* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Name - Physics
Numerical continuation wikipedia , lookup
Dynamic substructuring wikipedia , lookup
Frictional contact mechanics wikipedia , lookup
Fictitious force wikipedia , lookup
Detailed balance wikipedia , lookup
Quasi-set theory wikipedia , lookup
N-body problem wikipedia , lookup
Relativistic mechanics wikipedia , lookup
Centrifugal force wikipedia , lookup
Length contraction wikipedia , lookup
Modified Newtonian dynamics wikipedia , lookup
Center of mass wikipedia , lookup
Velocity-addition formula wikipedia , lookup
Jerk (physics) wikipedia , lookup
Newton's laws of motion wikipedia , lookup
Classical central-force problem wikipedia , lookup
Magnetorotational instability wikipedia , lookup
Name_________________ Date__________________ Centripetal Force Lab Pre-Lab: 1. Show the SIMPLE formula for speed. 2. Suppose an object makes one revolution in a circle, the distance the object travels is called the circle’s ____________________________ 3. What is the “mathematical” formula for the term in #2? 4. Insert the formula mentioned in #3 into the simple formula for speed and show it below: 5. If you are swinging an object at the end of a rope around in a horizontal circle above your head, are you PULLING or PUSHING the rope? 6. ON the diagram below, draw an arrow on the ropes to represent the DIRECTION of the force (relative to the circle) that you are applying to the rope. The diagram below shows the view as if you are looking down from above on the object. When something accelerates in a circle we call it CENTRIPETAL ACCELERATION, symbolized by ac 7. Show the following relationships in the form of X Y CENTRIPETAL ACCELERATION is directly proportional to the square of the velocity ac CENTRIPETAL ACCELERATION is inversely proportional to the radius ac 8. Superimpose the 2 relationships together to form the centripetal acceleration formula and show it below. 9. Show the formula for Newton’s Second Law 10. Insert the formula for centripetal acceleration into the formula for Newton’s second Law and show it below. This is called CENTRIPETAL FORCE - Fc Centripetal Force Lab Purpose: To determine the mass of a stopper, using centripetal force rather than a balance Materials: centripetal force kit, balance, meter stick, stopwatch Procedure: 1. Measure the mass of a washer on a balance. Record the WEIGHT in the data table for Trial 1...THIS IS YOUR CENTRIPETAL FORCE. ALSO measure the stopper's mass and record. MASS OF STOPPER_______________ 2. Attach the washer securely to the bottom of the string coming out of the pen. 3. Practice swinging the stopper around at a constant speed so that the washers remain in a constant position (do not move up or down). 4. Record the time it takes to make 10 revolutions in the data table. Do this for three trials and find the average. 5. Calculate the average time it took for 1 revolution and record in the data table. 6. When you have finished timing, use a meter stick to measure the length of the string from where it leaves the pen to the stopper. This is your RADIUS _______________________. 7. Repeat for a total of 5 trials, using more weight (washers) each time. Data Table Trial Centripetal Force (Weight of Washers) Time for 10 Revolutions 1 2 3 Avg Avg. Time for 1 Revolution Velocity Calculated Mass of Stopper 1 2 3 4 5 Calculations/Conclusions 1. Calculate the tangential velocity of the stopper for each trial and record in the Data Table Show work for ONE trial 2. Determine the mass of your stopper for EACH trial and record in the Data Table. Use the centripetal force equation you derived in pre-lab #10, and the radius you measured in procedure #6. Show work for ONE trial. 3. Average all of the masses found in #2 above to get one AVERAGE MASS of the stopper. 4. Calculate your % error using the actual (theoretical) mass of the stopper measured in step 1 of the procedure and the average (experimental) mass found in step 3 above.