Use your book (Chapter 5), notes, or class worksheets to complete this quiz review:

  1. What is energy? Page 109
  2. Can energy by transferred from one object to another? Page 116
  3. What is the definition for potential energy? Page 113
  4. What is the equation for potential energy (PE)? What do each of the letters in the equation stand for? PE = mass x gravity x height
  5. What are the units for potential energy? PE = mgh = (kg) x (m/s2) x (m) = joule (J) or newton-meter (N*m)
  6. What is the definition of kinetic energy (KE)? Page 112
  7. What is the equation for kinetic energy? What do each of the letters in the equation stand for?

KE= ½ mv2 or KE= one half ( ½ ) x mass x velocity squared ( 2 )

  1. What are the units for kinetic energy? Same unit as potential energy
  2. What is the relationship between PE and KE? PE can easily convert into KE and vice versa
  3. What are 5 forms of energy? Starts on page 109
  4. What form of energy are KE and PE? Mechanical energy
  5. Answer the following questions about a cart on a roller coaster.
  6. When does the cart have PE? At the top of a height because “it has the potential to move”
  7. When does the cart have KE? As it is moving down a steep section
  8. What forces are acting on the cart as it moves on the roller coaster? Gravity and friction
  9. If a rollercoaster cart starts at a height of 20 m, can it reach a height on 50 m after it starts? Explain. No it cannot because it does not have enough energy to make it higher than where it started
  10. If a pendulum has KE = 50% total energy, what is the PE? All of the energy can be transferred into PE. Therefore the PE is 50% also.
  11. What is the value and units of g (gravity)? 9.8 m/s2
  1. Calculate the Potential Energy. Include units! Use PE = mgh

m Mass (kg) / g Gravity (m/s2) / h Height (m) / PE Potential Energy
2 kg / 9.8 m/s2 / 20 m / 392 J
10 kg / 9.8 m/s2 / 10 m / 980 J
300 kg / 9.8 m/s2 / 2 m / 5880 J
  1. Calculate the Kinetic Energy. Include units. KE= ½ mv2

m Mass (kg) / v Velocity (m/s) / KE Kinetic Energy
5 kg / 10 m/s / 250 J
22 kg / 2 m/s / 44 J
15 kg / 30 m/s / 225 J

17. What is the difference between renewable and non-renewable energy? A non-renewable energy source is one which, once it is used, cannot be replaced. It is gone forever. Many of the fuels we use today fall into this category – oil, gas, and coal. Once these are burned to heat homes or power cars, their energy is lost forever.
A renewable energy source is one that can be replaced and so is less harmful for the environment. Energy generated by wind turbines or hydroelectric power are renewable – and they can be constantly and instantly replenished. Solar energy is another good renewable energy source.

18.  Answer questions about the following sources of energy: Hydropower, Wind, Geothermal, Coal, Nuclear, Biomass, Solar, Oil. See above paragraphs and graphics below...

  1. Which energy source is renewable?
  2. Which energy source is non-renewable?
  3. Which energy source causes pollution? (hydropower, geothermal, wind, and solar) do not directly emit greenhouse gases)
  4. Which energy source is costly? renewable energy has generally been more expensive to use than fossil fuels. Plus, renewable resources are often located remote areas and it is expensive to build powerlines to the cities where they are needed. The use of renewable sources is also limited by the fact that they are not always available (for example, cloudy days reduce solar energy, calm days mean no wind blows to drive wind turbines, droughts reduce water availability to produce hydroelectricity).
  5. Which energy sources should be used more often? Which energy sources should be avoided? Why?

19.  Plot the amount of energy that is consumed on a pie graph. Use a protractor.

Conversion: 1 % X 3.6 degrees = 3.6 degrees

·  Use a protractor on the circle to fill in the pie chart.

·  Make sure to label the pie chart.

·  Check your math by making sure your degrees add up to 360 degrees

Amount Used (Conversion into degrees) / Amount Used / Energy Source
3.2 x 3.6= 11.52 degrees / 3.2% / Hydro
10.1 x 3.6= / 10.1% / Wind
4.5% / Geothermal
20.2% / Coal
12.4% / Nuclear
1% / Biomass
8.7% / Solar
39.9% / Oil
TOTAL = 360 degrees / TOTAL =
100%