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chapter4studyguide
the greater mass a moing object has
| Question | Answer |
|---|---|
| The greater mass a moving object has | the more kinetic energy it has |
| A book and a feather sitting next to each other have | different potential energies |
| Height is NOT used to calculate | kinetic energy |
| Speed is NOT used to calculate | potential energy |
| The potential energy of an object increases | with its height |
| The kinetic energy of an object increases as its speed | increases |
| Green plants convert light energy from the sun into | chemical potential energy |
| The mechanical energy of a coconut falling from a tree remains | constant |
| Gravitational potential energy depends on the mass and height and of the object and due to | gravity |
| The primary source of sun's energy is | nuclear fusion |
| Mechanical energy is the total amount of _____ and ________ energy in a system | kinetic and potential |
| Energy is the ability to | cause change |
| ______________ is stored energy due to position | potential energy |
| ______________ is energy in the form of motion | kinetic energy |
| The law of conservation of energy states that energy cannot be ________ or __________ | created or destroyed |
| _______ is the unit used to measure energy in food | calorie |
| __________________ is energy stored in chemical bonds | chemical potential energy |
| ________________ is energy stored by thing that stretch or compress. | elastic potential energy |
| ___________ is energy stored by things that are above earth. | gravitational potential energy |
| The SI unit of energy is a | joule |
| Friction causes some mechanical energy to change to | thermal energy |
| Calculate the kinetic energy of a 100 kg cart moving at a speed of 7m/s. | 2,450 Joules |
| Calculate the potential energy of a 10 kg sack of groceries on a shelf 1 m above the floor. | PE = mgh = 10*9.8*1 = 98 Joules |
| What is the kinetic energy of a ball at the top of its flight? | 65 joules |
| What is the potential energy of a 2 kg ball at the top of its flight if it is 100 m from the ground? | 4 |
| What is the mechanical energy of the ball from problem 29? | 47 |
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Katwill678
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