University:
Campbell University
Course:
PHYS 222 | General Physics II
Academic year:

2024
Views:

312

Pages:

2
Author:

woody69cdc

Name - ________________________ Kinetic and Potential Energy Determine whether the objects in the following problems have kinetic or potential energy. Then choose the correct formula to use: 𝑚𝑣 𝑲𝑬 𝑷𝑬 𝑚𝑎𝑠𝑠 𝐸𝑛𝑒𝑟𝑔𝑦 𝑔𝑟𝑎𝑣𝑖𝑡𝑎𝑡𝑖𝑜𝑛𝑎𝑙 𝑎𝑐𝑐𝑒𝑙𝑒𝑟𝑎𝑡𝑖𝑜𝑛 𝐽 𝑊𝑒𝑖𝑔ℎ𝑡 9.81 𝑁 𝟐 ℎ𝑒𝑖𝑔ℎ𝑡 OR 𝑀𝑎𝑠𝑠 𝐺𝑟𝑎𝑣𝑖𝑡𝑎𝑡𝑖𝑜𝑛𝑎𝑙 𝑎𝑐𝑐𝑒𝑙𝑒𝑟𝑎𝑡𝑖𝑜𝑛 𝑷𝑬 𝑘𝑔 𝑊𝑒𝑖𝑔ℎ𝑡 𝐻𝑒𝑖𝑔ℎ𝑡 𝑉𝑒𝑙𝑜𝑐𝑖𝑡𝑦 9.81 𝟐) 1.) You serve a volleyball with a mass of 2.1 𝑘𝑔. The ball leaves your hand with a speed of 30. . The ball has ___kinetic___ energy. Calculate it. 𝑚𝑣 Answer - 𝐸 𝐸 2.1 30 𝐸 945 𝐽 2.) A baby carriage is sitting at the top of a hill that is 21 𝑚 high. The carriage with the baby weighs 12 𝑁. The carriage has ___Potential___ energy. Calculate it. Answer - 𝐸 𝑚𝑔ℎ 3.) A car is traveling with a velocity of 40. Calculate it. Answer - 𝐸 𝑚𝑣 𝐸 9.81 21 . 𝐸 252 𝐽 and has a mass of 1120 𝑘𝑔. The car has ___kinetic___ energy. 𝐸 1120 40 𝐸 896 000 𝐽 4.) A cinder block is sitting on a platform 20. 𝑚 high. It weighs 79 𝑁. The block has ___Potential___ energy. Calculate it. Answer - 𝐸 𝑚𝑔ℎ 𝐸 9.81 20 𝐸 1 580 𝐽 . 5.) There is a bell at the top of a tower that is 45 𝑚 high. The bell weighs 190 𝑁. The bell has ___Potential___ energy. Calculate it. Answer - 𝐸 𝑚𝑔ℎ 𝐸 . 9.81 45 𝐸 8 550 𝐽 1 6.) A roller coaster is at the top of a 72 𝑚 hill and weighs 966 𝑁. The coaster (at this moment) has___Potential___ energy. Calculate it. Answer - 𝐸 𝑚𝑔ℎ 𝐸 9.81 72 . 𝐸 69 552 𝐽 7.) What is the kinetic energy of a 3.0 𝑘𝑔 ball that is rolling at 2.0 ? Answer - 𝑚𝑣 𝐸 𝐸 3.0 2.0 𝐸 6.0 𝐽 8.) Two objects were lifted by a machine. One object had a mass of 2.0 𝑘𝑔, and was lifted at a speed of 2.0 . The other had a mass of 4.0 𝑘𝑔 and was lifted at a speed of 3.0 . a. Which object had more kinetic energy while it was being lifted? Answer - 𝐸 𝑚𝑣 𝐸 2.0 2.0 𝐸 4.0 𝐽 Answer - 𝐸 𝑚𝑣 𝐸 4.0 3.0 𝐸 18 𝐽 <-- More b. Which object had more potential energy when it was lifted to a distance of 10. 𝑚? Show your calculation. Answer - 𝐸 𝑚𝑔ℎ 𝐸 2.0 9.81 10. 𝐸 192.20 𝐽 𝐸 𝑚𝑔ℎ 𝐸 4.0 9.81 10. 𝐸 392.40 𝐽 9.) A 3.0 𝑘𝑔 briefcase is dropped. If this briefcase reaches the floor at a speed of 3.2 , from what height was it dropped? Answer - 𝐸 𝐸 𝐸 𝑚𝑣 𝐸 30.72 3.0 3.0 3.2 𝐸 9.81 ℎ ℎ 30.72 𝐽 1.04 𝑚 10.) A water balloon 0.250 𝑘𝑔 was dropped from the edge of a 8.0 𝑚 cliff. How fast was is moving as it hit the ground? Answer - 𝐸 𝑚𝑔ℎ 𝐸 0.250 9.81 8.0 𝐸 19.63 𝐽 𝐸 𝐸 19.62 0.5 0.250 𝑣 𝑣 12.53 2

Two Objects are Being Lifted by a Machine

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