sci test please answer all questions
Answers
Answer:
1.Friction is caused by the interlocking of irregularities of the two surfaces when one object is placed over another object. If the two surfaces of objects are pressed together harder by a great force, then the friction will increase. Suppose we have two boxes of same size but one box is light and other box is heavy.
2.There is a friction whenever an object moves through a fluid.It is called fluid friction.The fluid friction or drag can be reduced are minimised by giving special shape called streamlined shape to the objects which Move through fluids like air or water .
3.sportsmen use shoes with spikes to increase the friction so that the shoes do not slip while they run or play.
4.Streamlined shape is the shape of a substance which is made for reducing the friction between it and substance in contact with it . eg: fish has streamlined shape for reducing the friction from water.
5.When one body rolls over the surface of another body, the resistance to its motion is called the rolling friction.
7.Friction produces heat when we vigorously rub our palms together for a few minutes.
Friction is responsible for wear and tear of various parts of machines.
Friction decreases the efficiency of machines as a part of the machine’s energy is lost in extra friction.
Friction is used in gripping or holding an object with our hands.
8.The interlocking of irregularities of the two surfaces opposes the motion of one object over the other and give rise to force of friction. Friction is caused by the interlocking of irregularities in the surface of two objects which are in contact with each other.
10.When a banana peel falls on the ground then it makes the surface smooth leading to reduction of friction between the floor and our feet. Since, we are able to walk because of friction so in the presence of less friction we slip and fall down.
Explanation:
Answer:
I hope it's helpful for you
please mark me brainlest
