Energy
Energy cannot be _______________ or _______________
Created or Destroyed
A 1,400 kg car is travelling at 50m/s, what is its kinetic energy?
1,750,000J
What are the variables that determine potential energy?
mass and height
What is the maximum height of a pole vaulter who weighs 45kg and is running at a speed of 15m/s?
11.48m
Hot dog
Chemical Potential
Something that is moving has __________ energy.
Kinetic
A girl is riding her bike at a velocity of 15m/s. Her bike and herself weight 60kg. What is her kinetic energy?
6750J
What is the potential energy of a ball held 3m in the air with a weight of 8kg.
235.2J
A truck is stopped at the top of a 66m high hill. How fast will it be moving when it reaches the bottom?
35.97m/s
Stretching a hair band
Elastic Potential
Which is not a type of potential energy
Electrical Mechanical Nuclear Chemical
Mechanical
A dog with a mass of 25kg has a kinetic energy of 33J. What is the dog's velocity?
1.62 m/s
At what height is a bird sitting if it weighs 2kg and has a potential energy of 87J.
4.44m
A ball is thrown straight up in the air at 34m/s, how high will the ball go?
58.98m
A running vacuum
Electrical Kinetic
What is a system?
Anything under observation by the observer
A car has a velocity of 65m/s and a kinetic energy of 143,000J, what is its mass?
67.7kg
What is the mass of a ball sitting on ledge 20m above the ground with a potential energy of 1300J?
6.63kg
A rock on the edge of a 98m cliff falls off. What is its velocity as it falls?
43.83m/s
Blasting music
Sound Kinetic
Name the three types of systems.
Open
Closed
Isolated
A bird has a mass of 9kg and a kinetic energy of 1.6x 104J, what is its velocity?
59.63m/s
What is the potential energy of a ant with a mass of 3.2 x 10-2 that is sitting on a railing 1m above the ground?
0.0031
What is the kinetic energy of a 5kg bird flying at a height of 17m?
v= 18.25m/s
Ek= 832.66J
Magnetic potential