# What is the minimum work needed to push a car

1. Oct 31, 2006

### bosox3790

What is the minimum work needed to push a 1025 kg car 200 m up along a 17.5° incline?

(a) Ignore friction.
I got 604117.9512J
(b) Assume the effective coefficient of friction retarding the car is 0.40?
how do I get this one?

2. Oct 31, 2006

### stunner5000pt

for a) what does work do? What aspect of the car does it change??? How do you calculate the work done then?

3. Oct 31, 2006

### bosox3790

Do I need to know Work in this case?

4. Oct 31, 2006

### stunner5000pt

you can calculate work

work changes the energy

5. Oct 31, 2006

### Euclid

Use the work-energy theorem:
$$W= \Delta K + \Delta U + |W_{fric}|$$
To find the minimum work, push the block slowly so that $$\Delta K=0$$. In (a), W_fric = 0. What is W_fric in (b)?