CP Workbook
Action-Reaction #2
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Refer to the following information for the next thirteen questions.
Nellie Newton holds an apple weighing one newton at rest on the palm of her hand. The force vectors shown are the forces that act on the apple.
To say the weight of the apple is 1 N is to say that a downward gravitational force of 1 N is exerted on the apple by
the earth
her hand
Nellie's hand supports the apple with normal force N, which acts in a direction opposite to W. We can say N
equals W
has the same magnitude as W
Since the apple is at rest, the net force on the apple is
zero
nonzero
N is equal and opposite to W. We ____ say that N and W comprise an action-reaction pair.
can
cannot
The reason is because action and reaction always
act on the same object
act on different objects
and here we see N and W
both acting on the apple
acting on different objects
In accord with the rule, "If ACTION is A acting on B, then REACTION is B acting on A," if we say action is the earth pulling down on the apple, reaction is
the apple pulling upon the earth
Nellie's hand pushing up on the apple
To repeat for emphasis, we see that N and W are equal and opposite to each other
and comprise an action-reaction pair
but do not comprise an action-reaction pair
Another pair of forces is N [shown] and the downward force of the apple against Nellie's hand [not shown]. This force pair ____ an action-reaction pair.
is
is not
Suppose Nellie now pushes upward on the apple with a force of 2 N. The apple
is still in equilibrium
accelerates upward
and compared to W, the magnitude of N is
the same
twice
not the same, and not twice
Once the apple leaves Nellie's hand, N is
zero
still twice the magnitude of W
and the net force on the apple is
zero
only W
still W - N, a negative force
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Paul G. Hewitt
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