Newton's Laws (Doug G7 Ch4 - Conceptual)

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.

• The forces are equal in magnitude.

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

• It depends on the weight of the box.

• The reaction force is the floor's push on the table.

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

• True

• False

• It depends on the friction between the object and the surface.

• Only if the object is at rest.

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

You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. From this observation, you can conclude that this train is

• speeding up.

• slowing down.

• changing direction.

• speeding up and changing direction.

• slowing down and changing direction.