Unit 3-

Forces and Motion

What is force?

Here's our first investigation for force!

Gravity

Gravity a force that pulls things toward Earth. The force of gravity acts between all objects.

Friction

Friction force that resists motion between two bodies in contact. Friction slows things down and can cause them to come to a stop. Friction also creates heat. If you rub your hands together, they get warm because of friction.

Balanced and Unbalanced Forces

When two forces are balanced, there is no movement. To have movement, there must be unbalanced forces.

Newton's Three Laws of Motion

Sir Issac Newton described three laws of motion.

1. An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalance force.

2. Acceleration depends on the net force acting on the object and the mass of the object.

3. For every force, there is an equal and opposite reaction.

Potential and Kinetic Energy

Potential energy is stored energy. A roller coaster at the top of a hill has potential energy

Kinetic energy is energy of motion. A roller coaster moving down the hill has kinetic energy

Study Jams Review of Motion

This Study Jams video is a great review for force and motion!

Report abuse