A force of 100 N pushing a 10 kg box over level ground does 300 J of work on the

Question

A force of 100 N pushing a 10 kg box over level ground does 300 J of work on the box. Through what distance was the force applied?

A force of 100 N is used to raise a 10.0kg box from rest on the ground to rest on a nearby shelf 2.00 m above the ground. How much work was done in raising the box?

A spring with a spring constant of 2.0 N/m is compressed by 50 cm. How much work was done on the spring?

Calculate the gravitational potential energy of a 10 kg mass located 5 meters above the surface of the earth?

Explanation / Answer

a) A force of 100 N pushing a 10 kg box over level ground does 300 J of work on the box. Through what distance was the force applied?

let d distance was the force applied.

so, work done by force = 300

100*d =300

d = 3 m

b)A force of 100 N is used to raise a 10.0kg box from rest on the ground to rest on a nearby shelf 2.00 m above the ground. How much work was done in raising the box?

so, work done by force = 100*2 = 200 J

c)A spring with a spring constant of 2.0 N/m is compressed by 50 cm. How much work was done on the spring?

work done on spring = kx2/2 = 2*0.5*0.5/2 =0.25 J

d)Calculate the gravitational potential energy of a 10 kg mass located 5 meters above the surface of the earth?

gravitational potential energy = m*g*h = 10*9.8*5 = 490 J

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