Y8 Physics Energy Quiz

Energy efficiency

• Measure of the useful energy

• Measure of the wasted energy

• Kinetic energy

• Potential energy

Kinetic energy.

• Total energy

• Movement

• Stationary

• Gravity

Thermal energy.

• Moving

• Weather

• Cold

• Heat

Potential energy.

• Spring compressed

• Object held at a height

• Conservation of energy law

• Potential + kinetic energy

Energy efficient lightbulbs (compared to a standard lightbulb).

• Use more energy

• Use less energy

• Use the same energy overall

• Take longer to light up but use more electricity

Efficiency equals

• Useful energy produced/energy input

• Useful energy produced/energy input x 100

• Useful energy produced/energy input divided by 100

• work

A kilojoule is 1000 Joules

• True

• False

• No, it's a kilogram of Joules

• No, it's James Joules' fault

An orange is 500 Joules, a pear 1000 Joules and a toffee apple 1500 Joules. If Bindi ate all 3 for lunch how many kilojoules would she have eaten in total?

• 3000

• 30

• 3

• 300

At the top of a rollercoaster the gravitational potential energy is at its maximum.

• True

• False

• No, total energy is zero

• Depends on the height

At the top of a rollercoaster a stationary cart has its kinetic energy at its minimum.

• False

• True