Question

1. a fireman turns on his hose and is knocked backwards newtons 3rd
2. a soccer ball will not move until a player kicks it newtons 1st
3. more force = more acceleration newtons 2nd
4. it takes less force to push a bike than a motorcycle newtons 2nd
5. objects in motion stays in motion unless acted on by an unbalanced force newtons 2nd
6. for every action there is an equal and opposite reaction newtons 3rd
7. a boy can throw a football farther than his friend because he uses more force newtons 2nd
8. a boy standing up on the bus stumbles forward when the bus suddenly stops newtons 2nd
9. feet push down on the floor and the floor pushes up on your feet as you walk newtons 2nd
10. a fish swimming in water uses its fins to push the water backwards which propels the fish forward newtons 3rd

Explanation:

1. When a fireman turns on the hose, the water rushing out exerts a reaction force pushing him backward - Newton's 3rd law.
2. A soccer ball remains at rest until a force (a kick) acts on it - Newton's 1st law (law of inertia).
3. Force and acceleration are directly proportional (F = ma) - Newton's 2nd law.
4. Less mass (bike) requires less force to move compared to more mass (motorcycle) - Newton's 2nd law (F = ma).
5. An object in motion stays in motion without an unbalanced force - Newton's 1st law (law of inertia), not Newton's 2nd as marked.
6. Action - reaction pairs are equal and opposite - Newton's 3rd law.
7. More force results in more acceleration and thus the ball goes farther - Newton's 2nd law (F = ma).
8. When the bus stops, the boy's body continues moving forward due to inertia - Newton's 1st law (law of inertia), not Newton's 2nd as marked.
9. Feet pushing down and floor pushing up is an action - reaction pair - Newton's 3rd law, not Newton's 2nd as marked.
10. Fish pushing water backward and getting propelled forward is an action - reaction pair - Newton's 3rd law.

Answer:

1. Newton's 3rd law
2. Newton's 1st law
3. Newton's 2nd law
4. Newton's 2nd law
5. Newton's 1st law
6. Newton's 3rd law
7. Newton's 2nd law
8. Newton's 1st law
9. Newton's 3rd law
10. Newton's 3rd law