Work Energy Power And Elasticity

Question 1

Work done and work

Answer 1

WD= force x distance
W= mass x distance x gravity( when lifted vertically)

Question 2

Kenetic energy and potential energy

Answer 2

K.E= 1/2 x mass x velocity^2
P.E= mass x height x gravity

Question 3

Conservation of energy

Answer 3

Initial p.e + initial k.e = final p.e + final k.e

Change is total energy = workdone

Question 4

Varying force, work done

Answer 4

Wd = intergral of F dx
Or -F dx if its against gravity

If an object of mass m is at a distance r from a larger body of mass M, g= - GMm/ r^2

Question 5

Power

Answer 5

Power= force x velocity (w)
W=J

Question 6

Hookes law

Answer 6

T = lambda(x)/ l

Where t is tension or thrust
Lambda is the modulus of elasticity
X is the difference between the length and the natural length
And l is the length

Question 7

Work done to compress or stretch spring

Answer 7

Wd= lambda x^2 / 2l