Calculating Energy
A 2 kg object moving at 3 m/s has this amount of kinetic energy.
9 J
When energy is converted from one form to another, the system/device must follow the Law of Conservation of Energy. This means that the total mechanical energy of the system will...
stay the same
The total mechanical energy of an object can be found by...
combining an object's kinetic and potential energy
In order to make energy conversion more efficient, you must limit the loss of _____ energy due to friction.
heat/thermal
This form of mechanical energy is stored in objects.
potential energy
A 5 kg object lifted 2 meters (g = 9.8 m/s²) has this much potential energy.
98 J
In a wind turbine, ______ energy is converted to _______ energy.
kinetic, electrical
A skateboarder starts at the top of a ramp with a total mechanical energy of 8,000 J. As they move down the ramp, they have 5,500 J of kinetic energy. How much gravitational potential energy do they have at this point?
2,500 J
You could say a flashlight is "energy efficient" if it takes less battery power to produce more _____.
light/radiant energy
A stretched slingshot just before release has this type of mechanical energy.
potential (elastic)
An object has a mass of 2 kg and 98 J of gravitational potential energy. How high is it above the ground? (g = 9.8 m/s²)
5 m
In a hydroelectric dam, _______ energy is converted to _______ energy.
kinetic, electrical
If there is no friction acting upon a moving object, it can be assumed that the object will...
remain in motion
You could say a stove is "energy efficient" if it takes less time to create more ________.
heat/thermal energy
What is the gravitational potential energy of an object on the ground?
0 J
If velocity doubles, kinetic energy __________.
quadruples
If a moving object comes to a stop due to friction, all of the kinetic energy is converted into _______ energy.
heat/thermal
You fling a rubber band at your classmate's face. As the stretched rubber band flew through the air, it was converting its ________ energy to _________ energy.
potential, kinetic
You are observing two different ceiling fans and trying to decide which one is more energy efficient. What could you observe to see which fan is more energy efficient?
which fan's blades are moving faster
At the bottom of a hill, all of a rollercoaster's mechanical energy is in this form:
kinetic energy
An object has a mass of 4 kg and 200 J of kinetic energy. Find its velocity.
10 m/s
If a moving object comes to a stop without any frictional force, all of the kinetic energy is converted into ________ energy.
potential/stored
As a rock climber climbs to the top of a rock wall, ______ energy increases. As the rock climber lowers themselves back down to the ground, ________ energy increases.
potential, kinetic
Thermal energy will continue to be transferred between objects until they reach...
thermal equilibrium
What happens to the kinetic energy of a moving object when it collides with other object?
It is transferred to the other object