CP Workbook
Inertia
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Refer to the following information for the next two questions.
An astronaut in outer space away from gravitational or frictional forces throws a rock.
The rock will
gradually slow to a stop
continue moving in a straight line at constant speed
The rock's tendency to do this is called
inertia
weight
acceleration
Refer to the following information for the next question.
The sketch shows a top view of a rock being whirled at the end of a string in a clockwise direction.
If the string breaks, the path of the rock is
A
B
C
D
Refer to the following information for the next five questions.
Suppose you are standing in the aisle of a bus that travels along a straight road at 100 km/h, and you hold a pencil still above your head.
Then relative to the bus, the velocity of the pencil is 0 km/h, and relative to the road, the pencil has a horizontal velocity of
less than 100 km/h
100 km/h
more than 100 km/h
Suppose you release the pencil. While it is dropping, and relative to the road, the pencil still has a horizontal velocity of
less than 100 km/h
100 km/h
more than 100 km/h
This means that the pencil will strike the floor at a place directly
behind you
at your feet below your hand
in front of you
Relative to you, the way the pencil drops
is the same as if the bus were at rest
depends on the velocity of the bus
How does this example illustrate the law of inertia?
Refer to the following information for the next three questions.
Use the words mass, weight, and volume to complete the table.
The force due to gravity on an object
The quantity of matter in an object
The amount of space an object occupies
Refer to the following information for the next three questions.
Different masses are hung on a spring scale calibrated in newtons. The force exerted by gravity on 1 kg = 9.8 N.
The force exerted by gravity on 5 kg is
The force exerted by gravity on 10 kg equals
Make up your own mass and show the corresponding weight. The force exerted by gravity on ____ kg = ____ N.
Complete the following table based on the object's description.
Object
Mass
Weight
1-kg melon
1-N apple
14.5-N book
90-kg Uncle Harry
Refer to the following information for the next two questions.
CAUTION: Safety dictates that you do not try this experiment yourself!
Why isn't the girl hurt when the nail is driven into the block of wood?
Would this be more dangerous or less dangerous if the block were less massive? Explain.
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Paul G. Hewitt
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