What is a LEVER ??
** a lever is a SIMPLE MACHINE that hepls us to do work more easily
[ sejenis mesin ringkas yg boleh memudahkan kerja kita ]
Ok, jom tengok video kat bawah ni (jgn tengok jek..sila faham betul-betul ^__^)
The video shown above explain us about the PRINCIPLES OF LEVER.
>> states that when a lever is in EQUILIBRIUM, the product of load and distance of load from fulcrum is EQUAL to the product of effort (force) and the distance of effort from fulcrum.
It can be represented by this following formula :
Load (L) x distance of load form fulcrum (l) = Effort (E) x distance of effort from fulcrum (e)
[ Jebat dan Si Gajah ]
Macam contoh pada gambar di atas. Kalau kita nak seimbangkan sesuatu tuas itu, kita perlulah UBAH jarak beban (load) atau daya (effort) dari fulkrum.
Memandangkan Jebat lagi ringan berbanding Si Gajah, maka jarak Jebat dari fulkrum adalah lebih BESAR berbanding jarak Si Gajah dengan fulkrum. Jadi, bila dah ubah jarak masing-masing dari fulkrum..baru laaa SEIMBANG ^___^
## Example 1:
What is the minimum force that is required to lift the load with a force acting on it of 300N ?
(jawab dulu ok, baru tengok jawapan di bawah)
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Answer :
Load (L) = 300 N
Distance of load from fulcrum (l) = 2 m
Effort = ? N
Distance of effort form fulcrum = 10 m
Load (L) x distance of load form fulcrum (l) = Effort (E) x distance of effort from fulcrum (e)
E = ( L x l ) / e
= (300 N x 2 m ) / 10 m
= 600 Nm / 10 m
= 60 N
So the minimum force required to just lift the load is 60 N.
## Example 2:
What is the maximum force that can be lifted with a force of 400 N if the lever on the right is used?
Answer :
Load (L) = ? N
Distance of load from fulcrum (l) = 6 m
Effort = 400 N
Distance of effort form fulcrum = 18 m
Load (L) x distance of load form fulcrum (l) = Effort (E) x distance of effort from fulcrum (e)
L = ( E x e ) / l
= (400 N x 18 m ) / 6 m
= 7200 Nm / 6 m
= 1200 N
So the maximum force that can be opposed with a force of 400N is 1200N.
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