute and experiences an air resistance force of 800N. The net force on the parachutist is..
500N downward
500N upward
800N downward
300N upward
300N downward

Back 8

300N upward

Front 9

an object liften 10M gains 200J of potential energy. If the same object is lifted 20 m, its potential energy gain is..
half as much
2x as much
more than 4x as much
4x as much
the same

Back 9

2x as much

Front 10

an object that has kinetic energy must be..
at an elevated position
at rest
moving
falling

Back 10

moving

Front 11

an object is propelled along a straight line path by a force. if the net force were double, the objects acceleration would be..
-half as much
-4x as much
2x as much
the same

Back 11

2x as much

Front 12

a balll is tossed upward, assuming air resistance is negligible, which of the following is a true statement?
-the sum of its kinetic energy and potential energy at any point of its trajectory is always the same
-the ball has the most kinetic energy when it is released and right before it lands
-the ball has the most potential energy at the top of its path

Back 12

the ball has the most potential energy at the top of its path

Front 13

whenever the net force on an object is zero, its acceleration
-may be more than zero
-may be less than zero
-is zero

Back 13

is zero

Front 14

a hockey puck is set in motion across a frozen pond. if ice friction and air resistance are neglected, the force required to keep the puck sliding at a constant velocity is..
-zero
-equal to its weight
-equal to the product of its mass times its weight
-equal to its weight divided by its mass

Back 14

zero

Front 15

a sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This demonstrates that..
-the milk carton has no acceleration
-the milk carton has inertia
-gravity tends to hold the milk carton secure
-there is an action-reaction pair of forces
-none

Back 15

the milk carton has inertia

Front 16

when an automobile is braked to a stop, its kinetic energy is transformed to..
-energy at rest
-energy of motion
-heat
-stopping energy
-potential energy

Back 16

heat

Front 17

a heacy rock and a light rock of the same size are falling through the air from a tall building. the one that encounters the greatest air resistance is the..
-heavy rock
-light rock
-the same for both

Back 17

the same for both

Front 18

compared to a 1-kg block of solid iron, a 2 kg rock of solid iron has the same
-mass
-inertia
-weight
-all of these
-none of these

Back 18

none

Front 19

a skydiver who weighs 500N, reaches terminal velocity at 90km/h. The air restance on the diver is then..
-250N
-410N
-90N
-500N
-none

Back 19

500N

Front 20

for an action force, there must be a reaction force that..
-always acts in the same directions
-is slightly smaller in magnitude that the action force
-is equal in magnitude
-is slighyl larger in amplitude than the action force

Back 20

is exactly equal

Front 21

a 10N falling object encounters 10N of air resistance. The net force on the object is..
-10N
-0N
-6N
-4N
-none

Back 21

0N

Front 22

the scientist to first introduce the concept of inertia was..

Back 22

galileo

Front 23

a force is a vector quantity bc it has both>>
-mass and acceleration
-magnitude and direction
-action and reaction counterpoints

Back 23

magnitude and direction

Front 24

if a car accelerates from rest at 2 meters per second, its speed 3 seconds later will be

Back 24

6

Front 25

in sciencce, and educated guess is _____

Back 25

hypothesis

Front 26

an archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The rxn to this force is the ...
-combined weight of the arrow and the bowstring
-air resistance against the bow
-grip of the archers hand on the bow
-arrows push against the bowstring
-friction of the ground against the archers feet

Back 26

arrows push against the bowstring

Front 27

which of the following has the largest momentum relative tot he earths surface?
- a pickup truck speeding along a highway
-a dog running down the street
-mack truck parked
-tightrope walker
-science building

Back 27

pickup truck speeding along the hwy

Front 28

science and technology are..
-fundamentally different from each other
-really one and the same
-responsible for all the good in the world
-responsible for all the bad in the world

Back 28

fundamentally differetn from each other

Front 29

a mack truck and a volswagon traveling at the same speed have a head on collision. The vehicle that undergoes the greatest change in velocity will be the..
-

Back 29

volkswagon

Front 30

an object is pulled northward by a force of 10N and at the same time another force of 15N pulls it southward. the magnitude of the resultant force on the object is..

