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

I just answered this...

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.

Answer 2

the force is 9.8 newtons, the distance is the distance up or down the ball moves because gravity only acts vertically,



you have to find out how far up or down the ball moves, the horizontal distance the ball moves does not matter

the problem you gave does not specify the height difference between the top and bottom of the ramp

if you lift the 9.8N ball 10 metres high:

W =f x d = 2 x 9.8 X 10 = 196joules

Answer 3

The distance is 10 meters. The force is F = mg = 2 * 9.8 due to gravity.

Work is w= 10 * 2 * 9.8 = 196 J