# Slingshot Problem

1. Jun 16, 2013

### CollegeJunior

1. The problem statement, all variables and given/known data

You shoot a 0.08 kg box across the ground with 60 N/m slingshot, stretched back 0.15m. The box slides 4.22m before coming to a stop. What is the force of friction acting on the box as it slides across the ground?

2. Relevant equations

EPE = 1/2kx^2

3. The attempt at a solution

E1 = 1/2(60)(0.15)^2
E1 = 0.3375J
W = 0 - 0.3375J = -0.3375J

2. Jun 16, 2013

### rock.freak667

Right so all the work done by the slingshot will be opposided by the work done by the frictional force.

How would you calculate the work done by the friction force F with a distance of 4.22 m ?

3. Jun 16, 2013

### CollegeJunior

W = F * D, so F = W / D? I got around -0.08 N for force. Is that the Force of Friction?

4. Jun 16, 2013

### haruspex

You seem to have halved twice over.

5. Jun 16, 2013

### CollegeJunior

??????????????

6. Jun 16, 2013

### Staff: Mentor

Verify your calculation of E1.