Show:
Force
Work
Energy
Power
Applied
100
Force due to gravity; attraction to the Earth
What is weight?
100
unit for work
What is Joule (J)?
100
unit of energy
What is Joule (J)?
100
unit of power
What is a watt?
100
A body loses GPE when it ______________.
What is falls?
200
the component, perpendicular to the surface (surface being a plane) of contact, of the contact force exerted on an object by, for example, the surface of a floor or wall, preventing the object from penetrating the surface
What is the normal force?
200
the reason work is a scalar quantity
What is it does not depend on the direction, just the net distance traveled?
200
equation for potential energy
What is PE=mgh?
200
equation for power
What is the rate of work? (work/time)
200
A kid lifts a box 1 m by using a force of 10N. Work done?
What is W=Fd =1 x 10 = 10J?
300
keeps energy within a system; includes gravity, the electromagnetic force, and the spring force
What is a conservative force?
300
formula showing work = ∆KE
What is the work energy theorem?
300
equation for kinetic energy
What is 1/2*mass*(velocity^2)?
300
A 300-Newton force is applied to a skier to drag her up a ski hill 2 meters over a time of 10 seconds. The power delivered by the toe rope is _____ Watts.
What is 60? (w=f*d, so w=600; power is work/time, so 600/10 = 60 Watts)
300
A kid used 50 J of energy to move a box from the floor to the table. How much power did she use if it took her 2 seconds?
What is P=Energy(Work)/Time.... 50/2 = 25 Watts?
400
the units that create a newton
What is meters per second per second * kilogram?
400
In baseball, the catcher exerts an abrupt applied force upon the ball to stop it in the catcher's mitt. This is an example of ______________ work.
What is negative?
400
the total amount of potential and kinetic energy in a system
What is mechanical energy?
400
A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of ____, but different amounts of ____.
What is work, power?
400
A ball is rolling down a slope. It has a mass of 2 kg at a speed of 2 m/s. What is the kinetic energy of the ball?
What is KE=0.5x2x(2x2)=4J?
500
a value that is generally less than one; represented by µ
What is the coefficient of friction?
500
If work is done on an object by a non-conservative force, then the object will either gain or lose potential energy. (True or false and why)
What is false because the object will either gain or lose mechanical energy, but not necessarily potential energy?
500
A falling object always gains kinetic energy as it falls. (True/false and why)
What is false because if an object is falling at a constant velocity (i.e., the air resistance force equals the downward force of gravity), then there is not an increase in kinetic energy. It is true however that free-falling objects always increase their kinetic energy as they fall.
500
one horsepower is equivalent to ______ watts
What is 746?
500
GPE of a 2kg book on a 2 m table?
What is 2x9.8x2=39.2 J?