Physics Practice: Force and Pressure (Mock Test 3 - Advanced)
1. Why is it easier to stop a moving bicycle than a moving truck at the same speed?
2. When a deep-sea diver goes deeper into the ocean, why must they wear a specially designed suit?
3. Friction is often called a "Necessary Evil" because:
4. The magnitude of buoyant force (upthrust) acting on a body immersed in a liquid depends on:
5. Why do porters place a round piece of cloth on their heads when carrying heavy loads?
6. A wooden block is placed on a table. If we turn the block so that it stands on its smaller face, the force it exerts on the table ________ but the pressure it exerts ________.
7. Which of the following describes the "Turning Effect" of a force?
8. Why does a fountain pen leak at high altitudes?
9. "Streamlining" the body of an aeroplane or a fish helps to:
10. Two similar balloons are filled, one with Air and one with Hydrogen. The Hydrogen balloon rises up because:
11. Force is a vector quantity because it has both:
12. A rubber sucker sticks to a smooth wall because:
13. Which of the following will decrease the pressure exerted by a solid on a surface?
14. The force of friction depends on the ________ of the two surfaces in contact.
15. Why do skiers use long, flat skis to slide over snow?
16. An object of mass $5 \text{ kg}$ on Earth is taken to the Moon. Its mass will be ________ and its weight will ________.
17. Which of the following is the correct formula for Pressure ($P$), Force ($F$), and Area ($A$)?
18. Rolling friction is ________ than sliding friction.
19. If you push a wall with all your strength and the wall does not move, the net work done on the wall is zero, but the force applied is:
20. Ball bearings are used in bicycles and fans to reduce friction by converting:
