Physics - Force and Pressure, Friction and Universe (Revision Sheet)
1. What is the necessity of pressurized cabins and airplanes?
2. You are provided with two surfaces, one smooth and one rough or uneven. Try to stick a rubber sucker on both the surfaces. Will you succeed in doing so? Give reasons for your answer.
3. Can a scuba diver dive into the ocean wearing ordinary clothes? Why or why not?
4. Why do some people experience nasal bleeding at high altitudes?
5. Explain Why, it is easier to drag a mat on floor when nobody is sitting on it but much more difficult to drag the same mat when a person is sitting on it.
6. Name the type of force in the following cases.
(a)
Force exerted between heavenly bodies.
(b)
Force to pull a heavy object.
(c)
Force that slows down moving objects.
(d)
Force due to charged particles.