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A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly.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