Download Physics Force Worksheet

Physics Force Worksheet and Sample Test.
1. A 10.0 gram moving at 400 m/s is brought to a stop in 3.00 cm in a block of wood. Find the force on
the bullet, assuming that it is constant. Compare the force with the weight of a 60.0 kg person.
2. An electron of mass 9.11 x 10-31 kg is accelerated by a constant force along the direction of its motion
from 2 x 106 m/s to 8 x 106 m/s within 2.00 cm. (a) What is the magnitude of the force? (b) How long
did it act?
3. Find the force acting on a 12,500 kg F4 Phantom jet in the following situations: (a) It is catapulted from
rest to 250 km/hr in 2.2 seconds. (b) It is stopped from 180 km/hr by a net within 40 meters.
4. Two blocks with masses m1 = 200 grams and m2 = 300 grams hang one under the other, as shown. Find
the tensions in the (massless) ropes in the following situations: (a) the blocks are at rest; (b) the blocks are
moving upward at 5.00 m/s; (c) they accelerate upward at 2.00 m/s 2; (d) they accelerate downward at 2.00
m/s2. (e) If the maximum allowable tension is 10.0 N, what is the maximum possible upward acceleration?
Assume m1 is the upper mass and m2 is the lower mass.
5. A person of mass 75 kg stands on a scale inside an elevator. What can you infer about the motion of the
elevator if the scale reads (a) 735 N? (b) 600 N? (c) 900 N?
6. Two blocks are connected by a massless rope as shown below. Assume all surfaces are frictionless. If
the suspended mass (m1) is 2.00 kg, for what value of m2 will (a) the acceleration of the system be 4.00
meters per second squared, or (b) the tension in the rope be 8.00 N?
7. A 90.0 kg block is supported by ropes and pulley system, as shown. What are the tensions in the
strings?
36.9
53.1
8. An applied force of 75.0 N is applied to an 25.0 kg object on a horizontal surface. The surface has a
coefficient of kinetic friction of 0.250. What is the acceleration of the object? Assume the object is
moving to the right.
Fa
9. Repeat #8, except have the applied force act at an angle of 36.9 degrees above the horizontal. What is
the acceleration? Assume the object is moving to the right.
Fa
10. Repeat #8, except have the applied force act at an angle of 36.9 degrees below the horizontal. What is
the acceleration? Assume the object is moving to the right.
Fa
11. A block with a mass (m1) of 12.0 kg is placed on a horizontal surface. The surface has a coefficient of
kinetic friction of 0.250. A cord is tied to this mass, and a second mass (m2) of 7.50 kg is attached to the
cord. The second mass is hung over the edge of surface with a frictionless ideal pulley. Find the
acceleration of the system and the tension in the cord if the mass m1 is initially moving towards the right.
m1
m2
12. Atwood,s Machine. Two masses are tied together with a light string and both are suspended from an
ideal pulley, as shown. Find the acceleration of the masses and the tension in the string. The left mass is
12.0 kg and the right mass is 13.0 kg.
m1
m2
13. A mass of 10.0 kg (m1) rests on an incline that makes an angle of 36.9o with the horizontal. A light
cord connects it to a mass m2 hanging over the top edge of the incline. a. What is the mass of m2 if the
system moves at a constant velocity to the top of the ramp? b. What would the mass m 2 be if the system
moves at a constant velocity towards the bottom of the ramp? (c) How would the solutions for (a) and (b)
change if there were a coefficient of kinetic friction of 0.355?
m1
m2