CP PHYSICS
FORCE PROBLEMS II
Name: ______________________________________
____ period
Solve the following problems. Draw the free body force diagrams and use GUESS!!!!
1.
An object is acted on by two perpendicular forces. One force pulls the on the object 60 N, north. The
second force pulls the object 40 N, east. What is the resultant force acting on the object? What
equilibrant force is needed to keep the object in equilibrium and at rest?
2.
Two forces act on an object simultaneously. One force pulls the object 80 N, south. The other force
pulls the object with 135 N, west. What is the resultant force acting on the object? What equilibrant
force will keep the object at rest?
3.
A 58 kg box of lab supplies is pushed across a long laboratory station. The teacher applies a force
of 133 N to keep the box moving at a constant velocity. What is the coefficient of friction between
the box of lab supplies and the lab station surface?
4.
A 425 N boy stands on a 20 N skateboard. He moves over a rough, cement sidewalk. The coefficient
of friction between the skateboard and the sidewalk is 0.82. What force must be applied to the boy
on the skateboard for it to move at a constant velocity?
5.
A 312 kg cart full of laboratory supplies is pushed down a hall. If the teacher uses a force of 675 N
to cause the cart to accelerate at 0.13 m/s 2 down the hall, what is the force of friction experienced?
CP PHYSICS, FORCE PROBLEMS II, page 2
6.
A 284 kg cart containing laptops is pushed down a hall. If a force of 715 N is used to push the cart
down the hall at a constant velocity, then what is the coefficient of friction between the cart and the
floor?
7.
A 428 kg balloon is sent straight upwards into the air with a force of 5200 N. What upward acceleration
will the balloon have?
8.
A 48 kg girl skates across a pond of ice. If the coefficient of friction between the ice and her skates is
0.13, what force of friction acts on her as she skates across the pond at a constant velocity?
9.
A 178 kg chair being pushed up a moving ramp experiences a frictional force of 91 N. What force
must be applied to the chair to give it an acceleration of 0.55 m/s 2?
10.
A 1200 N rocket is sent straight up into the air. The upward force applied to the rocket is 3300 N.
What is the upward acceleration experienced by the rocket?
BONUS: A crate is pushed across the floor with an acceleration of 0.27 m/s 2. The crate experiences a frictional
force of 118 N while an applied force of 135 N is used to move the crate. What is the crate’s mass?