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Phys: Work & Energy

QuestionAnswer
Work is a form of energy True
Watt is standard metric unit of work False
Units of work equal a Newton times a meter True
A [kilogram (meter squared per second squared)] is a unit of work True
Work is a time-based quantity False
Superman applies a force on a truck to prevent it from moving down a hill. Is this work? No
An upward force is applied to a bucket as it is carried 20m across a yard. Is this work? No
A force is applied by a chain to a roller coaster car to carry it up the hill. Is this work? Yes
Force of friction acts upon a softball player as she slides into third. Is this work? Yes
An eraser is tied to a strong; person holds string and applies tension force to move eraser in circle at constant speed. Is this work? No
Force acts upon on object to push along a surface. Is this work? Yes
Force acts upon an object at 90-degree angle for the direction the object is moving. Is this negative work? No
An individual force does NOT do positive work upon an object if object is moving at constant speed False
An object is moving to the right, and the force is to the left. What type of work is this? Negative
Non-conservative force is doing work on an object; it's the only force doing work. The object will either gain or lose mechanical energy. True
Power is a time-based quantity True
Power refers to how fast work is done on an object True
Powerful ppl or machines simply do a lot of work False
A force is exerted on an object to move it a constant speed. Power delivered by force is magnitude of force multiplied by speed of object. True
What is power equation in regards to work? P = W/T
What is power equation in regards to force? P = F*V
Standard metric unit of power is Watt True
If two ppl do a job but person B does it faster, than person A does more work but Person B has more power False
Newton-meter is unit of power False
60kg boy runs 2.0m in 1.5 seconds. His power is ____ Watt? 784 Watt
300-N force applied to skier to drag her at a constant speed of 1.5m/s. Power is _______? 450 Watt
ANGLE: rightward applied force displace to right 0
ANGLE: force of friction acts upon right-moving object to bring to stop 180
ANGLE: applied force to balance weight of plates, moves across room 90
ANGLE: air resistance upon vertically-falling skydiver 180
ANGLE: force of friction on sliding baseball player 180
ANGLE: tension supplies centripetal force to keep water moving in circle 90
ANGLE: applied force acting in 30-degrees to horizontal displaces object to right 30
ANGLE: applied force to push sled 0
ANGLE: tension causes elevator to rise at constant speed 0
ANGLE: applied force exerted parallel to plane inclined at 30-degrees to displace cart up incline 0
ANGLE: applied force exerted upwards and rightwards at angle fo 30-degrees to vertical to displace object to right 60
ANGLE: child swings on a swing supported by tension in cable; swings from high position to low position 90
Created by: Damma15724
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