# Physics 101 Test 1

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### Two factors that greatly affect air resistance on falling objects are the

size and speed of the object

### No work is done by gravity on a bowling ball that rolls along a bowling alley because

the force on the ball is at right angles to the ball's motion.

acceleration.

0 N.

### A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor

exactly below the midpoint of the ceiling.

decreases.

6 N

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

distance and time.

### A heavy object and a light object are dropped at the same time from rest in a vacuum. The heavier object reaches the ground

at the same time as the lighter object.

unchanged.

first law.

2 W.

80 J

the light woman

### The last instant just before an airplane crashes a passenger jumps out the door and falls only two feet to the ground. The passenger is

probably hurt or killed

100 m/s

mass

15 seconds

### When a rock thrown straight upwards gets to the exact top of its path, its

velocity is zero and its acceleration is about 10 meters per second per second.

### If you drop an object, it will accelerate downward at a rate of 9.8 meters per second per second. If you instead throw it downwards its acceleration( in the absence of air- resistance) will be

9.8 meters per second per second

220

1000 N

twice as much

newtons

10 m/s

### A force is a vector quantity because it has both

magnitude and direction

300 m

20 m/s

10 N

all of these

500 N.

### An object following a straight-line path at constant speed

has zero acceleration.

inertia.

300 N upward.

### If an object moves with constant acceleration, its velocity must

change by the same amount each second.

10 times as much

### Your weight is

the gravitational attraction force between you and the Earth.

Volkswagen.

### If you push for a half hour or a whole hour against a stationary wall

no work is done in either case.

### A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that

the milk carton has inertia.

### A rock weighs 30 N on Earth. A second rock weighs 30 N on the moon. Which of the two rocks has the greater mass?

the one on the moon

2

the bottom.

zero

### A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water

is the same for each bullet.

speed

9.8 N.

twice as much.

3000 m/s.

### An coconut and a feather fall from a tree through the air to the ground below. The amount of air-resistance force is

greater on the coconut.

5 N.

10 N.

500 N.

0.

20 km/h.

0

### 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

follow a straight-line path.

### Distance is to displacement as

speed is to velocity.

16 times the KE.

force.

2000 N

### What task requires the most work; lifting a 50-kg sack 2 meters or lifting a 25-kg sack 4 meters?

Both require the same amount of work.

### 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

250 m.

moving.

### If you do work on an object in one-third the usual time, your power output is

three times the usual power output.

### If a non-rotating object has no acceleration, then we can say for certain that it is

in mechanical equilibrium.

### 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

arrow's push against the bowstring.

halves.

Example:

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