G10 Physics Final Revision

In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.

• True

• False

• It depends on whether the collision is a head-on collision or a rear-end collision.

A box is placed on a table which rests on the floor. The box pushes on the table; the reaction force to the box's push on the table is the table's push on the floor.

• True

• False

In order to get an object moving, you must push harder on it than it pushes back on you.

• True

• False

A girl attaches a rock to a string, which she then swings counter-clockwise in a horizontal circle. The string breaks at point P in the figure, which shows a bird's-eye view (as seen from above). Which path (A-E) will the rock follow?

• Path A

• Path B

• Path C

• Path D

• Path E

If you pound a feather with a hammer, which one feels a greater force?

• always the feather

• always the hammer

• The size of the force is always exactly the same on both of them.

• If the feather moves, then it felt the greater force. Otherwise the force was the same on both.

A satellite is in orbit around the earth. Which one feels the greater force?

• the satellite because the earth is so much more massive

• the earth because the satellite has so little mass

• Earth and the satellite feel exactly the same force.

• It depends on the distance of the satellite from Earth.

You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must have been equal.

• true

• false

In order to lift a bucket of concrete, you must pull up harder on the bucket than the bucket pulls down on you.

• true

• false

If the rockets of a spaceship in outer space (far from all gravity) suddenly lose power and go off, the spaceship will gradually slow to a stop.

• true

• false

An elevator suspended by a vertical cable is moving downward but slowing down. The tension in the cable must be

• greater than the weight of the elevator.

• less than than the weight of the elevator.

• equal to the weight of the elevator.