Name:_________________________________
Period:____________
Date:___________
Newton’s Second Law and Net Force
[CW]
Points ________ / 50
Directions: Solve the following problems. Show all work for full credit. Each problem is worth 5 points. Be sure to
include labels on your diagrams.
1. A 50 kg cart is being pulled to the right with 25 N of force. Between the cart and the ground, there is 5 N of friction
present.
a) Draw a free-body diagram.
b) Write an “FNET Equation” in the horizontal and vertical directions.
c) Determine the acceleration of the cart.
2. An 80 kg parachuter is accelerating towards Earth. The tension in the parachute strings totals 400 N.
a) Draw a free-body diagram.
b) Write an “FNET Equation” in the horizontal and vertical directions.
c) Determine the acceleration of the parachuter.
3. A crane is lifting a large 2,000 kg beam upwards to be used in constructing a building. The maximum tension the
crane can handle before it breaks is 24,000 N.
a) Draw a free-body diagram.
b) Write an “FNET Equation” in the horizontal and vertical directions.
c) Determine the maximum acceleration the beam may have before the crane breaks.
4. A 40 kg child is sitting on a 20 kg sled. The child and sled are being pulled through the snow with 30 N of force but the
wet snow provides a small amount of friction. If the child-sled system accelerates at 0.3 m/s2, determine the force of
friction present between the sled and the ground.
a) Draw a free-body diagram.
b) Write an “FNET Equation” in the horizontal and vertical directions.
c) Determine the magnitude (amount) of the frictional force present.