Newton’s Law of Motion Worksheet

1.A net force of 9.0 N east is used to push a 20.0 kg object. What is the acceleration of the object?
F=ma
9.0 = 20.0 (a)
a = 9.0/20.0
a= 0.45 m/s^2

2.A 16.0 kg object is accelerated at a rate of 2.0m/S2 by a net force. What is the magnitude of this force?
F=16.0*2.0
F=32 N

3. A 925 kg car accelerates uniformly from rest to a velocity of 25.0 mls south in 10.0 s. What is the net force acting on the car during this time?
F=(925*25)/10
F=2312.5 N to south

4. A net force of 6.6N east acts on a 9.0 kg object. lf this object accelerates uniformly from rest to a velocity of 3.0 m/s east. How far did the object travel and how long did it take?
6.6 = (9.0*3.0)/x
6.6x=9.0*3.0
x=(9.0*3.0)/6.6
x=4.09

5. A 12.0 kg object is pushed with a horizontal force of 6.0 N East across a table. If the force of friction is 2.0 N, what is the acceleration of the object?
6-2=4N
4/12=0.33
a=0.33

6. A 20.0 kg object is pulled horizontally along a level floor with a force of 27.0 N. lf the object is accelerating at a rate of 0.80 m/S2, what is the magnitude of the force of friction?
2*0.80=1.6
27.0-1.6=25.4

7. An object that has a mass of 36.0 kg is pushed along a horizontal surface with a force of 85.0 N. IF the force of friction is 72.0 N, what is the magnitude of the acceleration of the object?
85-72=13
13=36a
13/36=a
a=0.361m/s^2

8. A 7.0 kg object rests on a horizontal frictionless surface. What is the magnitude of the horizontal force that is required to accelerate it at the rate of 2.3 m/s2?
F=7.0*2.3
F=16.1N

9. You are traveling in your car at a velocity of 24.0 mls east when you slam on your brakes. The force of friction on your car tires is 1.80x104 N. IF the mass of you and your car is 1.50x103 kg, how far do you skid before stopping?

10. A 325 N box is sliding down a frictionless inclined plane. lf the inclined plane makes an angle of 30.0° with the horizontal, what is the acceleration along the incline?