Unit 4 and Forces

A force is a push or pull. It can be balanced or unbalanced. A balanced force is when two forces are acting upon an object such that the object does not accelerate because force A = to force B. Therefore there is no acceleration among balanced forces, but there can still be velocity. 

On the other hand, an unbalanced force is pretty self-explanatory... but creates an acceleration. Gravity is net (unbalanced) force. 

Inertia is the "want" of an object to stay in its current state of movement or rest.

Inertia makes sense when you think of heavy, bulky items in comparison to light, feathery objects. The heavy objects are harder to move and when they do move, they are difficult to stop once in motion. Light objects are easy to persuade to move and also easy to stop.

For example, if a vending machine were traveling at 10 mph, it would be much more difficult to stop that than something like a tennis ball.