Year 8 Science - Energy

The law of conservation energy states:

• Energy can be created, but not destroyed

• Energy cannot be created but can be destroyed

• Energy can not be created nor destroyed

Kinetic Energy

• Energy of movement

• Energy that is stored

• Energy that is made

The 'v' in the kinetic energy formula stands for

• Velocity

• Viscosity

• Variance

Potential Energy

• Energy of movement

• Energy that is stored

• Energy that can be destroyed

The 'g' in the potential energy formula is:

• 8.9 m/s

• 19.8 m/s

• 9.8 m/s

An example of potential energy is

• Chemical

• Electrical

• Light

An example of kinetic energy is

• Elastic

• Thermal

• Gravitational

An example of an energy transfer is

• electrical -> sound

• electrical -> chemical

• elastic -> sound

An example of an energy transformation is

• chemical -> nuclear

• electrical -> heat

• gravitational -> kinetic

What is Newton's First Law of Motion

• An object in motion will stay in motion and an object at rest will stay in rest, unless acted on by another force

• Force is equal to the change in momentum per change in time. For constant mass, force equals mass times acceleration

• For every action, there is an equal and opposite reaction