What is Energy
Lesson 1
Lesson 1
ENERGY
THE ABILITY TO DO WORK
What is power?
the rate at which work is done
The SI unit for force
Newton
Formula for gravitational potential energy
gravitational potential energy = weight x height
energy and work are measured in ...
joules
KINETIC ENERGY
THE ENERGY AN OBJECT HAS DUE TO ITS MOTION
Which has greater power?
using an elevator or lifting a box to the tenth floor
using the elevator because you can do it faster
The SI unit for height
meter
How are work and energy related?
work is the transfer of energy
Energy is the ability to do work or cause
change
POTENTIAL ENERGY
ENERGY THAT RESULTS FROM THE POSITION OR SHAPE OF AN OBJECT
What is the formula for power?
power = energy transferred / time
Thr Si unit for work
joule
How is power related to energy?
power is the rate at which energy is transferred
Power's the rate at which energy is...
transferred
ELASTIC POTENTIAL ENERGY
THE ENERGY ASSOCIATED WITH OBJECTS THAT CAN BE COMPRESSED OR STRETCHED
How do you calculate kinetic energy?
kinetic energy = 1/2 x mass x speed
Example:\1/2 x 10 kg x (1 m/s)squared = 5kg. m squared /s squared = 1 joule
Ther SI unit for mass
kilogram
What are the 2 basic dinds of energy?
kinetic and potential
A stretched rubber band has -----------energy
elastic potential
What is work?
the transfer of energy
What has greater effect on an objects kinetic energy-doubling the mass or doubling the speed?
doubling the speed because the speed is squared.
The SI unit for energy
joule
a girl who weighs 30 kg is inline skating at a speed of 5 m/s.What is the girl's kinetic energy?
1/2 x 30 kg x (5m/s)squared = 15 kg x 25
m squared/s squared = 375 kg m squared/s squared = 375 joules
A mountain climber at the peak has --------------- energy
gravitational potential energy