Vocab
Time matters for which of the two (work/power)
Power
A 7 kg object is motionless. Calculate kinetic energy.
This type of energy deals with heat
The equation for potential energy is this
PE=mgh
Energy stored in a compressed object.
What is elastic potential energy?
What does work require?
Force and displacement to be in the same direction.
True
What type of energy deals with gamma rays, x-rays, microwaves, & radio waves?
Electromagnetic
Kyle is pushing his physics book away from him across the table. Is work being done?
Yes
Stored energy is known as
What is potential energy?
True or False: Running and walking up the stairs require the same amount of work
True
What is mechanical energy?
This type of energy takes into account the height due to the gravitational field
Gravitational Potential Energy
The force due to gravity is measured in Newtons. What 2 letters would this take the place of while calculating potential energy?
m (mass) & g (gravity)
True or False. (Assume masses are equal.) You and me both lug our books up a flight of steps. You get up there in 1 minute while it takes me 1.5 minutes. I am more powerful than you.
False
Energy of motion
What is kinetic energy?
This type of energy is from the movement of electrons
Electrical
The deformation of a ball is this type of energy
Elastic Potential Energy
A unit of power which equals to one joule per second
The Watt?
Students do 75 Joules of work to push a table. How much energy was used by the students?
75 Joules
What type of energy is visible light
Electromagnetic
This type of energy is from the breaking of bonds from compounds
Chemical
Steph is carrying her book across the room by balancing the book steady on her hand. Is work being done?
No