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 ____.

A biker biking on a circular path is under the action of ___ forces.

• A centripetal force is a force which acts inwards to an object that moves in a circular path.
• This force is also dependent on the object's mass, speed of rotation of the object as well as the distance from the center.
• The unit of centripetal force is newton.
• The centripetal force is always directed perpendicular to the direction of the object's displacement.

A laptop lying on the table is under the action of ___.

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

When a body is under the action of unbalanced forces, it _____.

Two or more forces exerted on an object are balanced if their effects cancel each other, and they do not cause a change in the object's motion.

When a body is under the action of balanced forces, its ___.

When the net force on an object is non-zero, the forces on the object are called ___.

An unbalanced force causes a change in motion, speed, direction, or movements because of unequal force or strength that is applied to one side of an object.

When the net force on an object is zero, the forces on the object are called _____.

Harry makes a list of objects that he generally sees around and categorizes them into two categories, viz., objects under the action of balanced forces and unbalanced forces. Surprisingly, he found out that most objects under the first category are ___ and the second category are ___.

Find the net force on the rope in the situation given below.

The figure below shows two boys hanging from a branch of a tree. The weight of the two boys is equal, i.e., 437 N each. What is the net force that they exert on the branch?