A 2-kg object is moving at 3m /s. A 4-N force is applied in the direction of motion and then
removed after the object has traveled an additional 5m. The work done by this force is?
A sledge (including load) weighs 5000N. It is pulled on level snow by a dog team exerting a
horizontal force on it. The coefficient of kinetic friction between sledge and snow is 0 .05. How
much work is done by the dog team pulling the sledge 1000m at constant speed?
removed after the object has traveled an additional 5m. The work done by this force is?
A sledge (including load) weighs 5000N. It is pulled on level snow by a dog team exerting a
horizontal force on it. The coefficient of kinetic friction between sledge and snow is 0 .05. How
much work is done by the dog team pulling the sledge 1000m at constant speed?
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Work = Force x Distance
W = F x d
W = 4 x 5 = 20N-m or 20J
Force of Friction = coefficient of friction x normal force
F = u * Fn = u * Fg = 0.05 * 5000 = 250
W = F x d = 250 * 1000 = 250 000 J
Note that since the force of friction acts in the opposite direction of the motion of the sled, the work done is actually negative, so W = -250 000J
W = F x d
W = 4 x 5 = 20N-m or 20J
Force of Friction = coefficient of friction x normal force
F = u * Fn = u * Fg = 0.05 * 5000 = 250
W = F x d = 250 * 1000 = 250 000 J
Note that since the force of friction acts in the opposite direction of the motion of the sled, the work done is actually negative, so W = -250 000J