A sled plus passanger with total mass m=55.5 kg is pulled a distance d=22.2 m across a horizontal, snow-packed surface for which the coefficient of kinetic friction is uk=0.155. The pulling force is constant and makes an angle θ=30.7 degrees above horizontal. The sled moves at constant velocity.
A sled plus passanger with total mass m=55.5 kg is pulled a distance d=22.2 m across a horizontal, snow-packed surface for which the coefficient of kinetic friction is uk=0.155. The pulling force is constant and makes an angle θ=30.7 degrees above horizontal. The sled moves at constant velocity.
a) Write an expression for the work done by the pulling force in terms of m, g (acceleration due to gravity), θ, uk, and d.
b) What is the work done by the pulling force, in joules?
c) Write an expression for the work done on the sled by friction in terms of m, g (acceleration due to gravity), θ, uk, and d.
d) What is the work done on the sled by friciton, in joules?
e) The work done by the normal force is _____ and the work done by gravity is _____. (Blanks are either negative, zero, or positive)
f) What is the net work, in joules, done on the sled?
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