Bullseye Can Lab

• Land the ball bearing in the can!!• You determine the method after being

provided the material.• Lab write-up is due November 10th

Lab Report Components• Introduction – discusses science behind projectile motion as

well as the equations that describe that motion. (10 pts)• Problem statement – what is the objective of the lab? (5 pts)• Materials (you list) (5 pts)• Procedure (what methodology did you devise? (10 pts)• Data (10 pts)

– Velocity measured (include method under procedure)– Show calculations for:

• Time in air• Expected velocity• Expected travel distance

• Analysis – did the ball bearing travel the horizontal distance expected? If not, why not. How many times did it take for you to land the bearing in the can? (10 pts)

• Conclusion – summarize the experiment and include a discussion on your success or lack thereof. What possible experimental errors may have come into play? (5 pts)

Performance Grade30 pts/20 pts/10 pts/ 0 pts

• You will need to time how long it takes the ball to travel a set distance once it leaves the conduit.

• Friction will be a factor, so the shorter the distance, the better.

• 20 cm is ideal, but human reaction time becomes a factor.

• 40 cm is a possibility, but the velocity will be slower at the end of the 40 cm than it was coming out of the conduit.– Is there any method you could use to determine how

much the ball slows down the further it goes? Could you use that information to back calculate to a better approximation for the initial velocity?

Performance continued

• You will be assigned an area. • Think about the equations you need (how long it takes to

fall a set distance, how far will it travel in that time).• Make the appropriate measurements. Any ball dropping

to the floor counts as one measurement, be careful when determining velocity.

• You may use masking tape to mark of distances and areas.• Once you are ready for a trial, show me your calculations.

The entire class will watch the test, so everyone else must stop working when a lab group is ready to test their math.