Applications of Newton's Laws (Friction, Tension, Normal Force) - SS1 Physics Lesson Note

Newton's laws of motion have numerous practical applications in understanding and analyzing various phenomena in our everyday lives. Let's explore some specific applications of Newton's laws related to friction, tension, and normal force:

1. Friction:

Friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. Newton's laws of motion are crucial in understanding and analysing the behaviour of frictional forces. Some applications include:

• Braking systems: Newton's laws help in understanding how friction between brake pads and a rotating wheel slows down or stops a vehicle.

Walking or running: Friction between our feet and the ground provides the necessary traction for walking or running. Newton's laws help explain the forces involved in maintaining balance and propulsion.

2. Tension:

Tension is a force transmitted through a string, rope, or cable when it is pulled at both ends. Newton's laws play a vital role in understanding and predicting the behaviour of tension forces. Some applications include:

• Elevator systems: Newton's laws help analyze the forces acting on the cables and the elevator car to ensure safe and efficient operation.

Suspension bridges: Understanding the tension forces in the cables and their distribution helps engineers design and maintain stable and structurally sound bridges.

3. Normal Force:

The normal force is the force exerted by a surface to support the weight of an object resting on it. Newton's laws provide insights into the nature and magnitude of normal forces. Some applications include:

• Walking on a floor: Newton's laws help us understand the normal force exerted by the floor to support our weight as we walk.

Driving a car: Newton's laws are used to analyse the normal force acting on the tires of a car, which affects its traction and stability on the road.