A book lying on a table was pushed, and it moved. What kinds of forces were acting on the book when it was lying on the table and when it moved?

An avocado hangs from a branch of a tree. What kinds of forces are acting on it?

An object is under the action of two forces that balance out each other. The forces are ____.

Vimal had a remote-control toy car, which had separate buttons to control its velocity and direction of motion. He wanted it to be under balanced forces. How should he use the remote for that?
A) He should not start the car or use the remote.
B) He should start the car and then keep on increasing its velocity uniformly
C) He should start the car and make it move in a circular path
D) He should start the car and fix its velocity at a certain value and fix its direction of motion.

• Centripetal acceleration is needed for circular motion. Means there will be net centripetal force also.
• Velocity is increasing means there is acceleration. And hence, there is net force. 

A biker is moving on a circular track. What kind of forces are acting on him?

Pick the odd one out.

Calculate the gravitational force acting on the ball in the figure below

The greater the net force opposite to the direction of motion, the ___ the ____ in the direction of motion.

Find the net force on the car. The various forces associated with the car are given below.

The acceleration of a moving body increases. What could be the reason behind it?
A) Increase in the unbalanced forces
B) Decrease in the unbalanced forces
C) Increase in the balanced forces
D) Increase in the net force
E) Decrease in the net force

A car is moving on a road. What are the forces acting opposite to its direction of motion?
A) Frictional force
B) Force exerted by the engines
C) Air resistance
D) Force exerted by the brakes

A stone dropped from the top of a high-rise building is under the action of ____.

• Air resistance is a type of contact force.
• Gravitational force is a type of non-contact force.

A skydiver is under the action of unbalanced forces when he ____.

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What is the downward force acting on a ball dropped from a height?

A skydiver jumps from a helicopter. What are the forces acting on her?

• The net force and the acceleration on the falling skydiver is upward.
• An upward net force on a downward falling object would cause that object to slow down.
• The skydiver thus slows down.
• As the speed decreases, the amount of air resistance also decreases.

A body moving in a straight line under the action of unbalanced forces moves ____.