State of Motion

Q. When two forces act in the opposite directions, the net force is the difference between them.

1. True
2. False

Q.

When we hit the ground with a ball, why does the ball bounce back again?

Q.

Define 'state of motion' of an object. Name the 'agent' which can change the state of motion of an object.

Q.

How are the states of rest and motion relative?

Q.

You are walking towards the Indian gate. Is the Indian gate at rest with respect to you or is it moving with respect to you?

Q. If F1 and F2 are two forces acting on the block, find the net force on the block.

1. F1 + F2
2. F1 - F2
3. F1 x F2
4. F1 / F2

Q. Why do plastic bottles sometimes get crushed during the landing of an aeroplane?

1. An aeroplane has more pressure at higher altitudes than that on the ground.
2. An aeroplane has less pressure at higher altitudes than that on the ground.
3. An aeroplane has a high temperature at higher altitudes than that on the ground.
4. An aeroplane has a low temperature at higher altitudes than that on the ground.

Q. When two forces act in the same direction, the net force is their addition.

1. True
2. False

Q. When a ball is thrown upwards, then its speed until it reaches the maximum height.

1. increases
2. remains the same
3. decreases

Q.

Describe the experiment of Galileo and what conclusion can be drawn from that experiment.

Q.

What kind of force causes a change in motion?

1. Balanced force

2. Nite force

3. Unbalanced force

4. Knit force

Q. Two blocks A and B kept on smooth horizontal surface are acted upon by few forces as shown. Initially block A is moving towards right with constant speed and block B is at rest. After the application of forces on both as shown. What will happen ?

1. A comes to rest and B starts moving towards right
2. A keeps moving towards right and B remains at rest
3. A moves towards left and B towards right
4. Both A and B moves towards right

Q.

What is the cause of rotational motion?

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. can balanced forces bring about a change in the shape of an object?

Q.

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

1. True

2. False

Q. Question 1
Give two examples each of situations in which you push or pull to change the state of motion of objects.

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. 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.

Question 25
An archer shoots an arrow in the air horizontally. However, after moving some distance, the arrow falls to the ground. Name the initial force that sets the arrow in motion. Explain why the arrow ultimately falls down.

Q.

What is nuclear force

Q.

The concept of rest or motion is relative.

1. True

2. False

Q.

A goalkeeper in a game of football pulls his hand backward after holding the ball shot at the goal. This enables the goal keeper to

1. Exert larger force on the ball

2. Reduce the force exerted by the balls on hand

3. Increase the rate of change of momentum

4. Increase the total change in momentum

Q. Question 11

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

Q. Find the net force acting on the given helicopter.

1. 
   2 N in direction A
   
2. 
   3 N in direction A
   
3. 
   2 N in direction C
4. 
   3 N in direction C

Q.

A constant force of 100 Newton acts on a body for changing its momentum. The change of momentum of the body is ___________newton second

Q.

The motion of an object is a relative term.

1. False

2. True

Q. A pair of equal and opposite forces acting on a body is called:

1. Couple
2. kilopound
3. Pivot force
4. Dynamo

Q. Assertion (A): Mountaineers usually suffer from nose-bleeding at high altitudes. Reason (R): Atmospheric Pressure decreases with altitude.

1. Both (A) and (R) are true and (R) is correct explanation of (A).
2. (A) is true but (R) is false.
3. Both (A) and (R) are true and (R) is not correct explanation of (A).
4. (A) is false but (R) is true.

Q.

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

1. False

2. True