Chapter 3: Linear Motion

Question 1

The two measurements necessary for calculating average speed are: a) distance and acceleration; b) velocity and time; c) distance and time; d) acceleration and time; e) velocity and distance.

Answer 1

c) distance and time

Question 2

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is

Answer 2

zero.

Question 3

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 constant velocity is

Answer 3

zero.

Question 4

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about: a) 15 m/s; b) a variable amount; c) depends on its initial speed; d) 5 m/s; e) 10 m/s.

Answer 4

e) 10 m/s.

Question 5

If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is

Answer 5

6 km/h/s

Question 6

During each consecutive second of fall, the distance a freely falling object will fall is

Answer 6

increasing.

Question 7

A car accelerates at 2 meters/s/s. Assuming the car starts from rest, how far will it travel in 10 s?

Answer 7

100 m

Question 8

Drop a rock from a 5-m height and it accelerates at 10 m/s2 and strikes the ground 1 s later. Drop the same rock from a height of 2.5 m and its acceleration of fall is about: a) the same amount; b) half as much; c) four times as much; d) twice as much.

Answer 8

a) the same amount

Question 9

While a car travels around a circular track at a constant speed, its: a) inertia is zero; b) velocity is zero; c) acceleration is zero; d) none of the above.

Answer 9

d) none of the above

Question 10

A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about

Answer 10

the same.