Question

1. an object at rest will ______ at rest until a force acts on it.

• always
• never
• sometimes
• occasionally

1. casually, we can refer to a force as a ______.

• dynamic event
• sudden movement
• push or pull
• underdeveloped energy transfer

1. the more mass an object has, the ______ force is required to move it.

• less
• more
• smaller the
• underdeveloped

Explanation:

1. According to Newton's first - law of motion, an object at rest will remain at rest until a force acts on it. So the answer is "always".
2. Casually, a force is defined as a push or pull. This is the basic and common - sense understanding of force.
3. According to Newton's second law ($F = ma$), the more mass an object has, the more force is required to move it.

Answer:

1. A. always
2. C. push or pull
3. B. more