Work=force x distance?

Question

Well im in my science book and im confused

the book is telling me to use

the formula work= force x distance

anybody mind explaining it using this problem?

:

Julie rolled a 2-kg ball down a ramp 10 meters long.

(1 KG= 9.8 NEWTONS) how much work was done?

Answer 1

work done= force  x distance

force is newtons so if theres a 2kg ball and 1kg= 9.8

then the force is 19.6 newtons

then the distance is 10 meters

so 19.6 x 10 = 196 newton meters

that helpful?? :)

Answer 2

Previous answer is wrong.

first of all rolling a ball DOWN a ramp, you are not doing any work. The ball is rolling by itself (I assume).

If you roll the ball UP the ramp, then work is done. How much depends on friction and on the slope of the ramp.

Assuming no friction, and the ramp is 2 meters up for 10 meters long;

Force is the weight of the ball, 2 x 9.8 = 19.6 N

Distance the ball is lifted is 2 meters.

Work is 19.6 x 2 = 39.2 Joules.