Question

In shot-put, a player applies more force and tosses the shot-put at the correct angle has a greater displacement of shot-put, whereas a player who exerts less force has a lesser displacement. Which law applies in this example?

• A. Law of Inertia
• B. Law of Reaction
• C. Law of Momentum
• D. Law of Gravity

Hint:

Force decides how much the motion changes. Think of Newton's second law.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Newton gave three laws of motion: inertia, acceleration (momentum) and action-reaction. We must pick the law that links force to the resulting motion.

Step 2: Key Approach:
Newton's second law (Law of Acceleration or Law of Momentum) says the rate of change of momentum is proportional to the applied force. More force gives more acceleration.

Step 3: Apply to shot-put:
A bigger force on the shot gives it a bigger speed at release. A bigger speed at the right angle means a longer throw. A smaller force gives a shorter throw. This is the second law.

Step 4: Check option (1):
Law of Inertia says a body stays at rest or in motion unless a force acts. It does not compare force sizes. So (1) is wrong.

Step 5: Check option (2):
Law of Reaction says every action has an equal and opposite reaction. It is not about force and displacement. So (2) is wrong.

Step 6: Check option (4):
Gravity pulls the shot down in every throw. It does not explain the difference between strong and weak throws. So (4) is wrong.

Final Answer:
The example shows Newton's second law, given here as the Law of Momentum. This is option (3). \[ \boxed{\text{Law of Momentum}} \]