# Physics Final questions

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### Wherever there is an action force, there must be a reaction force which:

is exactly equal in magnitude

### An archer shoots an arrow, consider the action force to be exerted by the bowstring against the arrow. the reaction to this force is

the arrows push against the bowstring

### a player catches a ball. consider the action force to be the impact of the ball agianst the players glove. the reaction to this force is

the force the glove exerts on the ball

### player hits ball with bat. action force is impact of bat against ball. the reaction to this force is

the force that the ball exerts on the bat

1000N

### As a ball falls, the action force is the pull of the earths mass on the ball. the reaction force is the

pull of the balls mass on the earth

both the same

none of these

### an automobile and a baby carriage traveling at the same speed collide head on. the impact force is

the same for both

volkswagen

### your friend says the strongest man ever cant exert a 50N punch on a piece of tissue held in midair, you:

agree that it cant be done

400 N

True

True

True

False

### What is true about motion?

all motion is relative

### when you look at the speedometer in a moving car you see the cars

instantaneous speed

### which of the following could be considered an accelerator of your car

the gas pedal, brake, and steering wheel

### the two measurements necessary for calculating average speed are

distance and time

20 km/h

zero

### if an object moves with constant acceleration its velocity must

change by the same amount each second

6 km/h/s

6m/s

15 seconds

### the force required to maintain a rocket ship at constant velocity in force in free space is equal to

zero

it would be easier to lift a bowling ball on the mood than on earth, but just as hard to shake back and forth

True

False

### ToF the reason that bodies fall with same constant acceleration of 10 m/s in absence of air resistance is because the force of gravity is the same on all objects

False b/c w/m ratio is the same

True

False

False

True

True

### ToF a push on a 1 kg brick produces an acceleration, neglecting friction to equally accelerate a 20 kg brick one would have to push 10x harder

False, 20x harder

True

Car battery

mass

### an object maintains a constant acceleration unless there is a change in

its mass, the applied force, or the air resistance

the gravitational attraction force between you and the earth

force

### a rock weighs 30 N on earth a second rock weighs 30 n on the moon which has a greater mass

the one on the moon

twice as much

halves

6 N

is zero

10 N

2000 N

15,000 kg

3

400 N

acceleration

zero

the light woman

500 N

### a coconut and a feather fall from a tree to the ground, the amount of air resistance force is

greater on the coconut

decreases

is zero

300 N upward

### a feather and a coin will have equal accelerations when falling in a vacuum because

the ratio of each object's weight to its mass is the same

### the difference between impulse and impact force involves the

time the force acts

### it is correct to say that impulse is equal to

the change in momentum

momentum

none of these

### in order to catch a ball a baseball player reduces the force of impact on his hand because he

increases the time of impact

### padded dashboards in cars are safer in an accident than non padded because it enables an

increased time of impact

3 m/s

16 kg

greater

2,000 N

### an astronaut floating in space throws a baseball. if the ball floats away at 20 meters per second the astronaut will

move in the opposite direction but at a lower speed

Example: