Forces and Motion Unit Test Study Guide Inertia

Forces and Motion Unit Test Study Guide

Inertia

The two balls will bounce off each other in opposite directions and go back the same speed and the same distance.

More

Friction (opposing force)

Both boys will move backwards at the same speed and distance. (3 rd Law of Motion)

A=9– 4/2 A = 5/2 A = 2. 5 m/s/s

Between 5 – 8 seconds

20 Newtons of Force

Constant Speed Decreasing speed

• Driving 55 mph on cruise control down a highway and then begins to slow down and eventually stops at a stop light.

Static friction – a force which resists to change its state of rest of an object. Rolling friction – a resistive force that opposes the rolling motion of an object. Sliding friction – frictional force which opposes the sliding motion between two contact surfaces.

Inertia is an object’s tendency to resist a change in motion

Object at rest stays at rest or object in motion stays in motion unless a force acts upon it. (Soccer ball is still until it is kicked. )

The greater the mass the greater the amount of force needed to accelerate the object.

For every action there is an equal and opposite reaction.

The golf club pushes on the golf ball and the golf ball pushes back on the golf club.

1 st Law of motion – object stays at rest unless a force acts upon it. The table cloth provides some force but not enough to have the dishes fall off of the table.