Science Form 2: Chapter 10: Lever
Easy way to memorise the positon of F (fulcrum),L (load),E (effort)
1st class lever: Father - Fulcrum
2nd class lever: Loves - Load
3rd class lever: Eating - Effort
If fulcrum is between effort and load,it is first class lever.
If load is between fulcrum and effort,it is second class lever.
If effort is between load and fulcrum,it is third class lever.
1st class lever: To lift a large load use little effort,the distance of the effort from he fulcrum (effort distance) must be further than the distance of the load from the fulcrum (load distance).
2nd class lever: To increase the turning effect of the effort,the effort should be further away from the fulcrum than the load is.
3rd class lever: To be effective,the effort has to be nearer to the load than the fulcrum.
PT3 Practice:
1. Ahmad who weighed 70 kilograms sits on one end of the see-saw while his brother who weighed 40 kilograms sits the other end of the see-saw.The end which Ahmad sits moves downwards while the other moves upwards.Explain this occurence and suggest one way to make the see-saw balance. ( 3 marks)
Please comment your answer below.
PT3 Practice:
1. Ahmad who weighed 70 kilograms sits on one end of the see-saw while his brother who weighed 40 kilograms sits the other end of the see-saw.The end which Ahmad sits moves downwards while the other moves upwards.Explain this occurence and suggest one way to make the see-saw balance. ( 3 marks)
Please comment your answer below.