Question

Frictional force is due to the
a. Interlocking of surfaces at atomic ( or molecular ) level
b. Gravitational force acting on the surface of contact
c. Creation of low pressure areas along the area of contact
d. All of the above
5. The correct order of the three kinds of frictional forces is
1. Static <Sliding <Rolling
2. Static <Rolling <Sliding
2. Sliding < Static <Rolling
4. Rolling Sliding Static
6. A box is placed on a horizontal table. The box is at rest and there is no extern
acting on it. The frictional forcing on it is
a. Towards the right hand side
b. Towards the left hand side
c. Upwards
d. There is no frictional force acting on the box​

Answer 1

Answer:

gravitational force acting on the surface of contact

Answer 2

Answer:

1)Option D- all of the above

2)Option 4)Rolling › Sliding › Static

3)Option d) There is no frictional force acting on the box.