Relative Motion

Q.

If there was no friction, what would happen to moving objects

Q. Friction opposes ___motion.

Q.

How to measure motion?

Q.

Friction always opposes ___ motion.

Q.

frictional are always act in direction of motion

Q. The interlocking between the irregularities of two surfaces in contact causes friction.

1. True
2. False

Q. A book is kept on a table. When the table is pushed, it accelerates forward. If the book moves along with the table, what can we say about friction acting on the book?

1. it will feel a rolling frictional force
2. No other frictional force
3. It will feel a sliding frictional force
4. Cannot be said

Q.

If friction is caused due to interlocking of surface irregularities then why does a fan stop when switched off?

Q. A book placed on a table is pushed toward the right. The force of friction will act

1. upwards
2. downwards
3. toward the left
4. toward the right

Q. Frictional force depends on:

1. roughness of the surfaces
2. shape of the surfaces
3. colour of the surfaces
4. area of the surfaces

Q.

A force F is applied to a stationary block as shown below.
What is the direction of frictional force acting on the block?

1. Perpendicular to the direction of applied force.

2. Non-contact force.

3. Opposite to the direction of the applied force.

4. Same direction as that of the applied force.

Q. Question 10
Will force of friction come into play when a rain drop rolls down a glass window pane?

Q.

Friction that exists between two surfaces in contact when there is no relative motion between them is known as ______.

1. sliding friction

2. rolling friction

3. kinetic friction

4. static friction

Q.

How come the priliminary contact forces ( friction and muscular force ) be precisely categorised into the 4 fundamental non - contact forces ?

Q. For a stationary body to move, the minimum force required to overcome the interlocking between the two surfaces in contact is known as __________.

1. stopping friction
2. sliding friction
3. static friction
4. rolling friction

Q. Rahul is applying a force of 20 N on a block. However, he is not able to move it. The frictional force acting on the block is .

1. 0 N
2. 20 N towards left
3. 20 N towards right

Q.

"Friction is a force which always opposes relative motion”. The above statement is

1. True

2. False

Q.

Friction that exists between two surfaces in contact when there is no relative motion between them is known as ______.

1. sliding friction

2. rolling friction

3. kinetic friction

4. static friction

Q. Explain why sliding friction is less than static friction.

Q. When two surfaces in contact are very rough, between the surfaces is the main cause of friction.

1. interlocking
2. plowing effect
3. adhesion

Q. Friction always opposes motion.

1. False
2. True

Q. Amit is riding his SUV. What would be the primary cause of friction between the tyres and the road?

1. Interlocking
2. Adhesion
3. Plowing effect
4. None of these

Q. A force F is applied towards the right to a stationary block. Friction force on the block will act towards the .

1. right
2. left
3. down

Q. Interlocking of the surfaces is the sole cause for friction between two surfaces.

1. True
2. False

Q.

Give two examples that motion is relative.

Q. Statement I: Friction opposes the motion of the surfaces in contact.
Statement II: Friction can happen without contact as well.
Select the correct statement(s).

1. Only statement I is correct.
2. Both the statements are incorrect.
3. Only statement II is correct.
4. Both the statements are correct.

Q. The unit in which frictional force can be measured is:

1. Joule
2. Pascal
3. Watt
4. Newton

Q. Can elevator in metro station produce friction?

Q. A horizontal force of 2 N is applied to a box on a flat surface, and it is still at rest as shown below. The value of static friction is ______ N.

1. 25
2. 20
3. 0
4. 2

Q. If we apply a force towards left on a block kept at rest on the ground, the friction will act

1. upward
2. downward
3. rightward
4. leftward