Lab 7C -Energy and Efficiency

For Lab 7C you are launching the car from the right hand side of the track.  Where does the photogate get placed on the track?

• 20 cm from the launch point.

• At the rubber band that bounces the car back toward the starting point.

• Just to the left of the half-way point.  

• Just to the right of the half-way point.

In the 1st part of the lab, you are manipulating the _____ to see how it affects efficiency.

• location of the photogate

• launch speed of the car

• mass of the car

• slope of the track

What is the equation for calculating Efficiency?

• 

• 

• 

• 

How many marbles are you using for the 2nd Part of the experiment?

• Zero marbles for all trials.

• 1 marble for all trials.

• O, 1, 2, and 3 marbles for the four trials.

• 2 marbles for all trials

You are making two graphs with Efficiency on the y-axis both times.  What variables go on the x-axis?  Pick all that apply.

• efficiency

• mass of car (kg)

• speed before bounce (m/s)

• distance the bolt is screwed out (cm)