Student: REVIEW -ENERGY Directions: Select the BEST CHOICE to answer or complete each statement below. 1. Work is done when 2. The unit for work is . 3. To say that an object has energy is the capacity of an object to . 4. is stored energy or energy of position. 5. Energy of motion is 6. is the sum of all the potential and kinetic energies in a system. 7. The total amount of energy in a system is constant means that energy is always when it is changed from one form to another. 8. A running back holding g a football does work on the football when and but does no work by 9. Work done on the football by gravity . 10. Work done on the football by a person by FREE RESPONSE SECTION: Remember to show all work! ! No Work NoCredit! 11. How much kinetic energy does a 5 kg ball have that is moving at 15m/s 12. A 95 kg diver stands on a platform 3 m above the waters surface. How much potential energy does she have? Period:

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Student: REVIEW -ENERGY Directions: Select the BEST CHOICE to answer or complete each statement below. 1. Work is done when 2. The unit for work is . 3. To say that an object has energy is the capacity of an object to . 4. is stored energy or energy of position. 5. Energy of motion is 6. is the sum of all the potential and kinetic energies in a system. 7. The total amount of energy in a system is constant means that energy is always when it is changed from one form to another. 8. A running back holding g a football does work on the football when and but does no work by 9. Work done on the football by gravity . 10. Work done on the football by a person by FREE RESPONSE SECTION: Remember to show all work! ! No Work NoCredit! 11. How much kinetic energy does a 5 kg ball have that is moving at 15m/s 12. A 95 kg diver stands on a platform 3 m above the waters surface. How much potential energy does she have? Period:

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**REVIEW - ENERGY** **Directions: Select the BEST CHOICE to answer or complete each statement below.** 1. Work is done when **a force causes a displacement of an object.** 2. The unit for work is **the Joule (J).** 3. To say that an object has energy is to say that the object has the capacity to **do work.** 4. **Potential energy** is stored energy or energy of position. 5. Energy of motion is **kinetic energy.** 6. **Mechanical energy** is the sum of all the potential and kinetic energies in a system. (Note: Sometimes *total energy* is used, though this can be misleading as it doesn't always encompass all forms of energy like chemical or thermal.) 7. The total amount of energy in a system is constant means that energy is always **conserved** when it is changed from one form to another. 8. A running back holding a football does work on the football when **accelerating it** and **lifting it vertically** but does no work by **carrying it horizontally at a constant speed.** (Assuming no air resistance) 9. Work done on the football by gravity **depends on the vertical displacement. If the ball is moving upwards, gravity does negative work. If the ball is moving downwards, gravity does positive work. If the ball is moving horizontally, gravity does zero work.** 10. Work done on the football by a person by **applying a force and causing displacement in the direction of the force.** **FREE RESPONSE SECTION: Remember to show all work! No Work No Credit!** 11. How much kinetic energy does a 5 kg ball have that is moving at 15 m/s? * Formula: KE = (1/2)mv² * KE = (1/2)(5 kg)(15 m/s)² * KE = (1/2)(5 kg)(225 m²/s²) * KE = 562.5 J Answer: The ball has 562.5 Joules of kinetic energy. 12. A 95 kg diver stands on a platform 3 m above the water's surface. How much potential energy does she have? * Formula: PE = mgh (where g is the acceleration due to gravity, approximately 9.8 m/s²) * PE = (95 kg)(9.8 m/s²)(3 m) * PE = 2793 J Answer: The diver has 2793 Joules of potential energy.

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