Physics 221 Worksheet: Chapter 2, Kinematics 1

1) Which of the following statements is not true?

a) Distance is a scalar

b) Displacement is a vector.

c) Distance is measured directly from the initial position to the final position.

d) Displacement is measured directly from the initial position to the final position.

e) Displacement and distance are measured in the same units.

2) Distance divided by time is:

a) displacement.

b) average speed.

c) average velocity.

d) acceleration.

3) The rate of change of velocity is:

a) displacement.

b) speed.

c) time.

d) acceleration.

4) m/s² is a valid unit for:

a) displacement.

b) velocity.

c) acceleration.

5) An automobile accelerates from 20 m/s to 50 m/s in 5.0 s. Its acceleration is:

a) 6.0 m/s²

b) 14 m/s²

c) 30 m/s²

d) 70 m/s²

e) 150 m/s²

6) All freely falling objects dropped from the same height reach the ground :

a) with the same speed.

b) with the same acceleration.

c) in the same amount of time.

d) all of the above.

e) none of the above.

7) Constant velocity means that:

a) the acceleration is positive.

b) the acceleration is zero.

c) the acceleration does not change

d) the object is not moving.

8) An object is thrown straight up into the air. At the very top of its path:

a) the acceleration and velocity are both zero.

b) the acceleration is zero and the velocity is not zero.

c) the acceleration is not zero and the velocity is zero.

d) neither the acceleration nor the velocity is zero.

Ans: 1-c, 2-b, 3-d, 4-c, 5-a, 6-d, 7-b, 8-c

Physics 221 Worksheet: Chapter 2, Kinematics 2

1) When is an object’s average velocity equal to its instantaneous velocity?

a) Only when the velocity is constant.

b) Only when the acceleration is constant.

c) Never

d) Always

2) An advertisement for a car states that it can “go from zero to sixty in 8 sec.” This refers to its

a) average speed.

b) instantaneous velocity.

c) average acceleration.

d) instantaneous acceleration.

3) In which of the following cases will a car move the greatest distance?

a) The car travels at a constant speed v₁ for t₁ seconds and then accelerates to speed v₂ during the next t₂ seconds.

b) The car accelerates from initial speed v₁ to speed v₂ during the first t₁ seconds and then travels at constant speed v₂ for the next t₂ seconds.

c) Both cars travel the same distance.

4) A ball is dropped from the top of a building. One second later another ball is dropped. As they fall the difference in their speeds

a) increases.

b) decreases.

c) remains the same.

5) A ball is dropped from the top of a building. One second later another ball is dropped. As they fall the distance between them

a) increases.

b) decreases.

c) remains the same.

6) A ball is dropped from the top of a building. One second later another ball is dropped. The second ball will reach the ground

a) one second after the first ball.

b) more than one second after the first ball.

c) less than one second after the first ball.

d) One must know the height of the building to answer this question.

7) Two balls are thrown straight up. Ball A has twice the initial speed as ball B. How much higher will ball A travel than ball B?

a) twice as high

b) four times as high

c) Ö2 as high

8) A ball is thrown straight up. As it is rising:

a) The acceleration and velocity both point up.

b) The acceleration and velocity both point down.

c) The velocity points up and the acceleration points down.

d) The velocity points down and the acceleration points up.

9) A ball is thrown straight up. As it is falling back to the ground:

a) The acceleration and velocity both point up.

b) The acceleration and velocity both point down.

c) The velocity points up and the acceleration points down.

d) The velocity points down and the acceleration points up.

Ans: 1-a, 2-c, 3-b, 4-c, 5-a, 6-a, 7-b, 8-c, 9-b

Physics 221 Worksheet: Signs of Kinematic Quantities