Normal Reaction Force

Q. Consider the following statements:

Statement 1: Friction is caused due to interlocking of irregularities present on the surfaces in contact.
Statement 2: Frictional force increases if the two surfaces are pressed harder.

Which of these statement is correct?

1. Only statement 1 is correct.
2. Only statement 2 is correct.
3. Both the statements are correct.
4. Neither of the statements is correct.

Q. Suppose you want to level a field using a lawn roller. Would you prefer to push or pull it? Why?

1. Pull it to increase the pressing force.
2. Pull it to decrease the pressing force.
3. Push it to decrease the pressing force.
4. Push it to increase the pressing force.

Q. Suppose you want to level a field using a lawn roller. Would you prefer to push or pull it? Why?

1. Push it to increase the pressing force.
2. Pull it to increase the pressing force.
3. Push it to decrease the pressing force.
4. Pull it to decrease the pressing force.

Q. A person is balancing between two walls. Identify the direction of friction at the point of contact

1. 
2. 
3. 
4. 

Q. A person is balancing between two walls. Identify the direction of friction at the point of contact

1. 
2. 
3. 
4.