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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 |