Physics Multiple Choice Chapter 1

Consider drops of water leaking from a water faucet. As the drops fall they

get farther apart

When you look at the speedometer in a moving car, you can see the car's

instantaneous speed

Suppose you are given a position versus time graph. The slope of a line drawn tangent to a point on the curve of this graph describes what quantity?

instantaneous velocity

The graph above describes the motion of a cyclist. The graph illustrates that the acceleration of the cyclist

is constant

When a basketball player jumps to make a shot, once the feet are off the floor, the jumper's acceleration

is g; no more, no less

The hang time (time one's feet are off the ground in a jump) for most athletes is

less than one second

What is the SI unit of acceleration?

m/s^2

Which of the following units is the SI unit of velocity?

meter per second

The graph above describes the motion of a ball. At what point is the velocity of the ball equal to its velocity at B?

none of the above

Acceleration is defined as

rate of change of velocity

The graph above describes the motion of a cyclist. During the interval shown, the cyclist is

speeding up

Two students are standing on a fire escape, one twice as high as the other. Simultaneously, each drops a ball. If the first ball strikes the ground at time, when will the second ball strike the ground? (Disregard air resistance. Assume a = -g = -9.81 m/s)

t2 = sqrt2 * t1

What does the graph above illustrate about acceleration?

the acceleration varies

In the graph above, how does the acceleration at A compare with the acceleration at B?

the accelerations at A and B are both zero

When a car's velocity is positive and its acceleration is negative, what is happening to the car's motion?

the car slows down

If you drop a feather and a coin at the same time in a tube filled with air, which will reach the bottom of the tube first?

the coin

Acceleration is defined as

the rate at which velocity itself changes

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be

the same as the speed it had when thrown upwards

Which would hit the ground first if dropped from the same height in a vacuum-a feather or a metal bolt?

they would hit the ground at the same time

What is the speed of an object at rest?

0.0 m/s

The vertical height attained by a basketball player who achieves a hang time of a full one second is about

1.2 m

Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car's acceleration?

5 km/hr/s

Suppose a jumper claims a hang time of 2 seconds. Then that jumper must be able to jump a vertical distance of

5 m

A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car's average acceleration?

6 m/s^2

If a projectile is fired straight up at a speed of 30 m/s, the total time to return to its starting point is about

6 seconds

The graph above describes the motion of a ball. At what point is the speed of the ball equal to its speed at B?

D

Which of the following statements applies to the motion of a ball rising and then falling in free fall? I. The ball has constant acceleration as it moves upward. II. The ball has constant acceleration at the top of its path. III. The ball has constant acceleration as it moves downward.

I, II, III

A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball's path does it experience zero velocity and nonzero acceleration at the same time?

at the top of its path

In the graph above, what is the correct description of any location to the left of the zero?

negative position

A projectile is launched from a cliff 13 m high. it is in the air for 3.5 s. What was its initial velocity?

13.44 m/s

If a ball were equipped with a speedometer and allowed to fall freely on a planet where the acceleration due to gravity is 23 m/s2, the reading on the speedometer would increase each second by

23 m/s

A ball is thrown up with an initial velocity of 16 m/s and is caught at the same height it was thrown at. How long is it in the air for?

3.27 s

If you drop a feather and a coin at the same time in a vacuum tube, which will reach the bottom of the tube first?

Neither- they will both reach the bottom at the same time

A ball is thrown straight up. At the top of its path its instantaneous speed is

0 m/s

A train travels 6 meters in the first second of travel, 6 meters again during the second second of travel, and 6 meters again during the third second. Its acceleration is

0 m/s^2

According to the graph above, during which interval does the cat have the greatest positive velocity?

0-5 s

A freely falling object starts from rest. After falling for 1 second, it will have a speed of about

10 m/s

A car accelerates at 2 m/s2. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 20 m/s?

10 seconds

According to the graph above, the cat has the fastest speed during which interval?

10-15 s

Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is

60 km/hr

A freely falling object starts from rest. After falling for 6 seconds, it will have a speed of about

60.0 m/s

Which of the following situations represents a negative displacement? (Assume positive position is measured vertically upward along a y-axis.)

A cat jumps from a tree limb to the ground

The graph above describes the motion of a ball. At what point does the ball have an instantaneous velocity of zero?

C

When a car's velocity is negative and its acceleration is negative, what is happening to the car's motion?

The car speeds up

Which would fall with greater acceleration in a vacuum-a leaf or a stone?

They would accelerate at the same rate

Suppose an object is in free fall. Each second the object falls

a larger distance than in the second before

Which of the following line segments on a position versus time graph is physically impossible?

a vertical line

If you know the acceleration of a car, its initial velocity, and the time interval, which of the following can you predict?

a. the direction of the car's final velocity b. the magnitude of the car's final velocity c. the displacement of the car d. all of the above Correct

Speed is

a.the distance covered per unit time. b. all of the above. Correct c. always measured in terms of a unit of distance divided by a unit of time. d. a measure of how fast something is moving.

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by

about 10 m/s

A ball is thrown straight up. At the top of its path its acceleration is

about 10 m/s^2

When something falls to the ground, it accelerates. This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of g on Earth's surface?

about 10 m/s^2

In the absence of air resistance, objects fall at constant

acceleration

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

directed downward

When there is no air resistance, objects of different masses dropped from rest

fall with equal accelerations and equal displacements

Objects that are falling toward Earth in free fall move

faster and faster

Acceleration is defined as the CHANGE in

velocity divided by the time interval

As an object falls freely in a vacuum, its

velocity increases

In the graph above, a toy car rolls from +3 m to +5 m. Which of the following statements is true?

xi = 3 m

Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is NOT true?

your velocity is constant