Question

problem # description/clue newtons law
1 when a bat strikes a ball, the force exerted sends the bat backwards.
2 when hit from behind in a car crash, a person can suffer a neck injury of whiplash.
3 an object at rest will stay at rest if no outside forces are applied.
4 a greater applied force is required to move an object with a greater mass than one with a smaller mass.
5 the unit for force is...
6 in theory, if a baseball and a cannonball are dropped from the same height at the same time, which ball will hit the ground first?
an ice - skater at rest rushes against a sled at rest.

Explanation:

1. When a bat strikes a ball and the bat goes backwards, it's Newton's 3rd Law (action - reaction).
2. Whiplash in a car crash is due to inertia, Newton's 1st Law.
3. An object at rest staying at rest is Newton's 1st Law.
4. Greater force for greater mass is Newton's 2nd Law ($F = ma$).
5. The unit of force is the Newton.
6. In a vacuum, both the baseball and cannon - ball would hit the ground at the same time due to gravity. But if considering air resistance, it's more complex. Assuming no air resistance, they hit at the same time.

Answer:

1. 3rd Law
2. 1st Law
3. 1st Law
4. 2nd Law
5. Newton
6. They hit at the same time (assuming no air resistance)