Chapter 3: Linear Motion

Question 1

A car is driving at a steady 15 m/s around a circular track on level ground. Which statement about the car’s velocity and spreed is accurate?

Answer 1

The car’s speed is constant, but the velocity is changing

Question 2

When we sit in a bus that is traveling down the road, we would describe ourselves as not moving, but a person sitting on a bench would say that we are in motion. This is an example of:

Answer 2

Relative Motion

Question 3

Instead of dropping a ball, you throw a ball directly downward. After releasing the ball, what is the magnitude of its accelerations?

Answer 3

9.8 m/s^2

Question 4

A ball is thrown straight upward. What is the velocity of the ball at the top of its ascent?

Answer 4

Zero

Question 5

Galileo said the steeper the slope of an incline plane, the greater the acceleration of the ball. What is the magnitude of the ball’s acceleration if it falls vertically?

Answer 5

9.80

Question 6

The reading on a car’s speedometer is a measure of its

Answer 6

Instantaneous speed

Question 7

When dropped, a ball will

Answer 7

Fall a farther distance during the second than during the first second

Question 8

When you throw a ball directly upward, what is true about its acceleration?

Answer 8

The ball’s acceleration is always directed downward

Question 9

1. Acceleration

Answer 9

The rate of change in velocity

Question 10

2. Velocity

Answer 10

How fast and in what directions an object covers a distance

Question 11

3. Distance

Answer 11

How far something travels

Question 12

4. Speed

Answer 12

How fast an object covers a distance

Question 13

To define the position of an object in a plane, you need to measure

Answer 13

The object’s distance from a reference point and its angle measured from a reference line

Question 14

A skateboarder is traveling down the sidewalk at a rate that does not change

Answer 14

The skateboarder is moving at a constant speed

Question 15

What is true about an object that is in free fall

Answer 15

1) During each second of free fall, the object gains approximately 10 m/s in velocity
2) It accelerates with a magnitude of 9.8 on Earth
3) The acceleration is dependent on the amount of gravity

Question 16

What throwing a ball upward, what is the magnitude of its acceleration at the top of its ascent?

Answer 16

9.8 m/s^2

Question 17

Which of the following is classified as an acceleration?

Answer 17

1) Going around a curve at a constant speed
2) A decrease in velocity
3) An increase in velocity

Question 18

When you throw a ball directly upward, what is true about its acceleration?

Answer 18

The ball’s acceleration is always directed downward

Question 19

If a stone is thrown upward with a velocity of 30 m/s, at what velocity will it return to your hand?

Answer 19

-30 m/s

Question 20

Of the following choices, which is the best description of g?

Answer 20

“g” is the magnitude of the acceleration due to the force of gravity

Question 21

A car is traveling in an eastward direction, and for every second it travels the car cover less distance. What is the direction of the car’s acceleration vector?

Answer 21

Westward

Question 22

Which of the following objects is considered to be in the free fall?

Answer 22

A hammer that is tossed upward by an astronaut on the moon (where there is no atmosphere)

Question 23

When you drop a ball, what is true about its motion?

Answer 23

It falls and increases in speed at a rate of 9.8 m/s every second

Question 24

If an object’s acceleration vector point in the same direction as its instantaneous velocity vector then you can conclude:

Answer 24

The object is speeding up

Question 25

You are going to swim across a stream with a rapid current. You start swimming, aiming at a large tree directly across from you. You end up

Answer 25

Downstream from the tree

Question 26

A car is traveling down the road, and for every second its travels, the car covers less distance. This mean that:

Answer 26

The car is slowing down

Question 27

Which of the following are true about a car traveling at 50 km/hr in a circle?

Answer 27

1) The car has a constant speed
2) The car has a changing velocity
3) The car is accelerating

Question 28

If an object’s acceleration vector points in the “opposite” direction of the instantaneous velocity vector, then you can conclude:

Answer 28

The car is slowing down