Question

1. what is the relationship between potential energy and ki explained in the text?

a. potential energy is always greater than kinetic energy.
b. kinetic energy is converted from potential energy when th downhill.
c. potential energy can appear out of nowhere.
d. kinetic energy is stored in the snowboarder’s muscles.

1. according to the text, what role does gravity play in the mot snowboarder?

a. gravity prevents the snowboarder from gaining speed.
b. gravity is irrelevant to the snowboarder’s speed.
c. gravity only affects snowboarders when they are at rest.
d. gravity transfers potential energy to the snowboarder, allowin speed

Explanation:

Question 1

• Option A: Potential and kinetic energy can vary; one isn't always greater. Eliminate A.
• Option B: When moving downhill (e.g., snowboarding), potential energy (from height) converts to kinetic energy (motion). This matches energy conversion principles.
• Option C: Energy can't appear out of nowhere (violates conservation of energy). Eliminate C.
• Option D: Kinetic energy is motion energy, not stored in muscles (muscles store chemical potential energy). Eliminate D.

• Option A: Gravity causes acceleration downhill, so it helps gain speed, not prevent. Eliminate A.
• Option B: Gravity is key for downhill motion (affects speed via acceleration). Eliminate B.
• Option C: Gravity acts on moving objects too (e.g., snowboarder moving downhill). Eliminate C.
• Option D: Gravity pulls the snowboarder, converting potential energy (from height) to kinetic energy (speed), so it transfers energy for speed. This is consistent with physics principles.

Answer:

B. Kinetic energy is converted from potential energy when the (object moves) downhill.

Question 2