Test: Force & Pressure- 2 - Class 8 MCQ

The force applied on an object in same direction as the object is moving add the speed of the object but when applied in opposite direction, its reduces.

Force is a vector quantity as it contains both direction and magnitude but strength of a force is usually expressed by its magnitude.

Answer:
The correct answer is gravitational force. Here is a detailed explanation:
Gravity and Falling Objects:
- When leaves or fruits fall from trees, they are pulled towards the ground by the force of gravity.
- Gravity is the force that attracts objects towards each other, and it is a fundamental force of nature.
- The Earth has a large mass, which creates a gravitational field around it.
- Any object near the Earth's surface is pulled towards the center of the Earth by this gravitational field.

When force is applied to any object it may change its direction eg.foot ball it may change its shape eg dough it may change its state it may change its motion.

Muscular force enables us to perform all activities involving movement or bending of our body. Muscular force is developed inside muscle due to presence of contractile protein.

When two force acts on opposite direction then the net force will be obtained by subtracting them while if the forces acts in the same direction then the net force will be obtained by adding them.

The forces in which to bodies acting on each other are in contact are called contact force. Muscular force is an example of contact force.

The force resulting due to the action of muscles is known as the muscular force. Muscular force is present in all animals including human beings.

The force responsible for changing the state of motion of objects is called the net force.
Net force is the vector sum of all forces acting on an object. It determines the overall motion of an object, as it can cause acceleration, deceleration, or a change in direction.

Electrostatic force is exerted by charged body on another charged body or uncharged body. Two charged body having same kind of charge repels each other.

Like poles of magnet repels each other while unlike poles of two magnet attract each other.

Friction arises due to contact between two surfaces. Friction force is more in case of solid body and less in case of gases.

A force has both magnitude and direction so, force is a vector quantity. Force can change state and shape of body.

Gravitational force is acting on earth, moon and on all other planet. This force is acting on all the body having some mass.

Force applied on inflated balloon is an example that shows that force can change shape and size of object.

The speed of moving ball increase further if force is applied in direction of motion and decrease if force is applied in opposite direction.

The force exerted by a charged body on another charged or uncharged body is known as electrostatic force. Electrostatic force is non-contact force.

The tendency of a body to maintain its state of rest or uniform motion is called inertia. Mass is the measure of inertia.

Gravitational force is one of the most fundamental forces of nature. It causes objects to attract each other . It is a conservative type of force . The gravitational force is independent of the intervening medium.It is one of the weakest force of the nature.

When a force is applied to a body, it can change the body's state of motion. If the force is applied in the direction of the body's motion, it causes the body to accelerate, meaning the speed of the body increases. This is in accordance with Newton's second law of motion, which states that force equals mass times acceleration (F=ma). Thus, the application of force in the direction of motion leads to acceleration.