Newton`s Laws

Which of Newton's laws best explains why motorists should buckle-up? <br />

• the first law
• the second law
• the third law
• the law of gravitation

In the absence of an external force, a moving object will

• stop immediately.
• slow down and eventually come to a stop.
• go faster and faster.
• move with constant velocity.<br />

When you sit on a chair, the resultant force on you is<br />

• zero
• up
• down
• depending on your weight

A net force F accelerates a mass m with an acceleration a. If the same net force is applied to mass 2m, then the acceleration will be

• 4a
• 2a
• a/2
• a/4