Physics oral
1 What is Friction?
2 What is Muscular Force? Give examples
3 We see lightning first and hear thunder. Why?
Answers
Answer:
1.Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.
Explanation:
1.ans= Friction is a force between two surfaces that are sliding, or trying to slide, across each other. Friction always slows a moving object down. ... The amount of friction depends on the materials from which the two surfaces are made.
2.ans= The force applied by the action of muscles in our body is termed as a muscular force. For example, when you pick up a book placed on the table using your hands, you apply muscular force.
3.ans= If we are watching the sky, we see the lightning before we hear the thunder. That is because light travels much faster than sound waves. ... It takes approximately 5 seconds for the sound to travel 1 mile. If the thunder follows the lightning almost instantly, you know the lightning is too close for comfort!