Aim 3536.notebook
January 28, 2016
January 26, 2016
Aims #35-36-What is energy?
What are some examples of energy in your everyday life? What gives you energy to be
active?
Energy-the ability to do work, the ability to cause change
To calculate kinetic energy:
kinetic energy (joules) = 1/2 mv2
Practice Problems:
1. What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has a
mass of .15kg?
Different forms of energy
2. A car moving at a speed of 20m/s has a kinetic energy of 300,000J. What is the car's mass?
3. A sprinter has a mass of 80kg and a kinetic energy of 4000J. What is the sprinter's speed?
Nov 12-8:45 AM
Jan 26-8:51 AM
To calculate gravitational potential energy:
GPE = mgh
Practice problems:
1. Find the height of a baseball with a mass of .15kg that has a GPE of 73.5J.
2. Find the GPE of a coffee mug with a mass of .3kg on a 1m high counter top.
3. What is the mass of a hiker 200m above the ground if her GPE is 117,600J?
Jan 26-8:55 AM
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