Energy Basics
What is the definition of energy?
The ability to cause change.
What type of energy is motion energy?
Kinetic Energy
What two things must happen for work to be done?
an object must move, and the motion must be in the same direction as the force.
What is a machine?
A device that makes work easier.
You push with a force of 50 N for 2m. How much work is done?
100 J (50 x 2)
List two forms of energy.
Electrical, Chemical, Thermal, or Radiant
What two factors determine kinetic energy?
mass and velocity
What is the formula for work?
W=FxD
Name one type of simple machine
Lever, pulley, inclined plane, wheel&axle, screw, and wedge
You do 600 J of work in 3 s. What is your power?
What type of potential energy is stored in chemical bonds?
Chemical potential energy.
What type of energy does a ball have when sitting on the edge of a shelf?
Gravitational potential energy
What is the formula for power?
P=W/t
What is the fulcrum
the fixed point a lever pivots on
You push with a force of 25 N for 5 m. How much work is done?
125 J (25 x 5)
What type of energy is stored in something that can stretch or be compressed? (Like a spring)
Elastic Potential Energy
At the highest point of a swing, which energy is at its maximum?
Potential energy
What unit is work measured in?
Joules (J)
Which type of pulley is attached and does not move?
Fixed pulley
You do 300 J of work in 2 s. What is your power?
150 W
According to the Law of Conservation of Energy, can energy be created or destroyed?
No-it can only change forms
At the lowest point of a swing, which energy is at its maximum?
Kinetic energy
What unit is power measured in?
Watts (W)
What simple machine is an inclined plane wrapped around a post?
A machine outputs 300 N of force using 100 N of input force. What is the mechanical advantage?
MA = 3 (Mechanical Advantage= Output/Input)