Stored (potential) energy
Grade 8 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
Ari lifts a 2 kg backpack onto a shelf 3 m above the floor. Use PE = m × g × h with g = 10 N/kg. How much stored energy does it gain?
Bo lifts a 4 kg box of books onto a closet shelf 2 m up. Use PE = m × g × h with g = 10 N/kg. How much stored energy does it gain?
A teacher helps Esme raise a 3 kg bucket 5 m with a pulley. Use PE = m × g × h with g = 10 N/kg. How much stored energy does it gain?
Jun puts the same ball on a low shelf (A, 0.5 m) and a high shelf (B, 2 m). Which stores more energy?
- A, since it is easier to reach
- B, the higher shelf
- Neither: a still ball has no energy
Kira holds a skateboard still at the top (P) and middle (Q) of a ramp. Where does it store more energy?
- At P, the higher point
- Neither, since it is held still
- At Q, where it would move faster
Luz has two copies of the same book: one on the floor and one on a desk. Which stores more energy from gravity?
- The one on the desk
- Both store no energy, since both are still
- The floor book, since it could slide fastest
Milo stretches a rubber band and holds it still. What kind of energy does it store?
- Elastic stored energy
- No energy, since it is still
- Motion energy, since it could fly off
- Sound energy
Noah holds a ball above the ground. What kind of energy does the ball store?
- Light energy
- Motion energy
- Gravitational stored energy
- No energy, since it is not falling
Pia holds two magnets a little apart; they pull toward each other. What kind of energy do they store?
- Magnetic stored energy
- Thermal energy
- No energy until they snap together
- Motion energy
Ren drops a ball. Read the bar chart. How much motion energy does it have just before landing?
- 15 J
- 0 J
- 30 J