Drydenphysicsb.weebly.com



Work, Power, and EnergyWorksheet 2012-20131. A 500.-newton girl lifts a 10.-newton box vertically upward a distance of 0.50 meter. The work done on the box isA. 2500 JB. 50. JC. 250 JD. 5.0 J19900905441952. The diagram below shows a 5.0-kilogram mass sliding 9.0 meters down an incline from a height of 2.0 meters in 3.0 seconds. The object gains 90. joules of kinetic energy while sliding. What work is done on the object?A. 0 JB. 45 JC. 8 JD. 90. J3. If a force of 100 newtons was exerted on an object and no work was done, the object must have —A.gained momentumB. remained motionlessC. decreased its velocityD. accelerated rapidly4. How much work is performed when a 50 kg crate is pushed 15m with a force of 20 N?A. 750 JB. 300 JC. 1,000JD. 15,000 J5. What is the type and amount of energy in a wrecking ball weighing 100 pounds suspended 100 feet above the ground?A.Accumulative energy of 1,000 lbs/ftB.Potential energy of 10,000 ft. lbsC.Kinetic energy of 5,000 ft. lbsD.Floatational energy of 1,000 lbsE.Weight energy of 10,000 lbs?6. How could you increase the potential energy of the water in the tower?A. Increase the height of the tower.B. Increase the number of filters in the water tank.C. Increase the pipe’s diameterD. Increase the valve opening at the end of the pipe. ?3286125486307. What is the potential energy of the rock?A. 59,900 joulesB. 64,600 joulesC. 121,600 joulesD. 93,100 joulesData showing typical ball speeds and striker speeds for different sports: Ball type?Ball massBall velocityStriker velocityImpact time(kg)(m/s) before(m/s) after(m/s) after(m/s) before(ms)Tennis ball0.05805138334.0Squash ball0.03204944343.0Hand ball0.06102319141.4Golf ball0.04606945328.0Football kick0.4202818128.0Cricket ball0.1603931271.4(Data taken from : Physics, R. Hutchins, University of BATH, Thomas Nelson & Sons Ltd., 1992)?8.Find the kinetic energies of each ball just after it is struck. (12pts) 9.Find the loss in kinetic energy of the golf driver as it hits the golf ball. (2pts) 10.An airplane drops 400 m to escape some freezing rain. If it maintained the same speed but lost 200,000,000 J of energy:?A. How much PE did it lose?B. How much KE did it lose?C. What is the plane’s mass?D. Since the total energy of the system doesn’t seem to be conserved, explain where the 200,000,000 J went.?During an experiment a group of Physics students drop a 0.250 kg ball from a lab table. Using a Photogate timer for several readings they find that it took the ball an average of 0.306 seconds to hit the floor.?11. What is the velocity of the ball just before it hit the ground? (3 points)12. Find the change in kinetic energy of the ball? (3 points) ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download