Question

Q1). A box of mass M sits without slipping on the back of a truck that is moving

to the right but is slowing down. The force of friction on the box a) points to the right and is equal to , F

b), points to the right but is not necessarily equal to F

C). points to the left and is equal to , FN

d. points to the left but is not necessarily equal to , Fy

Answer 1

Explanation:

At some point, the magnitude of the applied force is greater than the force of kinetic friction, and the block moves to the right. This is shown in the .

Answer 2

Answer:

Option D is the right choice.

Explanation:

Since the truck is moving towards right and slowing down which means truck is accelerating towards left.

So, the box over it will experience a pseudo force in the direction opposite to acceleration of truck i.e. towards right.

As the truck is in rest,

To balance the pseudo force friction acts in the direction opposite to it i.e. towards left.

Since there is no information about how the truck is slowing so, Force may not necessarily be constant.

Hence, Friction is acting towards left but is not necessarily equal to F.