Physics 9

Differentiate between rest and motion. With the help of an example, show that rest and motion are relative to an observer.

Rest and motion are two fundamental concepts in the study of mechanics. They are relative terms, meaning their meaning depends on the frame of reference from which they are observed. Rest refers to the state of an object when it does not change its position with respect to its surroundings over time. In simpler terms, … Read more

A 100 g ball is just released (from rest) and another is thrown downward with a velocity of 10 m/s. Which will have greater acceleration? (Neglect air resistance)

When a 100 g ball is released from rest and another is thrown downward with a velocity of 10 m/s, both balls experience the same acceleration due to gravity (9.8 m/s²). This is because the acceleration due to gravity is constant for all objects near Earth’s surface, regardless of their mass or initial velocity. While … Read more

If two stones of 10 kg and 1 kg are dropped from a 1 km high tower, which will hit the ground with greater velocity? Which will hit the ground first? (Neglect air resistance)

When two stones, one of 10 kg and the other of 1 kg, are dropped from a height of 1 km, they will hit the ground with the same velocity, assuming no air resistance. This is because the acceleration due to gravity (9.8 m/s²) acts equally on both stones, regardless of their mass. The difference … Read more

Which controls in the car can produce acceleration or deceleration in it?

The accelerator pedal in a car controls acceleration, increasing the speed of the car. When the pedal is pressed, the car accelerates, causing it to move faster. The brake pedal is used for deceleration, slowing the car down. Pressing the brake causes negative acceleration, reducing the car’s speed. Additionally, the clutch in manual cars and … Read more

Examine the distance-time graph of a motorcyclist (as shown). What does this graph tell us about the speed of the motorcyclist? Also, plot its velocity-time graph.

A distance-time graph for a motorcyclist that forms a straight, sloped line indicates that the motorcyclist is moving at a constant speed. This is because the distance covered increases uniformly with time, meaning there is no change in speed over time. The steeper the slope of the line, the higher the speed of the motorcyclist. … Read more

With the help of daily life examples, describe the situations in which: a. Acceleration is in the direction of motion. b. Acceleration is against the direction of motion. c. Acceleration is zero and the body is in motion.

In daily life, there are several instances of acceleration in different directions. a. Acceleration in the direction of motion occurs when a car accelerates along a straight road, increasing its speed. b. Acceleration against the direction of motion happens when a car brakes to slow down, resulting in negative acceleration. c. Acceleration is zero and … Read more

Can a car moving towards the right have the direction of acceleration towards the left?

Yes, it is possible for a car moving to the right to have acceleration directed to the left. This situation occurs when the car is decelerating, meaning it is slowing down. The car’s velocity is directed to the right, but the acceleration is directed to the left, opposing the motion. This leftward acceleration acts as … Read more

Is it possible to accelerate an object without speeding it up or slowing it down?

Yes, it is possible to accelerate an object without speeding it up or slowing it down. This happens in cases of uniform circular motion. In this type of motion, an object moves in a circular path, and while its speed remains constant, its direction of motion changes continuously. The change in direction requires a centripetal … Read more