Question

1. when something moves fast, it has energy

a. low b. no c. high d. tiny
part b - medium (applying & analyzing)

1. you drop two balls, one big and one small. which one has more potential energy?

a. the big ball b. the small ball c. both the same d. neither

1. you lift a rock higher. what happens to its potential energy?

a. goes down b. goes up c. stays the same d. disappears

1. you roll a ball faster. what happens to its kinetic energy?

a. it grows b. it stops c. it sleeps d. it disappears

1. when a ball hits the ground, energy is

a. created b. changed c. lost d. eaten

1. you drop a marble from a tall chair and a short chair. which makes a deeper mark in

clay?
a. the tall one b. the short one c. both same d. none

1. when a swing goes up, it has more energy

a. kinetic b. potential c. sound d. light

1. when the swing goes down, it has more energy

a. sound b. potential c. kinetic d. color

1. a snowball rolling down a hill shows energy

a. stored b. kinetic c. sound d. heat

1. you push a toy car gently. it moves slowly. you push harder - it moves fast. what

changed?
a. its shape b. its energy c. its color d. its name

1. a ball on a high shelf and a ball on the floor - which has more stored energy?

a. the shelf ball b. the floor ball c. both same d. neither

1. when you catch a moving ball, what happens to its energy?

a. it goes into your hands b. it disappears c. it flies away d. it changes color

1. if a marble is heavy, it has potential energy than a light one at the same

height.
a. less b. more c. none d. equal

1. a child runs faster than another. who has more kinetic energy?

a. the slower child b. the faster child c. both same d. none

1. you hold a ball high, then drop it. what happens first?

a. it gains kinetic energy b. it stops c. it flies up d. it disappears

1. when you climb up stairs, your energy increases

a. kinetic b. potential c. sound d. heat

1. when a ball bounces back up, it changes

a. direction b. shape c. name d. color

1. a roller coaster at the top of a hill has a lot of energy

a. potential b. sound c. light d. air

1. when it moves down the hill, the energy becomes

a. potential b. kinetic c. light d. sound

1. a rock sitting on a mountain has energy waiting to move.

a. potential b. kinetic c. sound d. color

1. when it falls, the rocks energy changes from to

a. potential to kinetic b. kinetic to light c. sound to heat d. none to some

Explanation:

1. Potential energy is related to mass and height. When dropped from the same height, the big ball has more mass, so more potential energy.
2. The formula for gravitational potential energy is \(U = mgh\) (where \(m\) is mass, \(g\) is gravitational acceleration, \(h\) is height). Lifting a rock higher (\(h\) increases), so potential energy goes up.
3. Kinetic energy formula is \(K=\frac{1}{2}mv^{2}\) (\(m\) is mass, \(v\) is velocity). Rolling a ball faster (\(v\) increases), so kinetic energy grows.
4. When a ball hits the ground, energy is conserved but changes form (e.g., from kinetic to elastic and thermal), so it is changed.
5. The marble from the tall chair has more potential energy (higher \(h\) in \(U = mgh\)), so makes a deeper mark.
6. When a swing goes up, height (\(h\)) increases, so potential energy (related to \(h\) in \(U = mgh\)) increases.
7. When a swing goes down, velocity (\(v\)) increases (kinetic energy \(K=\frac{1}{2}mv^{2}\) depends on \(v\)), so kinetic energy increases.
8. A snowball rolling down a hill is in motion (has velocity \(v\)), so shows kinetic energy (\(K=\frac{1}{2}mv^{2}\)).
9. Pushing harder makes the toy car move faster (velocity \(v\) changes), so its energy (kinetic energy \(K=\frac{1}{2}mv^{2}\) as \(v\) changes) changes.
10. A ball on a high shelf has higher \(h\) in \(U = mgh\), so more stored (potential) energy.
11. When you catch a moving ball, its energy is transferred (e.g., to your hands as thermal and elastic energy), so it goes into your hands.
12. Using \(U = mgh\), at the same \(h\), a heavier (more \(m\)) marble has more potential energy.
13. Kinetic energy \(K=\frac{1}{2}mv^{2}\), faster (\(v\) is larger) child has more kinetic energy (assuming similar mass).
14. When you drop a ball, first it starts to move (gain velocity \(v\)), so gains kinetic energy (\(K=\frac{1}{2}mv^{2}\)).
15. Climbing stairs increases height (\(h\)), so potential energy (\(U = mgh\)) increases.
16. When a ball bounces back up, its direction of motion changes.
17. A roller - coaster at the top of a hill has high \(h\), so a lot of potential energy (\(U = mgh\)).
18. Moving down the hill, velocity (\(v\)) increases, so energy becomes kinetic (\(K=\frac{1}{2}mv^{2}\)).
19. A rock sitting on a mountain has potential energy (due to height \(h\) in \(U = mgh\)) waiting to move.
20. A falling rock: initially has potential energy (due to \(h\)), then as it falls, \(v\) increases, so changes from potential to kinetic.

Answer:

1. A. The big ball
2. B. Goes up
3. A. It grows
4. B. changed
5. A. The tall one
6. B. potential
7. C. kinetic
8. B. kinetic
9. B. Its energy
10. A. The shelf ball
11. A. It goes into your hands
12. B. more
13. B. The faster child
14. A. It gains kinetic energy
15. B. potential
16. A. direction
17. A. potential
18. B. kinetic
19. A. potential
20. A. potential to kinetic