The energy of an object due to the object's motion
What is kinetic energy
100
only a portion of the work done by any machine is
What is useful work
100
A man hits a golf ball 0.3kg which accelerates at a rate of 15 m/s^2. What amount of force acted on the ball ?
What is 4.5N
200
A quantity measured the rate at witch work is done or energy is transformed
What is power
200
Simple machines are divided into two families what are they
What is the lever family and the inclined plane family
200
The amount of work an object can do because of the object's kinetic and potential
What is machanical energy
200
useful work output / work input
What is efficiency equation
200
Imagine a father playing with his daughter by lifting her repeatedly in the air. How much does he do with each lift if he lifts her 2.0m and exerts an average force of 190N ?
What is 380J
300
only when force is applied to an object and the object moves in the same direction as the applied force
What is work
300
All levers have a rigid arm that turns around a point called
What is fulcrum
300
Energy that lies at the level of the atom is sometimes called
What is nonmechanical energy
300
a quantity usually expressed as a percentage ,that measures the ratio of useful work output to work input
What is efficiency
300
calculate the mechanical advantage of a ramp that is 5.0m long and 1.5m high
What is 3.3
400
Work / Time
What is the power equation
400
Bicycles and cars are made up of
What is compound machines
400
Energy that does not involve the large-scale motion or the position of objects in a system is called
What is potential energy
400
Energy cannot be created or destroyed
What is the law of conservation of energy
400
A 65kg rock climber ascends a cliff. what is the climber's gravitational potential energy at a point 35m above the base of the cliff?
What is 2.2x10^4 J
500
Lifting an elevator 18m takes 100kj. If doing so takes 20s what is the average power of the elevator during the process
What is 5kw
500
list 3 of the 6 type of simple machines
What is the simple lever, the pulley, the wheel and axle, simple inclined plane, the weage, the screw