Assertion and reason

Exercise and reference answers

Questions

1. Reason

   With little friction, there is almost no external force to slow it.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   A puck slides a long way on smooth ice with no push.

2. Reason

   Both say a body's motion persists unless an external force acts.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Newton's first law is a restatement of Galileo's law of inertia.

3. Reason

   Friction opposes motion in everyday situations.

   Verdict

   The assertion is false and the reason is true.

   Assertion

   A force is required to maintain uniform motion.

Explanation