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4. The force of friction acts on moving objects and its direction is opposite to the direction of motion.
5. Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.
6.
7. It always resists the motion, so extra energy is required to overcome it.
It causes wear and tear of machines.
It decreases the life expectancy of moving parts of vehicles.
Since friction is very useful in some cases while harmful in some cases, friction is called a necessary evil.
8. By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.
9.Answer:For example, vehicles can't move on a road covered with snow. In such cases we have to throw sand on the road to increase the friction. When you apply the brakes in a car, you again increase contact area and force.
10. 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 liquids and gases.
11. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.
5. Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.
6.
7. It always resists the motion, so extra energy is required to overcome it.
It causes wear and tear of machines.
It decreases the life expectancy of moving parts of vehicles.
Since friction is very useful in some cases while harmful in some cases, friction is called a necessary evil.
8. By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.
9.Answer:For example, vehicles can't move on a road covered with snow. In such cases we have to throw sand on the road to increase the friction. When you apply the brakes in a car, you again increase contact area and force.
10. 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 liquids and gases.
11. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.
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Explanation:
1. Example:-
⚛ Rope is pulled to draw water from a well...
⚛ A drawer is pulled to open it..
2. 3 effects of a force :-
⚛ A stationary object to move...
⚛ A moving object to change it's speed...
⚛ A moving object to change it's direction of motion...
3. Some example that we do experimentally:-
⚛ When we stretch a rubber band ,,when it's shape and size changes...
⚛ When we apply force to clay then it's shape and size changes...
4. ✳ Force of friction :- The force required to initiate or to maintain relative motion against friction...
✳ The frictional force is the other components is it in a direction parallel to the plane of the interface between object...
5. The factors which directly affect the force of friction :-
⚛ The smoothness of the surface..
⚛ The weight of the object or the amount of force on the surface by the object...
6. While sliding a wooden surface,,,, an object experience more friction...
7. Disadvantages of friction :-
⚛ It causes wear and tear of machine..
⚛ It always resist the motion.. so extra energy is required to overcome it...
⚛ It decrease the life expectancy of moving parts of machine...
8. Methods to reduce friction:-
⚛ By polishing the surface...
⚛ When object are rolled over the object...
9. Where we need higher friction:-
⚛ Vehicle can't move on a road covered with snow,,, in such case we have to throw sand on the road to increase friction....
⚛ When we apply breaks in a car,,, we again increase contact area and force......
10. 3 kind of friction are :-
⚛ Rolling friction
⚛ Starting friction
⚛ Sliding friction..
11. Ways to minimize rolling friction :-
⚛ Replace sliding friction with rolling elements friction,,, such as with the use rolling elements bearing...
⚛ By polishing the surface,,,, as polishing makes the surface smooth and friction can be reduced....
I hope it will be helpful ✌✌✌✌✌
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