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1

A clown is walking west on board a train moving east at high speed.

How is the clown moving according to a cardiologist standing at theplatform while the train passes?

1 2 3 4

0 000

1. East, at the same speed

as the train2. East, slightly slower than

the train

3. West4. The clown is not moving

according to the

cardiologist

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2

Relative motion

Motion depends on the observer.In this case, if you use the telescope test

you can tell the clown is moving east from

the perspective of the cardiologist.

Answer: 2

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3

A hockey puck glides across the ice at a constant speed. In which

direction(s) are forces being exerted on the hockey puck?

1 2 3 4 5 6

0 0 0000

1. Up

2. Down3. In the direction of its

motion

4. Opposite the direction ofits motion

5. Both 1 & 2

6. 1, 2, and 3

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5

A baseball has just left the hand that threw it straight upward. What

is the direction of the net force on the ball?

1 2 3 4

0 000

1. Up

2. Down3. There is no net force

exerted on the ball

4. There is not enoughinformation to tell

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6

Motion with constant velocity

The ball has left the hand. The hand is not

touching. There is no force exerted by the

hand.

earth on ballF

ball

The only force on the ball is down. That'swhy the ball is accelerating in the downdirection

Answer: 2

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7

A brick rests on a table which sits on the floor. Which of

these would NOT appear on a free body diagram for thetable?

1 2 3 4 5

0 0 0001. Force of brick on table

2. Force of earth on table3. Force of table on earth

4. Force of floor on table

5. ALL of these wouldappear

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8

Force

A free body diagram for the table shows

forces exerted on the table.

earth on tableFbrick on tableF

floor on tableF

table

Answer: 3

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9

Which of these situations does NOT include a force

exerted by each underlined object on the other?

1 2 3 4 5

0 0 000

1. A book rests on the surface of

a desk2. A ball flies into the air after

leaving the hand that threw it

3. A wagon is pulled at constant

speed by a rope4. A brick falls freely toward the

earth

5. All of these describe a force

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10

Force

A force is a push or pull between two

objects.

The only objects that can push or pullwithout touching are:

the earth

a charged object

a magnetic object.

Answer: 2

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11

Chris drives 30km to work in 30 minutes. Grey drives 10km

to work in 12 minutes. Who has a faster average speed?

1 2 3 4

0 000

1. Chris

2. Grey3. They are the same

4. Answer cannot be

determined

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12

Speed

Chris:

30km

30min

1km/min

xv

t

=

=

=

Grey:

10km

12min

1km/min

xv

t

=

=

=