Units
the unit for height
meters (m)
What is kinetic energy?
the energy of motion
Definition of potential energy
stored energy
Energy stored in chemical bonds
Chemical Energy
an energy source that exists in limited quantities and, once used, cannot be replaced except over the course of millions of year
nonrenewable energy
The unit for velocity
m/s
How much energy does a 4 kg apple have that is thrown at a speed of 2 m/s?
8 J
how much energy does a bird have that has a mass of 9kg and is sitting on a branch 3 m high? (remember, gravity =9.8m/s2)
265 J
the energy associated with electric charges.
Electrical energy
resources that can be replaced in a relatively short period of time.
renewable energy
The unit for mass when we are calculating energy
kilograms (kg)
What is the energy of a 25kg object that is moving at a velocity of 10 m/s?
1,250 J
What is the energy of a 2.5 kg picture that is sitting on a shelf 6 meters off the ground? (remember gravity = 9.8m/s2)?
147 J
the sum of the kinetic and potential energy in a system.
Mechanical energy
energy that is obtained from flowing water
hydroelectric energy
The unit for the acceleration due to gravity
m/s2
What is the kinetic energy of a 150 g (*convert to kilograms!) object moving at a velocity of 100m/s?
750 J
When an object gets further from the ground, it's potential energy ___________?
increases
energy stored in the nucleus of an atom
Nuclear Energy
thermal energy beneath Earth's surface
geothermal energy
The unit for energy
Joules (J)
If two objects have the same mass, which object has more kinetic energy?
The object going faster or the object going slower?
Faster
twice (2x)
the total energy of motion in the particles of a substance.
thermal energy
finding ways to use less energy or to use energy more efficiently
energy conservation