Physics 9

How would you use Newton’s third law of motion and the law of conservation of momentum to explain the motion of a rocket?

Newton’s third law states that for every action, there is an equal and opposite reaction. The rocket expels gases downward with great force (action), and in reaction, the rocket moves upward. The law of conservation of momentum ensures that the total momentum of the system remains constant, causing continuous acceleration of the rocket. Related Questions: … Read more

A man slips on an oily floor; he wants to move out of this area. He is alone. He throws his bag to move out of this slippery area. Why is it so?

When he throws the bag, an equal and opposite reaction force pushes him in the opposite direction, helping him move out of the slippery area. This is an application of Newton’s third law of motion. Related Questions: When a motorcyclist hits a stationary car, he may fly off the motorcycle, and the driver in the … Read more

Action and reaction are equal but opposite in direction. These forces always act in pairs. Do they balance each other? Can bodies move under an action-reaction pair?

Action and reaction forces act on different bodies, so they do not cancel each other out. Since they act on separate objects, they can cause motion, as seen when a swimmer pushes water backward and moves forward. Related Questions: When a motorcyclist hits a stationary car, he may fly off the motorcycle, and the driver … Read more

Why is it not safe to apply brakes only on the front wheel of a bicycle?

Applying brakes only on the front wheel causes a sudden stop, while the rider’s inertia keeps them moving forward, increasing the risk of being thrown over the handlebars. It is safer to apply brakes on both wheels for balanced stopping. Related Questions: When a motorcyclist hits a stationary car, he may fly off the motorcycle, … Read more

When a motorcyclist hits a stationary car, he may fly off the motorcycle, and the driver in the car may get a neck injury. Explain.

When the motorcycle stops suddenly due to the collision, the motorcyclist continues moving forward due to inertia, causing him to fly off. Similarly, the car driver’s head snaps backward or forward because their body is attached to the seat, but their head remains in motion, leading to whiplash injuries. Related Questions: In autumn, when you … Read more