Energy
What is the unit of energy?
Joules (J)
As an object falls, the energy is converted from ______ to _________.
(Gravitational) Potential Energy --> Kinetic Energy
A measure of the average kinetic energy of particles in a substance is called?
Temperature
What is the unit of work?
Joules (J)
What is the unit of power?
Watts (W)
What type of energy increases if you increase the height of an object?
Potential Energy
A slingshot is pulled back and then released to launch a stone. This converts ________ energy to ___________ energy.
Elastic Potential Energy --> Kinetic Energy
The transfer of heat by direct contact is called?
Conduction
A ball is suspended from a rope on the ceiling. How much work is done by the rope?
0 J. The ball does not move in direction of the force from the rope (upward). It is held at rest.
How much power is done if 3000J of work is done in 15 seconds?
200 W
Increasing the velocity/speed of an object increases what type of energy?
Kinetic Energy
Making a fire using logs converts _______ energy to ________ energy.
Chemical --> Thermal
The transfer of heat by movement of heated particles is called?
Convection
A car is towed 20m by a truck using 8000N of force. How much work was done by the truck?
160,000 J
550W of power is used in 32 seconds. How much work was done during that time?
17,600 J
1481.76 J
A speaker uses _________ energy to produce _________ energy.
Electric --> Sound
Transfer of heat by electromagnetic waves is called?
A crane does 3000J of work to lift a crate that weighs 500N. How high is the crate lifted?
6 m
575W of power is used to do 7475J of work. How long does this process take?
13 seconds
A 0.15kg toy car rolls down a ramp. At the bottom of the ramp, the car has a velocity of 1.2m/s. What is the kinetic energy of the car at the bottom of the ramp?
0.108 J
Energy that is reflected or emitted from objects in the form of waves that can travel through space is called what?
Electromagnetic energy
20kg of hot iron cools down from 90°C to 25°C. The specific heat of iron is 451 J/kg°C. How much thermal energy was released from the iron as it cooled?
-586,300 J
1500J of work is used to lift a book half a meter. What is the weight of the book?
3000 N
How much power will a crane need to use to lift a 2000kg car 10m upward in 50 seconds?
3920 W