- #1

Vader07

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## Homework Statement

At the top of the ramp the body is stopped and then released. It slides down the ramp against a friction force of f= 10 Newtons. Find the body's change in kinetic energy in Joules after traveling a distance s= 3 m down the ramp.

## Homework Equations

There are three types of energy:

1) potential energy: Epot : the body is on top of the ramp (height h) at rest. The energy is Epot = mgh

2) frictional energy: Efric = cmg*cos alpha *s (= frictional force multiplied by the distance s that the body had gone down the ramp at a certain point.)

3) kinetic energy: Ekin = 1/2 mgv^2 : let's you calculate the velocity of the body.

The three energies are related in the following way:

Epot = Efric + Ekin, -->

Ekin = Epot - Efric .

## The Attempt at a Solution

KE = 1/2mgv^2

KE = 1/2(1)(9.8)^2

= 1/2(96.04)

= 49.04

F1 = (1)(9.8)sin(alpha)