Physics Worksheet (Page 3 of 3) in pdf

Physics Worksheet Page 3

9. a. State the principle of moments. …………………………………………………………………...

……………………………………………………………………………………………………………..

(2)

b. What is meant by the moment of a force? …………………………………………………………

……………………………………………………………………………………………………………..

(2)

John is practising windsurfing as shown in below. Suddenly the wind force increases and he leans

backwards to balance his windsurf.

(i) Calculate the moment produced by the wind force. …………………………………………………. (2)

(ii) What is the moment caused by John if he balances his windsurf? ………………….……………. (1)

(iii) Find the value of distance ‘d’.

………………………………………………………………………………………………………………..

…………………………………………………………………………………………………………….…

(3)

…………………………………………………………………………………………………………….….

0.5 m

0.4 m

pivot

6 N

8 N

The diagram above shows a uniform metal rod which is balanced at its midpoint.

(i) Calculate the anti-clockwise moment. …………………………………….…………………….

(2)

(ii) What is the value of the clockwise moment? ………………………………………………….…

(1)

(iii) Given that the metal rod is 1 m long, calculate the distance ‘x’. …………………………………

(1)

(iv) Find the value of force F.

……………………………………………………………………………………………………………..

…………………………………………………………………………………………..………………………

…………………………………………………………………………………..………………………………

(3)

…………………………………………………………………………………………….….......................

Physics Worksheet Page 3