Which of the following illustrates Newton's third law of motion ?

Options

A. (a)When a bus suddenly, the passengers receive a backward jerk .
B. (b)While catching a fast - moving cricket ball, the fielder gradually pulls his hand backwards with the moving ball .
C. (c)The launching of a rocket .
D. (d)When we stop pedalling, the bicycle slow down .

Answer

To determine which of the given options illustrates Newton's third law of motion, we need to analyze each statement based on the law itself. Newton's third law states that for every action, there is an equal and opposite reaction.

### Step-by-Step Solution:

1. **Understanding Newton's Third Law:**
- Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that forces always occur in pairs.

2. **Analyzing the Options:**
- **Option 1:** When a bus suddenly stops, the passenger receives a backward jerk.
- **Analysis:** This scenario illustrates inertia (Newton's first law), as the passenger continues to move forward when the bus stops suddenly.
- **Option 2:** While catching a fast-moving cricket ball, the fielder gradually pulls his hand backward with the moving ball.
- **Analysis:** This is an application of Newton's second law, as the fielder is applying a force to change the momentum of the ball.
- **Option 3:** Launching of a rocket.
- **Analysis:** When a rocket launches, it expels gases downward, and as a reaction, it moves upward. This perfectly illustrates Newton's third law.
- **Option 4:** When we stop pedaling, the bicycle slows down.
- **Analysis:** This scenario is related to friction and does not illustrate Newton's third law.

3. **Conclusion:**
- The correct option that illustrates Newton's third law of motion is **Option 3: Launching of a rocket**.