Download Force Practice Problems

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Force Practice Problems
1.
A horizontal force of 100 N is required to push a crate across a floor at a constant speed. What is
the net force acting on the crate?
2.
A person is pushing against a piano on a hill to keep it from sliding down
and hill and crashing. What is the net force acting on the piano?
3.
Draw a free-body diagram of a 2kg book sitting on a table.
4.
If a book has a mass of 2kg, what will the normal force equal? (hint: look at your answer from
question #3)
5.
A horizontal force of 100N is required to push a crate across a floor at a constant speed. What is
the force of friction acting on the crate? (hint: draw a free-body diagram)
6.
If you push horizontally on a 10kg book with a force of 20N to make the book slide at constant
velocity, what is the normal force acting on the book? (hint: draw a free-body diagram)
7.
What is the acceleration caused by a net force of 2N on a 2kg mass?
8.
Calculate the force required by the engines of a 20,000kg jet to take off at an acceleration of 8m/s2.
9.
What is the acceleration of a 747 jumbo jet (300,000kg) in takeoff when the thrust of its engines is
120,000N?
10. Calculate the mass if you push a block on a horizontal friction-free table with a 20N horizontal
force at 10 m/s2.
11. Calculate the acceleration of a 40kg crate when it is pulled sideways with a net force of 200N.
12. A certain force applied to a 2kg mass accelerates the mass at 3 m/s2. How much acceleration will
the same force produce on a 4kg mass?
13. Calculate the horizontal force that must be applied to a 1kg puck to make it accelerate on a
horizontal friction-free table with the same acceleration it would have if it were dropped and fell
freely.
14. Calculate the horizontal force that must be applied to produce an acceleration of 1.8m/s2 for a
1.2kg puck on a horizontal friction-free table.