LSCPHYS1: EFFECTS OF FORCES Assignment

THINK!

Devise and carry out an experiment to investigate how friction varies with area of contact. Record your results in a suitable table. Use the same materials and equipment. What is your conclusion?

Self-Assessment exercise

1. Distinguish between balanced and unbalanced
2. Does the footballer in Figure 19 exert a contact force or a non- contact force on the ball? Explain your answer.
3. a) Give two examples where friction is a Explain why this is the case.

b) Give two examples where friction is an advantage and explain why is the case.

4. You have been given sheets of four different materials: sandpaper, polished wood, rubber and Design an activity to compare the amount of friction when a wooden block is pulled across each of these surfaces. Your account should include:

• • The apparatus
  • What you would
  • The results you would expect to
  • How you would use the

5. Two forces of 12N and 5N act at right angles to each Calculate the resultant of these forces.