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WORK AND THE WORK-ENERGY THEOREM PRACTICE PROBLEMS
1. You push a box 2.00 m along a horizontal tabletop with a horizontal force of 3.00 N. The opposing force of friction
is 0.800 N.
How much work does your 3.00 N force due on the box?
What is the work done by the friction
What is the total work done on the book?
force?
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2. You push a 10.0 kg box 2.00 m along a horizontal tabletop with a horizontal force of 20.0 N. The coefficient of
How much work does your 20.0 N force due on the box?
What is the work done by the
friction is 0.100.
What is the total work done on the book?
friction force?
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3. A factory worker pushes a 20.0 kg crate a distance of 5.00 m along a level floor at constant velocity by pushing
What magnitude of
horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.200.
How much work is done on the crate by this force?
How much work is done on
force must the worker apply?
How much work is done by the normal force? By gravity?
What is the total work done
the crate by friction?
on the crate?
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4. A factory worker pushes a 20.0 kg crate a distance of 5.00 m along a level floor at constant velocity by pushing
downward at an angle of 30 below the horizontal. The coefficient of kinetic friction between the crate and the floor is
What magnitude of force must the worker apply?
How much work is done on the crate by this force?
0.200.
How much work is done on the crate by friction?
How much work is done by the normal force? By gravity?
What is the total work done on the crate?
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5. A factory worker pushes a 20.0 kg crate a distance of 5.00 m along a level floor at constant velocity by pushing
upward at an angle of 30 below the horizontal. The coefficient of kinetic friction between the crate and the floor is
What magnitude of force must the worker apply?
How much work is done on the crate by this force?
0.200.
How much work is done on the crate by friction?
How much work is done by the normal force? By gravity?
What is the total work done on the crate?
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6. A physics professor exerts a horizontal force of 10.0 N with his hand and pushes a 5.00 kg box a distance of 3.00 m
magnitude of the work done by the student and
velocity of the box at
across a frictionless floor. Calculate the
the 3.00 m mark.
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7. A physics professor exerts a horizontal force of 10.0 N with his hand and pushes a 5.00 kg box a distance of 3.00 m
across a horizontal distance. The coefficient of kinetic friction between the floor and the box is 0.100. Calculate the
magnitude of the work done by the student and
velocity of the box at the 3.00 m mark.
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8. A physics professor exerts a force of 10.0 N upward at an angle of 15 above the horizontal with his hand and
pushes a 5.00 kg box a distance of 3.00 m across a horizontal distance. The coefficient of kinetic friction between the
magnitude of the work done by the student and
velocity of the box at
floor and the box is 0.100. Calculate the
the 3.00 m mark.
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9. An object of mass 1.00 kg traveling at 5.00 m/s enters a region of ice where the coefficient of kinetic friction is
0.100. Use the work-energy theorem to determine the distance the object travels before coming to a halt.
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10. A object with mass 8.00 kg moves in a straight line on a frictionless horizontal surface. At one point in its path, its
speed is 4.00 m/s; after it has traveled 2.50 m beyond this point, its speed is 6.00 m/s. Use the work-energy theorem to
find the force acting on the object, assuming that this force is constant and that it acts in the direction of the object’s
motion.
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