Concepts of Motion - Aristotle and Galileo

It is the movement or change in location of an object overtime.

It is often described in terms of direction, location and speed.

This describes the motion of the sun, moon and stars, which is in perfect circles.

According to Aristotle, this is the motion on Earth and was thought to be either straight up or straight down.

This is imposed motion. It was the result of forces that pushed or pulled.

What was Galileo's idea regarding motion?

• An object can move freely in the absence of friction.

• An object can move only by applying force.

• Some objects can't move freely in the absence of friction.

• Force is needed to keep an object moving, even without friction.

It is the force that acts between materials that touch as they move past each other.

It is caused by the irregularities in the surfaces of objects that are touching.

The property of a body to resist changes to its state of motion is called ________

It is a type of motion wherein no other external forces aside from gravity influences the acceleration of an object.

For Galileo, if there is no ______________, a feather and brick dropped together would hit the ground at the same time.

In 1971, the famous astronaut David Scott proved Galileo correct in his famous hammer/feather drop experiment on the moon, during the __________ mission.