A box slides down a frictionless incline, gaining speed. The work done by the normal force n⃗ is _______. positive negative zero undefined
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Adi S.
An elevator is lifted vertically upwards at a constant speed. Is the net work done on the elevator negative, positive, or zero? Negative Positive Zero A student in a sled freely slides along the flat ground until friction brings the student to a stop. The frictional force did ___________ net work on the sled/boy. Positive Negative Zero A block that is on a table (not frictionless) is pushed to the left by a force equal to 5N. The block moves to the left over a distance of 1m at a constant speed of 2m/s. We can conclude that the total work done by all forces acting on the object is: Greater than zero Less than zero Equal to zero Cannot be determined A 1200-kg vehicle is moving 30 m/s and moves 75-meters until it is brought to a stop. What was the net force required to bring it to a stop? Note: W = ΔKE, KE = 1/2mv^2 480 N 6 N 96 N 7,200 N 2,700,000 N 540,000 N Work and energy have the same units because... Work opposes energy Whenever work is lost, energy is gained Work is a measurement of the transfer of energy Which statement about work is not true? Whenever an object is moving, work is being done. If a force causes an object to move, work is done. A stationary object has no work being done on it.
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