The transfer of energy to an object by the application of a force that causes the object to move in the direction of the force.
What is work?
100
The capacity to do work.
What is energy?
100
Work
What is W=Fd
100
A crane uses an average force of 5,200 N to lift a girder 25 m. How much work does the crane do on the girder?
What is 1.3 X 10^5 J or 130,000 J?
100
Energy cannot be created nor destroyed.
What is Law of Conservation of Energy?
200
A quantity that measures the rate at which work is done or energy is transformed.
What is power?
200
The energy that an object has because of the position, shape, or condition of the object.
What is potential energy?
200
Power
What is P=W/t
200
An apple weighing 1 N falls a distance of 1 m. How much work is done on the apple by the force of gravity?
What is 1 J?
200
For any system, the net change in energy equals the energy transferred as work and as heat. When no energy is transferred as heat or as work, mechanical energy is conserved.
What is 1st Law of Thermodynamics?
300
A quantity that expresses how much a machine multiplies force or distance.
What is mechanical advantage?
300
The energy of an object due to the object's motion.
What is kinetic energy?
300
Mechanical Advantage Equation
What is mechanical advantage = output force/input force = input distance/output distance
300
While rowing across the lake during a race, John does 3,960 J of work on the oars in 60 s. What is his power output in watts?
What is 66 W?
300
True or False: Potential energy can shift into kinetic energy and kinetic energy can shift into potential energy.
What is true?
400
One of the six basic types of machines, which are the basis for all other forms of machines.
What is simple machine?
400
The amount of work an object can do because of the object's kinetic and potential energies.
What is mechanical energy?
400
Potential Energy Equation
What is PE = mgh
400
Calculate the gravitational potential energy of a 1,200 kg car at the top of a hill that is 42 m high.
What is 4.9 X 10^5 J or 490,000 J?
400
True or False: No machine is 100% efficient.
What is true.
500
A machine made of more than one simple machine.
What is compound machine?
500
A quantity, usually expressed as a percentage, that measures the ratio of useful work output to work input.
What is efficiency?
500
Kinetic Energy Equation
What is KE = 1/2 mv^2
500
A 35 kg child has 190 J of kinetic energy after he sleds down a hill. What is the child's speed at the bottom of a hill?
What is 3.3 m/s?
500
A process used by nuclear power plants to release energy, by splitting a single large nucleus into two smaller nuclei.