Question

1. a leaf on a tree starts moving when wind blows on it. how is this an example of newtons first law of motion?

a. the wind exerts no net force on the leaf because it is not a push or a pull.
b. the wind exerts a force on the leaf, causing its motion to change.
c. the leaf stops moving even though the wind continues to blow.

Explanation:

Newton's first law states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by a net external force. Here, the leaf is initially at rest. The wind (external force) acts on it, changing its state from rest (no motion) to motion.

• Option A is wrong because wind is a push (force).
• Option C is wrong as it contradicts the situation described (leaf starts moving when wind blows, not stops when wind continues).
• Option B is correct as the wind (force) causes the leaf's motion to change (from rest to motion), which aligns with Newton's first law.

Answer:

B. The wind exerts a force on the leaf, causing its motion to change.