State of Motion

Q.

A girl is pushing a box in the east direction. In which direction should her friend push the box so that it moves faster in the same direction?

Q.

Give one example each to indicate that the application of a force

1. produces motion
2. stops motion
3. slows down motion
4. changes the direction of motion
5. deforms a body

Q.

Which of the following object is in motion with respect to you if you are sitting in a moving train?

1. Seats in the train

2. Light bulb of the train

3. Windows of the train

4. Trees outside the train

Q.

Observation 1: Try to stop a ball coming towards you, so as to save a boundary, by applying a force of some magnitude in the opposite direction of the motion of the ball.

Observation 2: In this case apply the force of the same magnitude but in the same direction of the motion of the ball.

In observation 1 boy saves a boundary by applying a force opposite to the direction of motion but in observation 2, the change in direction of force cost the team 4 runs as the change in direction of force pushed the ball further to the boundary. So, the change in the effect of a force can be experienced by a change in its direction as well as magnitude.

The above statement is:-

Q. In which of the following case(s) can we say that the object is in motion?

1. Only if the object moves toward with respect to the observer.
2. If the object changes its position with respect to the observer.
3. Only if the object moves away with respect to the observer.
4. If the object doesn't change its position with respect to the observer.

Q. State whether given statement is True or False.
A body is said to be at rest if it does not change its position with respect to the reference point.

1. True
2. False

Q. A car is at rest with respect to a tree. The net force acting on the car is non-zero.

1. True

2. False

Q.

Observation 1: Try to stop a ball coming towards you, so as to save a boundary, by applying a force of some magnitude in the opposite direction of the motion of the ball.

Observation 2: In this case apply the force of the same magnitude but in the same direction of the motion of the ball.

In observation 1, the boy saves a boundary by applying a force opposite to the direction of motion, but in observation 2, the change in direction of force cost the team 4 runs as the change in direction of force pushed the ball further to the boundary.

So, the change in the effect of a force can be experienced by a change in its direction as well as magnitude. The above statement is:-

1. True

2. False

Q. A force applied on a body always bring a change in its state of motion.

1. True
2. False

Q.

If the net force on an object is acting in the direction of its motion, its speed decreases.

1. True

2. False

Q. When can you say that the state of motion of an object has changed?

1. There is a change in the speed of the object.
2. There is a change in the direction of motion of the object.
3. There is no change in the speed of the object.
4. There is no change in the direction of motion of the object.

Q. Which of the following is in motion with respect to a person sitting in a moving train?

1. Seats of the train
2. Light bulb of the train
3. Windows of the train
4. Trees outside the train

Q.

A block kept at rest on a horizontal table is pushed by two horizontal forces, one towards north and other towards south, which are equal in magnitude. What can be said about the motion of the block?

1. The block will remain stationary.
2. The block will move upwards.
3. The block will move towards east.
4. The block will move towards west.

Q. Harshit is sitting inside a stationary bus. Which of the following objects will appear to be moving with respect to him?

1. The road on which bus stands
2. Another passing bus
3. Seats of the bus
4. Fellow passengers

Q. Harshit is sitting inside a stationary bus. Which of the following objects will appear to be moving with respect to him?

1. The road on which bus stands
2. Fellow passengers
3. Another passing bus
4. Seats of the bus

Q. Two opposite ends of a cart are attached to two horses respectively. The two horses pull the cart in opposite directions, but it is observed that the position of the cart does not change. What can be the possible explanation?

1. The net force acting on the cart is zero.
2. The net force acting on the cart is positive.
3. The direction of the net force acting on the cart is in the vertical direction.
4. The net force acting on the cart is negative.

Q. In what direction a force should be applied to stop a block moving towards east?

1. West
2. East
3. North
4. South

Q.

Which of the following statements are correct?

1. Atmospheric pressure increases with increase in altitude

2. Atmospheric pressure remains constant with increase or decrease in altitude

3. Atmospheric pressure does not depend on altitude

4. Atmospheric pressure decreases with increase in altitude

Q. When seen from the ground, an apple falling from a tree is under______motion.

1. circular

2. oscillatory

3. rectilinear

4. periodic

Q. When seen from the ground, an apple falling from a tree is under______motion.

1. rectilinear

2. periodic

3. oscillatory

4. circular

Q. When a hockey player strikes a moving ball in the direction of its motion, the speed of the ball _______.

1. remains same
2. becomes zero
3. increases
4. decreases