Quiz 10: WS9.2 answer

Kowloon Tong School (Secondary Section)

F.2 Integrated Science Quiz 10: WS9.2

Multiple Choice (4 marks)

1	2	3	4
A	A	C	B

Fill in the Blanks (7 marks)

1      (1) Friction always oppose the sliding motion of an object. It acts along the

(2)contacting surfaces of two object.

2      Oil can be added between the moving parts of machines to smooth the motion. Therefore, oil is a

kind of (3)lubricant.

3      In bicycle wheels, (4)ball bearings are used to reduce friction.

4      (5)Water resistance opposes our motion when we swim in water.

5      Cars are designed with (6)streamlined shape to reduce air resistance.

6      There is (7)air cushion between a hovercraft and the water surface. The allows the hovercraft to travel at high speeds on water. A hovercraft à