Vocabulary
What units are used to measure force?
Newtons
A student pushes against a pull door with 150 N of force. It does not move. How much work are they doing?
0 J
A woman on a skateboard is jumping over a shark tank using a ramp. She starts down the ramp at 100 m, and the jump happens at 20 meters. She lands at 20 meters again, where she gradually slows to a stop.
Where is her potential energy the greatest?
100 m
A woman on a skateboard is jumping over a shark tank using a ramp. She starts down the ramp at 100 m, and the jump happens at 20 meters. She lands at 20 meters again, where she gradually slows to a stop.
Where is her potential energy the greatest?
20 meters (or just before)
What formula would you use to find total mechanical energy, when given kinetic and potential energy?
Ep+Ek=TME
What units are used to measure work and energy?
Joules
A student pushes a box with 150 N of force for 5.5 meters. What work was exerted?
825 J
If a ball has a kinetic energy of 259 J, and a total mechanical energy of 3,333 J, what is the ball's potential energy?
3,074 J
If a rock has a total mechanical energy of 10,780 J and a potential energy of 3,264 J, what is the kinetic energy of the rock?
7,516 J
What formula would you use to find gravitational potential energy?
Ep=mgh
This type of energy increases as your velocity increases
Kinetic Energy
A 18-kg dumb bell is lifted 0.2 meters directly upwards by a student on earth. What is the work done by the student on the dumb bell
35.28 J
A trapeze artist is 20 meters in the air on a rope on earth. They have a mass of 60 kg. What is that trapeze artist's potential energy?
11,760 J
Sisyphus pushes a rock up a hill. His velocity is 0.5 m/s, and the rock is 22 kg. What is the kinetic energy of the rock moving up the hill?
2.75 J
What formula would you use to find the height of an object, if you know its potential energy, gravity, and mass?
h=(Ep)/(mg)
What do you get when you divide Joules by time?
Watts
A 18-kg dumb bell is lifted 0.2 meters directly upwards by a student on earth. This takes them 1.5 seconds. What is the power exerted by the student on the dumb bell?
23.52 W
If the gravity on Jupiter is 24.79 m/s2, and a spaceship is 52 meters high with a mass of 16,057 kg, what is it's potential energy?
20,698,757.56 J
Sisyphus lets the rock slip by accident at the top of the hill, and it begins rolling down. The rock weighs 22 kg, and has a velocity of 31.3 m/s. What is the kinetic energy of the rock?
10,776 J
What formula would you use to find the kinetic energy of an object when given it's mass and velocity?
Ek=(1/2)mv2
Energy is not created or destroyed, just transferred from one form to another. This is the law of...
A tractor moves itself with 150,474 N of energy for 500 meters over the course of 240 seconds. What is the power of the tractor?
313,487 W
Planet X has an unknown gravity. However, scientists have a 50 kg cube 29.4 meters above the ground. They have measured that this cube has a potential energy of 1667 J. What is the gravity of planet x?
1.13 m/s2
The rock is rolling down a hill with 5,555 J of kinetic energy. It still has a mass of 22 kg. What is the rock's velocity?
22.47 m/s
What formula would you use to find the velocity of an object when given its kinetic energy and mass?
v= root2 [(Ep)/(1/2m)]