Quiz 11: WS9.3 Answer

Kowloon Tong School (Secondary Section)

F.2 Integrated Science Quiz 11: WS9.3

Multiple Choice (5 marks)

1	2	3	4	5
D	D	B	C	C

Fill in the Blanks (12 marks)

1      The Earth exerts a (1)force of gravity on every object on or around it. It (2)pulls objects towards the (3)centre of the Earth.

2      The (4)weight of an object on the Earth is the force of gravity exerted by the Earth on the object. It can be (5)different when it is measured on different celestial bodies.

3      The (6)mass of an object is the amount of matter it contains. It is (7)the same in all places.

4      A 50 kg boy is weighing himself on planet X and the reading is 200N. His mass on planet X is

(8)50kg and is (9)50kg on the Earth. The force of gravity exerted by planet X

on him is (10)200N. The force of gravity of planet X is (11)smaller

(larger/smaller) than that of the Earth. His weight on planet X is (12)smaller (larger/smaller) than his weight on the Earth.

Challenging Questions (Bonus 2 marks)

He feels heavier in planet Y.

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

Quiz 9: WS9.1 Answers

Kowloon Tong School (Secondary Section)

F.2 Integrated Science Quiz 9: WS9.1

Multiple Choice (4 marks)

1	2	3	4
C	D	A	B

Fill in the Blanks (9 marks)

1      A (1) force can start and (2)stop the motion of an object.

2      A force can also change the (3)speed and the (4)direction of motion of an object.

3      (5)Spring balance is an instrument which is used to measure forces. The unit of force is (6)Newton and the symbol is (7)N.

4      The forces that act on object through direct contact are known as (8) Contact forces. The forces that can act on objects without direct contact are called (9) Non-contact forces.

Challenging Questions (Bonus 2 marks)

1.      Describe one effect of forces seen when a bowling ball hits the pins.

The bowling starts the motion of the pins. / The bowling changes the speed and direction of the pins.

2.      When a football player hits the ball, the force changes the speed and direction of the ball.

Ch 9 Worksheet Answer

First Term IS Performance

Passing %:

2A = 24.1%

2C = 17.2%

F2 Workbook Ch7-8

https://drive.google.com/file/d/0B_gu6NfmHHGWRE9RU0hFYnNvQVE/view?usp=sharing

Quiz 8: WS8.3-8.4 answers