1. Why do we slip when we step on a banana
peel?
2. Why is sliding friction less than static
friction?
3. Why do athletes use shoes with spikes?
4. State True or False: We can write on paper
because of friction.
1. true
2. false
5. How fishes move easily in water?
6. What is streamlined?
7. Why liquids and gases are called as fluid?
8. Write the factors on which drag exerted by
fluid on an object depends.
9. Define rolling friction.
10. Why do kabbadi players rub their hands
with soil?
Pls answer correct answer's
Answers
Answer:
1ans. We slip when we step on a banana peel because the inner side of banana peel being smooth and slippery reduces the friction between the sole of our shoe and the surface of road.
2ans. For a given two surface, sliding friction is slightly lesser than that of the static friction because it is easy to move the object which already in motion than the object which is at rest.
3ans. Sportsman use shoes with spikes to increase the force of friction between the shoes and the ground. The increased force of friction give them a better grip while running.
4ans. Friction between pen and paper enables us to write on the paper. It enables us to hold pen. so this is true.
5. Fish swim by flexing their bodies and tail back and forth. Fish stretch or expand their muscles on one side of their body, while relaxing the muscles on the other side. This motion moves them forward through the water. Fish use their back fin, called the caudal fin, to help push them through the water.
6ans. design or provide with a form that presents very little resistance to a flow of air or water, increasing speed and ease of movement.
7ans. Liquids and gases are called fluids because they can be made to flow, or move. In any fluid, the molecules themselves are in constant, random motion, colliding with each other and with the walls of any container.
8ans. The resistance offered by fluids is called fluid friction or drag. It depends upon the shape of the object , speed of the object , and nature of fluid.
9ans. The force resisting the motion of a rolling body on a surface is known as rolling friction or rolling resistance.
10ans. By rubbing their hands with soil, they make their hands rough. A rough surface has more friction which enhances their grip while holding the opponent.