1. Construct a glossary of the key terms in this unit. You could
add it to the one you made for Units 1 and 2. 2. Describe what happens to a ball when you drop it from a height
of 2 metres.
3. Explain the difference between average velocity and instantaneous velocity.
4. A bus travels 80 km due south in 2 hours. It then travels 100 km due west in 3 hours. What is the average velocity of the bus?
5. A car is travelling at 50km / h The driver sees a child run out into the road 5 m ahead. She applies the breaks and the car stops in 5 seconds. The driver's thinking time is 1.5 s.
a) Will the car stop in time?
b) If the driver's thinking time is increased to 2.5 s, will the car stop in time?
c) What happens if the thinking time is 1.5 s but the car is travelling at 64km / h
6. What assumption do you have to make if you are asked to do a
calculation on a falling body?
7. A boy walks to school. He walks 3 km in 30 minutes. He meets some friends and they talk for 10 minutes before they carry on walking to school. They walk 1 km in 15 minutes.
a) Draw a displacement-time graph to show the boy's journey to school.
b) What was the average velocity of the boy's journey? Give your answer in m / s
8. Explain, in terms of forces and acceleration, what happens
when a body is moving in uniform horizontal circular motion. 9. How do the forces on a body moving in a vertical circle vary?
10. What is the difference between radial and tangential acceleration?
11. What is relative velocity?