Answer the following questions:
1. Differentiate between the force in contact and force at a distance, Give two examples of each,
2. What are the advantages and disadvantages of friction?
Answers
Explanation:
2)Advantages of Friction:
*Friction is responsible for many types of motion
It helps us walk on the ground
*Brakes in a car make use of friction to stop the car
*Asteroids are burnt in the atmosphere before reaching Earth due to friction.
It helps in the generation of heat when we rub our hands.
Disadvantages of Friction:
*Friction produces unnecessary heat leading to the wastage of energy.
*The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects.
*Forest fires are caused due to the friction between tree branches.
*A lot of money goes into preventing friction and the usual wear and tear caused by it by using techniques like greasing and oiling.
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