Energy changes form

Answer Key - Grade 8 Science Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   Ari's coaster chart shows a point partway along the ride. Using the bar chart, how much energy is thermal there?

   100 J
2. 2.

   Bo coasts to the bottom of a long hill. Using the bar chart, how much energy is thermal at the bottom?

   150 J
3. 3.

   Esme's sled is partway down a bumpy slope. Using the bar chart, how much energy is thermal there?

   80 J
4. 4.

   Between B (5 m) and C (18 m), the cart climbs. Which energy change happens, Luz?

   • Motion → stored
   • Stored → motion
   • Thermal → stored
   • Motion → nothing
5. 5.

   Milo pedals a bike up a hill, using energy from breakfast. Which energy change mostly happens on the way up?

   • Stored energy → chemical energy
   • Motion energy → nothing
   • Thermal energy → chemical energy
   • Chemical energy → stored energy
6. 6.

   Noah coasts down the other side without pedaling and speeds up. Which energy change happens?

   • Chemical → stored
   • Motion is used up
   • Motion → stored
   • Stored → motion
7. 7.

   At the bottom, Pia brakes to a stop and the rims feel warm. Which energy change happens?

   • Motion → thermal
   • Motion → nothing
   • Stored → chemical
   • Thermal → motion
8. 8.

   Ren drops a play ball, and each bounce is lower than the last. Where did the missing energy go?

   • Into stored energy that stays in the floor
   • Into making the ball lighter
   • Into thermal energy and sound
   • It was used up by bouncing
9. 9.

   Tala's model pendulum swings a little lower each time. Where does its energy go?

   • It disappears with each swing
   • Into extra height
   • Into thermal energy from rubbing and air
   • Into the clock's numbers
10. 10.

    Zee's toy car rolls across a carpet and slowly stops. Where did its motion energy go?

    • Into thermal energy in the car and carpet
    • Into stored energy in the car
    • Back into the batteries
    • The carpet destroyed it