Physics Concepts Quiz

When no forces act on moving objects their paths are normally

• straight lines.

• circles.

• ellipses.

• all of the above

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is

• equal to its weight.

• equal to its weight divided by its mass.

• equal to its mass times its weight.

• none of the above

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If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in

• a curved path.

• an outward spiral path.

• an inward spiral path.

• a straight-line path.

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Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

• follow a circular path.

• slow down.

• follow a straight-line path.

• stop.

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Which concept is being illustrated when a tablecloth is quickly yanked beneath dishes resting on a table?

• equilibrium

• friction

• support force

• inertia

When you flick a card from beneath a coin that hardly moves, you're illustrating

• inertia.

• equilibrium.

• support force.

• friction.

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is

• zero.

• less than 30 m/s but more than zero.

• about 30 m/s.

• more than 30 m/s.

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If your automobile runs out of fuel while driving, the engine stops. You don't come to an abrupt stop due to

• inertia.

• gravity.

• resistance.

• the principle of continuation.

When a rocket ship gaining speed in outer space runs out of fuel, it

• gains speed for a short time, then slows down to a constant velocity.

• gains speed for a short time, slows down, and eventually stops.

• no longer gains speed.

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A moving van with a stone lightly glued to the midpoint of its ceiling smoothly moves at constant velocity. When the glue gives way, the stone falls and hits the floor

• ahead of the midpoint of the ceiling.

• exactly below the midpoint of the ceiling.

• behind the midpoint of the ceiling.

• none of the above

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