PHYSICS - work / energy / work - fill in

Applied force, normal force, tension force, friction force, and air resistance force are all ______________ forces and are capable of doing work
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Terms in this set (34)
Applied force, normal force, tension force, friction force, and air resistance force are all ______________ forces and are capable of doing work
external
Gravitational and spring forces are ___________ and do not do work
internal
When net-work is done upon an object by an external force, the total mechanical energy (KE + PE) of that object __________
mechanical
If work is positive work, then the object will ________energy. (gain, lose)
gain
External forces are capable of doing work, so they are sometimes called _____________________ forces. (nonconservative , conservative)
nonconservative
When the only forces doing work upon the objects are internal forces - mechanical energy is _____________.
conserved
energy changing from KE to PE or PE to KE?

A ball falls from a height of 2 meters in the absence of air resistance.
PE to KE
energy changing from KE to PE or PE to KE?

A skier glides downhill from location A to location B across a friction-free ice.
PE to KE
energy changing from KE to PE or PE to KE?

A bungee cord begins to exert an upward force upon a falling bungee jumper.
KE to PE
The work that is done can be positive work or negative work depending on whether the force doing the work is directed opposite the object's motion or in the __________ direction as the object's motion.
same
If the force and the displacement are in the opposite direction, then ____________work is done on the object; the object subsequently loses mechanical energy.negativeIf ____________ work is done on an object by an external force, then the object gains mechanical energy.positiveA horizontal force can never change the ___________ energy of an object.potentialTMEi + Wext = TMEf The equation states that the initial amount of total mechanical energy (TMEi) plus the work done by ____________ forces (Wext) is equal to the final amount of total mechanical energy (TMEf).externalpositive - negative - zero? A weightlifter applies an upwards force of 1000 N to a barbell to displace it upwards .025 meters at a constant speed.positivepositive - negative - zero? A baseball catcher who applies a rightward force of 6000 N to a leftward moving baseball to bring it from a high speed to a rest position over a certain distance.negativeWork is a form of _____________.energypositive - negative - zero? Rusty Nales uses a hammer to exert an applied force upon a stubborn nail to drive it into the wall.positivepositive - negative - zero? A cable is attached to a bucket and the force of tension is used to pull the bucket out of a well.positivepositive - negative - zero? Near the end of the Shockwave ride, a braking system exerts an applied force upon the coaster car to bring it to a stop.negativepositive - negative - zero? A busy spider hangs motionless from a silk thread, supported by the tension in the thread.zero (motionless)the ability to do work.energyrate at which work is donepowerEnergy of motionkineticenergy of positionpotentialpositive negative or none? What kind of work is done if you push against a wallnone (no movement)positive negative or none? What kind of work is done if you push a box across a roompositive (force same as direction)positive negative or none? What kind of work is done if water falls from the top of a damnone (gravity)positive negative or none? What kind of work is done if you lift a brickpositive (force same as direction)positive negative or none? What kind of work is done if you push a child in a wagonpositive (force same as direction)Work is the quantity of ____________ used to move an objectenergyPotential energy results from an object's ________above the groundheightGravitational Potential Energy depends on how _________and _______ of an objectheight and massWhat does the law of conservation of energy state?Energy cannot be created or destroyed