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

Quiz 7: WS8.2 answers

Fill in the Blanks (10 marks)

1      In some materials, there are electrons which are free to move (1) randomly in all directions. These electrons are called (2) free electrons.

2      The free electrons in a metal wire are ‘driven’ to flow in the (3) same direction when there is a dry cell in the circuit.

3      The free electrons flow from the (4) negative pole of the dry cell to the (5) positive pole. The flow of these free electrons forms an (6) electric current.            

4      An (7) ammeter is an instrument used for measuring the size of an electric current.

5      Electric current is measured in (8) ampere (A). Small electric currents are measured in milliamperes (mA).

6      We should always connect the (9) positive terminal of the ammeter towards the positive pole of the dry cell and the (10) negative terminal towards the negative pole.

Challenging Questions (Bonus 3 marks)

1.    In the diagram below, draw wires to show how the circuit should be connected in order to measure the electric current flowing through the circuit. Indicate the positive (+) and negative (-) terminals of the ammeter.