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?
- The same at each point
- At B, the lowest point
- At A, the highest point
- At C, the middle point
On the same track, at which point is the cart's stored energy smallest, Kira?
Use the picture in question 3.
- Stored energy is zero everywhere
- At C
- At A, where it barely moves
- At B
Between B (5 m) and C (18 m), the cart climbs. Which energy change happens, Luz?
Use the picture in question 3.
- Thermal → stored
- Motion → nothing
- Motion → stored
- Stored → motion
Noah coasts down the other side without pedaling and speeds up. Which energy change happens?
- Stored → motion
- Chemical → stored
- Motion → stored
- Motion is used up
At the bottom, Pia brakes to a stop and the rims feel warm. Which energy change happens?
- Stored → chemical
- Motion → nothing
- Thermal → motion
- Motion → thermal
Ren drops a play ball, and each bounce is lower than the last. Where did the missing energy go?
- Into making the ball lighter
- Into stored energy that stays in the floor
- It was used up by bouncing
- Into thermal energy and sound
Tala's model pendulum swings a little lower each time. Where does its energy go?
- Into extra height
- Into thermal energy from rubbing and air
- Into the clock's numbers
- It disappears with each swing
Zee's toy car rolls across a carpet and slowly stops. Where did its motion energy go?
- Back into the batteries
- The carpet destroyed it
- Into thermal energy in the car and carpet
- Into stored energy in the car