Worksheet Chapter 8: Force and Motion

1. Explain using the concept of pressure why camels can walk easily on soft desert sand without sinking, whereas horses sink rapidly.

2. Explain why deep-sea submarines require thick metal hulls to dive deep into the ocean, using concepts of liquid pressure.

3. State TWO methods used to reduce frictional force in mechanical machine parts.

4. True or False: Gas pressure inside a syringe increases when the plunger is pushed inward, reducing internal volume.

5. Classify the following items into First Class Lever, Second Class Lever, or Third Class Lever: (a) Scissors, (b) Wheelbarrow, (c) Tweezers.

6. Which factor directly INCREASES the pressure exerted by a solid object on a surface?

7. Fill in the blank: The turning effect of a force about a pivot point is called the ________ of force.

8. True or False: A wheelbarrow is an example of a First Class Lever because the pivot is located in the middle.

9. A mechanic uses a long spanner to loosen a stubborn nut. A force of 80 N is applied perpendicularly at a distance of 0.25 m from the nut. (a) Calculate the moment of force exerted on the nut. (b) How can the mechanic increase the turning moment without increasing the force applied?

10. A wooden block with a weight of 120 N rests on a table. The area of its base in contact with the table is 0.3 m². Calculate the pressure exerted by the block on the table.