Physics 3

After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals

Zero, since no force is necessary to keep it moving

If the force of gravity suddenly stopped acting on the planets, they would

Move in straight lines tangent to their orbits

If a hockey pick were to slide on a perfectly frictionless surface, it will eventually slow down because of its inertia.

False

The force due to gravity acting on an object is it's mass.

False

The name of the astronomer who first publicly stated that earth revolves around the sun in Galileo

False

Compared to its weight on earth a 10kg object on the moon will weigh

Less

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The reason this can be done is that

Milk carton has inertia

You and a friend are jumping on a trampoline. Why does earth which is rapidly orbiting around the sun not move under your feet when you jump?

Newton's first law holds that your body moved along with earth because it is not compelled to change its motion by an unbalanced force

Friction is a force that always acts

Opposite to an objects motion

The astronomer Copernicus publicly stated in the 1500s that Earth

Revolves around the sun

Compared to its mass on earth the mass of a 10 kg object on the moon is

The same

An astronaut has the same mass on earth as in space

True

Friction refers to the force between two surfaces that are sliding past each other

True

In the fourth century B.C., Aristotle divided motion into two types: natural motion and violent motion.

True

Not true about Aristotle

Violent motion is thought to be either straight up or down

The law of inertia states that an object

Will not do any of above

The force required to maintain an object at a constant speed in free space is equal to

Zero