Which of the following is an example of a scalar quantity?
displacement
energy
momentum
velocity
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Exam code: 9PH0
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Motion
Which of the following is an example of a scalar quantity?
displacement
energy
momentum
velocity
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A ball was dropped from rest, from a height above the ground. The ball bounced back up to about half its initial height.
Which graph shows how the velocity v of the ball varied with time t ?

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A trapdoor is fixed to a vertical wall with a hinge. A wire is attached to the other end of the trapdoor and inclined at an angle of 60°, as shown. The wire holds the trapdoor horizontal.

Which of the following shows the free-body force diagram for the trapdoor?

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A ball is thrown vertically upward. Assume air resistance is negligible.
Which of the following graphs shows how the vertical component of the velocity varies with time from when the ball is thrown to just before it hits the ground?

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