Mechanical Energy
Stored energy
What is potential energy?
Someone pushes a large rock down a hill
potential energy --> kinetic energy
Heat energy
Thermal energy
The formula for work
Work = force x distance
TRUE or FALSE: Simple machines reduce the amount of work.
FALSE
Mechanical energy is the sum of __________ and ____________ energy.
potential and kinetic
A car uses fuel to allow someone to drive
chemical energy --> mechanical energy
Two objects pushing and pulling against each other.
Mechanical energy
A book rests on a table. This is why no work is done on the book.
The book is not changing its position/ not moving.
This simple machines uses a fulcrum to redirect a force.
Lever
Anna pulls back on a bow, getting ready to shoot an arrow. This is what forms the mechanical energy in the drawn bow.
Elastic potential energy
Rubbing your hands together
Mechanical energy --> thermal energy
Energy that comes from the sun
Electromagnetic or light energy
Jane pushes a box 15 m down the sidewalk with a force of 200 N. This is how much work is done on the box.
3000 Joules
This decreases the force needed to move an object with a lever.
Moving the fulcrum closer to the object
decreases; increases
Playing the radio
Electrical energy --> Sound energy
Energy stored in a battery
Potential chemical energy
This best describes the relationship between force and distance.
Work
This simple machine helps to increase the mechanical advantage of a person's legs while pedaling a bike.
Wheel and axle
As a rock falls from a mountain, this is what happens to the mechanical energy of the rock.
The mechanical energy stays the same because potential energy is changed into kinetic energy.
Wind turbine used to generate power for your home
Kinetic energy --> Mechanical energy --> Electrical energy
The energy of a stretched spring or stretched rubber band.
Elastic potential energy
These make work easier.
Simple machines
This simple machine is used when opening a jar of pickles.
Screw