Name ___________________________________

Experiment #1

1. Measure the height of the box. d = _________

2. Attach the spring scale to your model car and lift the car up to the top of the box. Record the force needed. f = _________

3. Complete the formula, W = d X f.

_________________________________

Experiment #2

Using the shortest ramp you have, measure the ramp and fill in under "d" below. Place the ramp against the top of the box. Place your model car at the end of the ramp on the lowest side. Attach your spring scale and gradually pull the car up the ramp to the top of the box. Measure the amount of force needed to move the car to the top of the box.
d = ___________

f = ___________

W = f X d

W = ___________

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Experiment #3

Using the middle sized ramp, complete this experiment exactly as you completed Experiment #2. Record your measurements below and complete the formula, W = f X d.
f = __________

d = __________

W = f X d

W = __________

Experiment #4

Measure the longest ramp you have. Predict the force that will be needed to pull the car up the ramp.

length of the ramp ___________________________

prediction of the force needed ____________________________

Again, place your ramp against the box and position your car at the bottom of the ramp. Attach the spring scale and pull the car up the ramp. Measure the force needed to pull the car up to the top of the box and record.

Actual force needed to pull the car up the ramp _________________________

Difference in predicted force and actual force needed is _________________________