Back 30

5N

Front 31

which has greater kinetci energy..car traveling at 30km/hr or a car of half the mass traveling at 60 km/hr?

Back 31

60 km/hr car

Front 32

the force of friction on a sliding object is 10N. The applied force needed to maintain a constant velocity is

Back 32

10N

Front 33

when you are in the way of a fast moving object and cant get out of the way, you will suffer a smaller force of impact if you decrease its momentum over a _____

Back 33

long time

Front 34

2 objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the...

Back 34

heavier object

Front 35

compared to falling on a stone floow, a wine glass may not break when it falls on carper bc..

Back 35

stopping time is longer on the carpet

Front 36

a feather and a coin droped in a vaccuum fall with equal
-kinetic energies
-acclerations
-momenta
-forces
-none

Back 36

accelerations

Front 37

the force exerted on the tires of a car to directly accelerate it along the road is exerted by the
-air
-road
-engine
-tires

Back 37

road

Front 38

the 2 measurements necessary for calculating average speed are

Back 38

distance and time

Front 39

if you push an object 2x as far while applying the same force, you do..
-half as much work
-twice as much work
-the same amt of work
-4x the amt of work

Back 39

2x the amount of work

Front 40

strange as it may seem, it is just as hard to accelerate a car on a level surface on the moon as it is here on earth bc
-the weight of the car is independent on gravity
-the mass of the car is independent of gravity

Back 40

the mass of the car is independent of gravity

Front 41

as a ball falls, the action force is the pull of the earth on the ball. which also doubles..
-acceleration
-kinetic energy
-momentum
-all

Back 41

momentum

Front 42

as a ball falls, the action force is the pull of the earth on the ball. The reaction force is

Back 42

the pull of the balls mass on the earth

Front 43

2 factors that greatly affect air resistance on falling objects are the..
-size/speed of the object
-size/weight of the object
-size/mass of the object

Back 43

size/speed of the object

Front 44

the impulse momentum relationship is a direct result of
-newtons 2nd law
-newtons 4th law
-newtons 3rd law
-newtons 1st law

Back 44

newtons 2nd law

Front 45

if yoru auto runs out of fuel while you are driving, the engine stops but you dont come to an abrupt stop. The concept that best explains this is
-gravity
-acceleration
-inertia
-resistance

Back 45

inertia

Front 46

an object in mechanical equilibrium is an object
-at rest
-having no acceleration
-moving w constant velocity
-all

Back 46

having no acceleration

Front 47

a rifle recoils while firing a bullet. the speed of the rifles recoil is small bc..
-force against the rifle is smaller than against the bullet
-momentum is mainly concentrated in the bullet
-rifle has much more mass that the bullet

Back 47

rifle has much more mass than the bullet

Front 48

your weight is..
-the gravitational attraction force between you and earth
-equal to your mass
-a property of mechanical equilibrium
-all

Back 48

the gravitational attraction force between you and the earth

Front 49

a large and small person wish to parachute at equal terminal velocities. The larger person will have to..
-get a larger parachute
-pull upward on the supporting strands to decrease the downward net force

Back 49

get a larger parachute

Front 50

an auto and a baby carriage traveling at the same speed collide head on. the impact force is
-greater for the car
-greater for the baby carriage
-the same for both

Back 50

same for both

Front 51

suppose that a tiny gun made of a strong but very light material fired a bullet that is more massive than the gun itself. For such a weapon
-the target would be safer than the shooter
-recoil problems would be lessoned
-conservation of energy would not hols

Back 51

the target would be safer than the shooter

Front 52

a bow is drawn so that it has 40J of potential energy. When fired, the arrow eill ideally have a kinetic energy that is...
-40J
-more than 40J
-less than 40J

Back 52

40J

Front 53

a car traveling along a hwy needs a certain amt of force exerted on it to stop it in a certain distance. more stopping force is required when the car has
-more mass
-less stopping distance
-more momentum
-all

Back 53

all

Front 54

the power requried to exert 1N of force over a distance of 1m in 1 sec is..

