Question

For each statement below, indicate which of Newton's Three Laws the statement represents. (5 points)
Newton's 1st Law Newton's 2nd Law Newton's 3rd Law
A ball rolls directly across the floor until Luis gives it a kick.



Both a bowling ball and a tennis ball roll over your foot at identical speeds, but the force of the bowling ball causes much more pain.



Your riding lawn mower stalls, and as your friends push it, the force helps the lawn mower move until it gradually accelerates.



A firefighter turns on a water hose and is pushed backward by the force.



A soccer ball remains stationary until a player kicks it into motion.

Answer 1

1) A ball rolls directly across the floor until Luis gives it a kick. — Newton's 1st Law
Explanation: An object in motion stays in motion (and at rest stays at rest) unless acted on by a net external force (the kick).

2) Both a bowling ball and a tennis ball roll over your foot at identical speeds, but the force of the bowling ball causes much more pain. — Newton's 2nd Law
Explanation: For the same change in velocity, the heavier ball (greater mass) delivers a larger force/impulse (F = ma, and momentum p = mv).

3) Your riding lawn mower stalls, and as your friends push it, the force helps the lawn mower move until it gradually accelerates. — Newton's 2nd Law
Explanation: The applied force produces acceleration of the mower proportional to the net force and inversely proportional to its mass (F = ma).

4) A firefighter turns on a water hose and is pushed backward by the force. — Newton's 3rd Law
Explanation: The water is pushed out one way and the hose/firefighter is pushed the opposite way — every action has an equal and opposite reaction.

5) A soccer ball remains stationary until a player kicks it into motion. — Newton's 1st Law
Explanation: The ball stays at rest until an external force (the kick) acts on it.