Energy changes form
Grade 8 Science Worksheet
Circle the best answer, or write your answer on the line.
Bo coasts to the bottom of a long hill. Using the bar chart, how much energy is thermal at the bottom?
Esme's sled is partway down a bumpy slope. Using the bar chart, how much energy is thermal there?
A track has point A (30 m high), B (5 m) and C (18 m). At which point is the cart's motion energy greatest, Jun?
- At C, the middle point
- At B, the lowest point
- The same at each point
- At A, the highest point
On the same track, at which point is the cart's stored energy smallest, Kira?
Use the picture in question 3.
- At B
- At A, where it barely moves
- Stored energy is zero everywhere
- At C
Between B (5 m) and C (18 m), the cart climbs. Which energy change happens, Luz?
Use the picture in question 3.
- Motion → stored
- Stored → motion
- Motion → nothing
- Thermal → stored
Milo pedals a bike up a hill, using energy from breakfast. Which energy change mostly happens on the way up?
- Motion energy → nothing
- Stored energy → chemical energy
- Chemical energy → stored energy
- Thermal energy → chemical energy
Noah coasts down the other side without pedaling and speeds up. Which energy change happens?
- Chemical → stored
- Stored → motion
- Motion is used up
- Motion → stored
At the bottom, Pia brakes to a stop and the rims feel warm. Which energy change happens?
- Thermal → motion
- Motion → nothing
- Motion → thermal
- Stored → chemical
Ren drops a play ball, and each bounce is lower than the last. Where did the missing energy go?
- It was used up by bouncing
- Into thermal energy and sound
- Into stored energy that stays in the floor
- Into making the ball lighter
Zee's toy car rolls across a carpet and slowly stops. Where did its motion energy go?
- The carpet destroyed it
- Into stored energy in the car
- Into thermal energy in the car and carpet
- Back into the batteries
