Question

A student pushes a 40-N block across the floor for a distance of 10 m. How much work was applied to move the block?


A.
4 J


B.
40 J


C.
400 J


D.
4000 J

Answer 1

I'm not 100% sure about this one but I would go with C.

Answer 2

I think it's also C because work=force x distance.

Answer 3

Right! Because the force and displacement are in the same exact direction, you can use that formula.

Answer 4

thanks everyone! You all are very helpful!

Answer 5

:) You're welcome!
More generally,
\(\large W=F\dot\ d\dot\ \cos(\theta)\) where \(\theta\) is the angle between force and displacement.

You can see that, when they're in the same direction, \(\theta=0\)
\(\implies W=F\dot\ d\dot\ \cos(0)=F\dot\ d\dot\ 1=F\dot\ d\)