Answer. Though friction is said to be a waste of energy in most of the times, it is really useful at many times in regular life. We need to increase the frictional force while pressing the brakes of a car or a bicycle to stop it at the right time.
Summary
- Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction.
- Static, sliding, and rolling friction occur between solid surfaces.
- Fluid friction occurs in fluids, which are liquids or gases.
Any ball or wheel has rolling friction when rolled on a surface. Some examples of items that have rolling friction are: Soccer ball, basketball, or baseball. Car tires.
Sometimes the friction is bad because it can hurt your loose tooth when you're brushing it. Also, if you brush too hard, and there's too much friction, it can hurt. If you brush too hard, it could hurt you. Scrubbing helps clean, but scrubbing too hard can damage an object.
Without friction between the shoes and the ground, you cannot walk properly. If there is no friction, all of us would be sliding around without any control over ourselves. While walking, you're pushing your foot back as you try to step forward. Friction holds your shoe to the ground so you can walk around.
Friction can be a useful force because it prevents our shoes slipping on the pavement when we walk and stops car tyres skidding on the road. When you walk, friction is caused between the tread on shoes and the ground. This friction acts to grip the ground and prevent sliding.
Frictional force refers to the force generated by two surfaces that contacts and slide against each other. These forces are mainly affected by the surface texture and amount of force impelling them together. The angle and position of the object affect the amount of frictional force.
Helpful frictional forcesfriction between our shoes and the floor stop us from slipping. friction between tyres and the road stop cars from skidding. friction between the brakes and wheel help bikes and cars to slow down.
A force acting perpendicular to two surfaces in contact with each other. If weight is the only vertical force acting on an object lying or moving on a horizontal surface, the normal reaction force is equal in magnitude, but opposite in direction to the weight. Friction, therefore, is increased by increasing the weight.
Friction is the resistance of motion when one object rubs against another. Anytime two objects rub against each other, they cause friction. Friction works against the motion and acts in the opposite direction.
The resistance offered by the surfaces that are in contact with each other when they move over each other. Friction works in the opposite direction in which the body is moving making the body slow down. Friction is also dependent on external factors.
A useful model for explaining friction is the idea that all surfaces have tiny bumps. When two surfaces slide over one another the tiny bumps push on each other. Friction causes a force on a surface which is in the opposite direction to its motion.
The class 8 Science chapter 12 Friction, discusses friction and various factor affecting it. The force, which opposes the relative motion between two surfaces in contact is known as friction. It acts on both the surfaces.
A number of problems can be caused by friction between two objects or materials. Since friction is a resistive force that slows down or prevents motion, it can be a nuisance, because it can hinder motion and cause the need for expending extra energy.
Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.
Methods for decreasing friction:
- Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction.
- Lubrication is another way to make a surface smoother.
- Make the object more streamlined.
- Reduce the forces acting on the surfaces.
- Reduce the contact between the surfaces.
Friction is unmistakably a part of what causes foot blisters. This is bad friction. But friction is also good. In fact, it's vital to the way you walk, run and play.
A matchstick lights up due to the friction against the side of matchbox when we strike it, This can destroy houses when catches fire. The shoes of athletes are provided with spikes so as to increase friction and prevent slipping. The force of friction helps to hold the nails and screws on the walls and in the wood.
Friction may be good or bad, depending on the situation. A certain amount of friction between the ground and our shoes is necessary for efficient movement and to prevent slipping, but it also wears the soles of our shoes.
