Energy review quiz

What is energy?

• the ability to produce electricity

• the ability to do work

• the ability to move with a constant velocity

• the ability to convert energy

Answer explanation

correct -- the amount of work you can do

Energy is the ability to do work -- then how can work be described?

• "Stuff has to happen for work being done" -- Energy is transferred

• "The amount of stuff that could potentially happen" -- Energy is saved

• "Electricity has to be transferred for work being done" -- Energy is transferred

• "The amount of money that is spent" -- Money is transferred

Answer explanation

Correct -- Work is a measure of energy transfer that occurs when an object is moved over a distance by an external force

How can we detect energy?

• We can easily see it.

• The only way is to use a thermometer

• The only way is to measure the electricity

• It can only be detected when a change occurs.

Heat, or Thermal Energy, is actually a form of:

• Chemical Energy

• Nuclear Energy

• Mechanical Energy

• Radiant Energy

Answer explanation

Indeed -- heat is like a radio wave but with higher energy

What is the formula for kinetic energy?

•  $m\ \times\ h\ \times\ 9.8$  

•  $\frac{1}{2}m\times v\times v$  

•  $\frac{1}{2}m\ \times\ h\ \times\ v$  

•  $\oint_0^{\infty}\ m\ \times\ g\ \times h\ dh$  

Kinetic energy is ...

• motion energy

• stored energy

• pressure energy

• nuclear energy

The kinetic energy of an object depends on its ...

(hint -- what is the formula for kinetic energy?)

• mass and height

• velocity and position

• height and gravity

• mass and velocity

When you ride up a hill with your bike, your greatest potential energy is ...

• at the bottom, when you are the fastest

• at the top, when you are the highest

• trick question -- there is no potential energy with a bike

• on either side of the hill, mid-way

When you wind up a spring, you have ...

• stored kinetic energy

• stored potential energy

• stored thermal energy

• stored chemical energy

Look at the graph -- which material was the worst insulator? (could not trap the heat effectively)

• Aluminium foil

• Cotton wool

• Bubble wrap

• Not enough information

Answer explanation

Correct -- surprisingly, aluminium did really poor and dropped the most in temperature