Contact Force

Q. Which among the following are contact forces?

1. Muscular force
2. Electrostatic force
3. Frictional force
4. Gravitational force

Q.

The turning effect of force about a pivot is known as

1. Moment of force

2. Thrust

3. Lateral Pressure

4. Lateral Force

Q. The forces which require physical contact are called non-contact forces.

1. False
2. True

Q.

The contact force and action-at-a-distance force are the same.

1. True
2. False

Q. Moment of force is given by

1. Force $\times$ Perpendicular distance of the force from the pivot
2. Force $\times$ Perpendicular distance of the force from the centre of the object
3. Force + Perpendicular distance of the force from the pivot
4. Force + Perpendicular distance of the force from the centre of the object

Q. Two identical pitch balls are equally charged and suspended by a string from same point.At equilibrium the separation between them is d . if length of the string is L and charged on each ball is q then find mass of the ball

Q.

Define the moment of force.

Q. Which of the following is not an example of a contact Force?

1. Picking up a backpack
2. Earth's gravitational force
3. Pushing a box
4. Halting of a train on applying brakes

Q.

Give two examples each of contact and non-contact force.

Q. Match the situations with the kind of force acting on each of them.

1. Frictional force
2. Magnetic force
3. Muscular force

Q. When a stone is stretched using a slingshot, what effect of force is observed for slingshot?

1. Change in shape
2. Change in mass
3. Change in weight
4. Change in colour

Q.

What is meant by non-contact force?

Q.

Which of the following are contact forces?

1. Muscular force
2. Electrostatic force
3. Frictional force
4. Gravitational force

1. 1, 3 and 4

2. 1 and 3

3. 2, 3 and 4

4. 2 and 4

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

1. Magnetic force
2. Muscular force
3. Electrostatic force
4. Gravitational force