Our Two Main Concepts

1
Our Two Main Concepts

• Energy
• The capacity to do work
• (the ability to cause change)
• Force
• Anything that causes a mass to accelerate
• Push or pull

2
Transformation of Energy

• Energy is never created or destroyed, but can
  change forms
• A force causes energy to change forms
• i.e. the FORCE of gravity can turn kinetic energy
  into gravitational potential and vice versa
• The force exerted by a spring can convert spring
  potential energy into kinetic energy

3
Types of Energy

• Kinetic movement
• Gravitational potential the stored energy
  caused by having height
• Spring potential the stored energy when a
  spring is stretched or compressed
• Heat least usable form

4
Types of Forces

• Gravity converts GPE to KE or KE to GPE
• Spring converts KE to SPE or SPE to KE
• Friction converts any type of energy into heat

5
Net Forces

• When two forces act on an object can combine or
  cancel each other out
• The net force is the total force, and is in a
  single direction
• A net force causes a mass to accelerate (Fma)
• aF/m

6
Free Body Diagrams

• Are how we monitor all of the forces acting upon
  an object

Net Force is 20N down
7
LOL Graphs

• Are how we monitor changes in the form of energy
  and energy lost as heat (friction)

Before After
8
Concept Map

• Your task for today is to create concept map
• This should show how each of the terms connect
  for example a FORCE causes a MASS to ACCELERATE
• Define the terms in a way that helps you
• i.e. You have GPE whenever you have height
• A spring force is when a spring pushes or pulls
  an object