work and the joule

Question 1

Define work done

Answer 1

The work done, is the product of the force and the distance moved by the force in the direction of movement.

Question 2

What is the equations of work done

Answer 2

w = f x s

power x time = work done

Question 3

what is the link between energy transferred and work done

Answer 3

they are the same

Question 4

is work a vector or scalar quantity and why

Answer 4

its a scalar quantity because it has a magnitude but no direction.

Question 5

what can work done be though of as

Answer 5

amount of energy transferred from one form to another

Question 6

a man pushes a shopping trolley with a horizontal force of 28N, moving a distance of 12m.

A) how much work did he do on the trolley if there was no friction

B) How much work did he do on the trolley if the frictional force was 8N

C) what is the meaning of the subtraction of the work done in part a and b.

Answer 6

A) 336J

B) 240J

c) 96J was done in overcoming the frictional forces and this work was not done on the trolley

Question 7

what is the SI unit of work done

Answer 7

J ie.joule

Question 8

What is the equivalent of 1 joule in newton terms

Answer 8

Newtonmetre

Nm

Question 9

For vertical motion what is the significance of Force (F)
in the equation

W = FS

Answer 9

F = mg

force here is the weight of the object

Question 10

an object of mass 34kg is raised from the ground to a shelf 7.5 metres above the ground. How much work has been done?

GIVE STEPS

Answer 10

W= fs
W= mg x distance in direction of force

W = 34g x 7.5

W= 2500J

Question 11

what is the equation for work done when force applied at an angle

Answer 11

w = Fs Cos theta