Balanced and Unbalanced Forces

Q. If an object is not moving, then there are no forces acting on it.

1. False
2. True

Q. Four similar boxes are labelled I, II, III, and IV. The masses of I and III are equal and the masses of II and IV are equal. The mass of box I is smaller than that of box II. Boxes I and II are placed in a grass field and boxes III and IV are placed on a marble floor. Which box requires the maximum force to be moved?

1. I
2. II
3. III
4. IV

Q. If a body is at rest, it means no force is acting on it.

1. True
2. False

Q.

What is the net force if two forces are acting in opposite directions on an object ?

Q.

Define balanced and unbalanced forces

Q.

Give two examples each where force

1 ) Only tends to stop motion

2 )Changes the direction of motion

3) Changes the shape of body

Q.

A body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3 N, find the magnitude of the contact force.

Q. forces can change the of an object.

1. Balanced
2. Unbalanced
3. speed
4. mass

Q.

What are balanced and unbalanced forces? Explain each with two examples.

Q. If the net force acting on a body is , then the forces are said to be .

1. conserved
2. non-zero
3. zero
4. balanced

Q.

In the tug-of-war match, the rope does not move to either side although it is pulled by the two team. What can you say about the resultant force? What should be done by anyone of the two team to win the match?

Q.

Give some effects that can be produced by a force

Q. In the given figure, a boy is pushing the box towards right. Frictional force on the box will act ___.

1. towards right
2. towards left
3. vertically downwards
4. vertically upwards

Q.

Answer the following:

In a tug of war match, two teams exert equal forces on the rope. Is there any net force acting on the rope?

Q. Match the net force with the correct forces applied on the block.

1. Net force is zero
2. Net force acts towards left
3. Net force acts towards right

Q. If a game of tug-of-war ends in a draw, then there was no net unbalanced force.

1. True
2. False

Q. Choose the correct increasing order of magnitude for different types of friction.

1. Static, sliding, rolling
2. Rolling, sliding, static
3. Static, rolling, sliding
4. Rolling, static, sliding

Q. How does thrust and the nature of surfaces affect friction? Explain.

Q. A box is resting on the floor. To move it, a variable force is applied. A forceF is applied it does not moves. Again a force 2F is applied it does not moves.At last a force 3F is applied then it moves. What is the value of the limiting friction

Q. In the given figure, a boy is pulling a box towards the left. Thus, frictional force on the box will act

1. towards the left
2. towards the right
3. vertically downwards

Q. Which of the following is an example of muscular force?

1. A person lifting a bucket
2. Earth revolving around the sun
3. Charges attracting each other
4. A magnet attracting iron filings

Q. To move a stationary object, ____ must act on it.

1. an external balanced force
2. an external unbalanced force
3. an internal balanced force
4. an internal unbalanced force

Q. When an object doesn't change its position with respect to its surroundings and time, it is said to be at rest.

1. False
2. True

Q. if an object experience a net zero unbalanced force, then the body

1. can be accelerated
2. moves with constant velocity
3. cannot remain at rest
4. None of these

Q. If the block kept on the table is pushed as shown, what will be the direction of the frictional force acting on the block?

1. Upwards
2. Downwards
3. Opposite to the direction of force applied
4. In the same direction as the force applied

Q. If the block kept on the table is pushed as shown, what will be the direction of the frictional force acting on the block?

1. Downwards
2. Upwards
3. Rightwards
4. Leftwards

Q. Can somebody explain me this. If a body(for eg ball) is moving with constant velocity, and if i apply to opposite forces on it such that they are balanced forces, will the body stop moving, or will there be an increase or decrease in magnitude of velocity, or there will be no change at all. I am not able to visualise what will happen in such a case

Q. Does a force acting on a body always cause a change in its state of motion?

Q. If the block kept on the table is pushed as shown, what will be the direction of the frictional force acting on the block?

1. Upwards
2. Downwards
3. Opposite to the direction of force applied
4. In the same direction as the force applied

Q. Identify the case in which the static friction is acting.

1. 
2. 
3.