Back 54

1 watt

Front 55

if a monkey floating in outer space throws his hat away, the hat and the money will both
-move away from each other, but at diff speeds
-move a short distance thens low down
-come to a stop after a while

Back 55

move away from each other but at diff speeds

Front 56

2 objects has the same size and shape, but one is much heavier than the other. When they are dropped from a towe, they reach the ground at the same time, but the heavier one has a greater
-momentum
-acceleration
-speed
-all
-none

Back 56

all

Front 57

a horse gallops a distance of 10km in 1/2 hr. its average speed is
-20km/hr
-30lm/hr
-40km/hr
15km/hr

Back 57

20km/hr

Front 58

compared to a 1kg block, a 2 kg block has 2x as much...

Back 58

weight

Front 59

padded dashboards in cars are safer than unpadded bc an occupant hitting the dash has..

Back 59

increased time of impact

Front 60

whirl a rock at the end of a string and it follows a circular path. if the string breaks, the tendency of the rock is to

Back 60

follow a straight line path

Front 61

a light woman and a heavy man jump from an airplane at the same time and open their same size chutes at the same time. which one will get to a state of zero acceleration first?

Back 61

the light woman

Front 62

according to newtons law of inertia, a RR train in motion should continue going forever even if the engine is turned off. We never see this bc
-

Back 62

always have forces that oppose their motion

Front 63

if an object is raised 2x as high, its potential energy would be

Back 63

2x as much

Front 64

an object at rest near the surface of a distant planet starts to fall freely. if the acceleration there is 2x that of the earth, its speed one sec later would be

Back 64

20m/s

Front 65

compared tot he mass of an object on earth, the mass of the same object on the moon is

Back 65

the same

Front 66

a ball rolling down an incline has its max kinetic energy at

Back 66

the bottom

Front 67

a feather and a coin will have equal accelerations when falling in a vaccuum bc
-the ratio of each objects weight to its mass is the same
-the force of gravity does not act in a vaccuum
-their velocities are the same

Back 67

the ratio of each objects weight to its mass is the same

Front 68

when you stand at rest on a pair of BR scales, the readings on the scales will always

Back 68

each be half your weight

Front 69

when a rocket ship accelerating in outer space runs out of fuel, it..

Back 69

no longer accelerates

Front 70

in science, a theory is ___

Back 70

a synthesis of a large body of well tested knowledge

Front 71

an object following a straight line path at constant speed
-has zero acceleratioorce acting upon it in the direction of motion
-has no forces acting upon it
-has a net f

Back 71

has no forces acting upon it

Front 72

whereas impulse involves time that a force acts, work involve the

Back 72

distance that a force acts

Front 73

it is correct to say that impulse is equal to
-momentum
-velocity multiplied by time
-the change in momentum it produces

Back 73

the change in momentum it produces

Front 74

if you push for a half an hour or a whole hour against a stationary wall..

Back 74

no work is done on the wall in either case

Front 75

a roller coaster car starts at the top of its first hill from rest. When does it have the greatest kinetic energy?

Back 75

at the bottom of the hill

Front 76

when a falling object has reached terminal velocity, its acceleration is

Back 76

0

Front 77

a car moves 4x as fast as another identical car. Compared to a slower car, the faster car has

Back 77

16x the KE

Front 78

a job is done slowly, while an identical hob is done quickly. Both jobs require the same amt of work, but diff amounts of

Back 78

power

Front 79

the conservation of momentum is most closely reated to

Back 79

newtons 3rd law

Front 80

a moving object has
-speed
-velocity
-energy
-mometum
-all

Back 80

all

Front 81

a bag of groceries has a mass of 10kg and a wt of
-abt 100N
-abt 1000N
-abt 10N
-abt 1N

Back 81

-abt 100N

Front 82

a car has a mass of 1000kg and accelerates at 2 meters per seond. What is the magnitude of the net force exerted on the car
-2000N
-10N
-1500N
-500N
1000N

Back 82

2000N

Front 83

of the sciences known as physics, chemistry, and biology, the most basic is..

Back 83

physics

Front 84

a 10kg brick and a 1kg book are dropped in a vaccuum, the force of gravity on the 10kg brick is

Back 84

10x as much

Front 85

a person is attracted toward the center of the earth by a 500N gravitational force. The earth is attracted toward the person with a force of

Back 85

500N