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.