When the roller coaster is in motion the only thing that stops it is the brakes. When the roller coaster is in motion the only thing that can make it move is an outside force.

Vocab Terms:

Inertia - A property of matter by which it continues in its existing state of rest or uniform motion in a straight line.

Questions:

1. What is the tendency of an object to stay at rest or in motion?

Are balanced or unbalanced forces needed to move something

In this picture the bowling ball will fall faster than the feather because it has a higher mass, making gravity pull on it stronger than the feather.

Vocab Terms:

Mass - The quantity of matter as determined from its weight.

Gravity - The force that attracts a body toward the center of the earth, or toward any other physical body having mass.

Questions:

What is the force of the car with a mass of 200 kg and an acceleration of 20 m/s/s?

How much force will the ball hit the ground at if it's acceleration is 5 m/s/s and it's mass is 10 kg?

The golf club is hitting the golf ball and pushing it forward, the golf ball is pushing against the golf club and pushing it backwards, but because it was stationary and has little mass it only slows the golf club's swing

Vocab terms: Action Force - A forceacting in one direction. 

Reaction Force - A force acting in the opposite direction as the action force.

Questions: How much is the reaction force of a car if the action force is 100 N?

What is the reaction force of an object if it is hit at 53 N?