In every motion, we encounter a force of friction but we seldom cate to require a note of it. you will undergo the subsequent examples to find out about.
1. in an exceedingly game of ball, a player kicks the ball. The ball is ready in motion. The ball goes rolling along the bottom. The rolling ball moves on the bottom for a brief distance, it slows down and involves a stop. How and why does this happen?
2. While moving on a bicycle on the road you pedal the bicycle and travel and on. Why does this happen? an easy answer to the present is that while in motion the tires of the bicycle are rubbing against the surface of the road. When two surfaces rub on each other, a force comes into play. This force acts within the direction opposite to the direction of the motion. Thus, it slows down the motion and eventually brings the moving object to a stop. The force which resists the motion of a body while moving on a surface is named friction.
Now, you’re in a very position to elucidate the movements of a rolling ball, it’s slowing down so coming to a stop. you’ll be able to also give many samples of happenings in day-to-day life once you encounter a force of friction but seldom take a note of it.
3. a woman is pushing a significant box. The box isn’t getting pushed. She isn’t ready to move it. the underside of the box is on the ground. The force from the friction is over the push force being exerted by the girl. The box will move only if a greater force than the force from the friction is applied to the box. Once the box starts sliding you will find it easier to maneuver the box already in motion.
The force of friction may be a force that opposes the motion of a body connected with the surface of another body. this can be also called frictional force. It acts on both surfaces.
STATIC FRICTION AND SLIDING FRICTION
When a force is applied to an object to maneuver it and it doesn’t move, the force applied is balanced by the force of friction. this is often called static friction. Static friction ends with the start of sliding of the thing at rest. The minimum force required to create a body just to slip over the surface is adequate to the sliding friction. Once a body slides the sliding friction has reduced a touch. it’s but the static friction.
The frictional force is that the force generated when two surfaces rub against each other. The frictional force acts in a direction opposite to the direction of the motion.
Smooth and Rough Surfaces Some surfaces are smooth and a few are rough. Some are less rough and a few are rougher. On examining a smoothened and polished surface of a wooden block under a hand glass, you will be able to observe some ridges and furrows. Thus, even the surface which appears to be very smooth encompasses a sizable amount of irregularities.
FRICTION IS HARMFUL
1 . Friction increases the price of motion and adds to the consumption of energy: Friction acts all the time. It reduces the speed of the body in motion Additional force needs to be applied from time to time to keep up motion and also the speed. For this, more of fuel is consumed. This adds to the value of running. to save lots of fuel ways and means are adopted to cut back friction. Friction ends up in a waste of energy.
2. Friction generates heat: Object in motion over a surface gets heated on running at a speed and for an extended distance. we’ve got to adopt the cooling system. Cars and trucks use coolant and Mobil oil to stay the engine cool. in a very railway train, the axle of wheels is oiled for keeping them cool. Even then fire accidents in cars and trains happen.
A common example of damage and tear is seen on the eraser while you rub the writing on a paper sheet with it. The eraser wears out. you’ll be able to easily compare the difference between wear and tear on smooth and rough surfaces