How can you feel one newton force?
19. What is meant by force of gravity?
20. Give reason.
a. School bags are provided with wide straps to carry them.
b. The walls of a dam are thicker near the bottom than at the top
21. Define pressure. Give its S.I. Unit.
22. Give any two applications of pressure in our daily life.
23. What is frictional force? Give one example.
24. What are the two parameters that define pressure?
25. Explain why astronauts wear specially designed spacesuits?
26. What is atmospheric pressure?
27. Why do mountaineers suffer nose bleeding at high altitudes?
28. What are non-contact forces?
29. What is electrostatic force?
Answers
Answer:
Explanation:
one newton is equal to 1 meter per second ^2 acceleration brought to a 1 kg weighing body.
force of gravity is the force which attracts everything to earth it was discovered by sir Issac Newton and the force of gravity on earth is 9.8
the formula of pressure is force / area so if we increase the area under contact then the force will decrease so that's why we have wide straps in bags
the walls of dam are thick near bottom to withstand the high pressure by water
pressure is defined as force per unit area. S.I unit of pressure is pascal which is denoted by P
cutting a fruit with a knife, doctor injecting a syringe
frictional force is the force applied by the surface in contact of a body which tries to oppose the motion of the moving body, example is a ball rolling on floor stops after some time
mass and volume are the two parameters which define pressure
astronauts wear spacesuits as to maintain the pressure exerted on their body
atmospheric pressure is the pressure exerted by atmosphere on earth
humans most sensitive blood vessels are of nose so when there is very less pressure like in mountains the blood starts flowing
forces which are not in physical contact with the body
attraction of any object due to charge for example try rubbing your ruler on your head and then it'll attract light objects like pencil shavings