Distinguish between balanced forces and unbalanced forces with examples.

A horizontal force $‘F’$is applied to keep the block stationary on a frictionless inclined plane. Find the angle of incline, for which the applied force is equal to the weight of body: 

$1 \mathrm{kg} \mathrm{f} =$ _____ $\mathrm{N}$

(Choose from: $98 / 9.8 / 49 / 4.9$)

$\mathrm{kg}-\mathrm{wt}$ is a unit of force.

A person is holding a briefcase. Draw the force acting on the briefcase when the briefcase is at rest.

Discuss two effects a force can produce.

What is a resultant force?

What causes acceleration?

It is difficult to balance our body when we accidentally slip on a peel of banana. Explain why? 

Is force a scalar quantity? Why?

What are balanced and unbalanced forces?

Define a contact force.

Give an example of non-contact force.

Define force.