Law of Motion

Performance task: Laws Of motion

Application of the Laws of Motion in our everyday life.

Newton's first law of motion

Newton’s first law of motion states that ” A body continues its state of rest or of uniform motion in a straight line provided no net force acts on it. Newton’s 1st law of motion deals with the inertial property of matter, therefore , newton’s 1st law of motion is known as the law of inertia. Inertia is the tendency of an object to resist the change in its state of rest or uniform motion in a straight line”. Therefore the first law of motion is also known as the law of inertia.

Washing Machine Dryer

A washing machine dryer entirely works upon the principle of the law of inertia. To dry the clothes, the drum of the washing machine dryer is subjected to motion, which further causes the clothes to move; however, the water molecules contained in the cloth do not follow the motion and stay at their position of rest. Due to the gravitational pull of the earth, the water gets collected at the base of the drum. The holes of the drum let the water out, leaving the clothes dry.

Dusting a Carpet

To remove the dust particles from a carpet, you can shake it off or flick it off the carpet repeatedly. This induces motion in the carpet, whereas the dust particles continue to maintain their state of rest. When the carpet moves back, the dust particles get carried away with air or fall to the ground due to gravity, thereby demonstrating the law of inertia.

Newton's second law of motion

Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.

Object thrown from a Height

When an object is thrown from a certain height, the gravitational pull of the earth helps it to develop acceleration. The acceleration increases as the object advanced towards the earth. According to Newton’s second law of motion, the acceleration developed by a body is directly proportional to the force. When the object hits the ground, the impact force comes into action.

Carrying a bucket while walking

Carrying an empty bucket while walking is easier than carrying a loaded bucket while walking. This is because of the relation between the mass of the object, the force applied to it, and the acceleration produced. Since mass has an inverse relationship with acceleration, the loaded bucket tends to move at a slower pace than the empty bucket.

Newton's Third law of motion

Newton’s third law states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction. The third law is also known as the law of action and reaction. "For every action, there is an equal and opposite reaction." The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. Forces always come in pairs - equal and opposite action-reaction force pairs

Clothesline

The clothesline where clothes are hung is another example of Newton’s third law. While the clothes force down, the rope, in reaction, forces up. This ensures that the clothing does not come into contact with the ground.

Throwing an object upward

When we throw an object upward, force of gravity is applied by the earth on the object. the object follows the projectile motion and accelerates towards the earth due to the force of gravity applied by the earth on the object. In the similar fashion, object also applies same force to the earth and tries to attract the earth towards it. But the earth mass is very large, so the acceleration produced in the object is very small or negligible.

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