Download AP 1 Ch. 4 Review w/answers

Name
Period
Review
Date
Chapter 4
Problems
1. An object of mass 70 kg is accelerated by an unbalanced force of 20 N. What is its acceleration?
2. What is the mass of an object that is accelerated at 25 m/s2 by an unbalanced force of 125 N?
3. A speedboat has a mass of 5.0 x 10 2 kg. It starts from rest and travels 2.0 x 10 2 m in 3.0 s. The boat
undergoes uniform acceleration during the 3.0 s. What is the unbalanced force acting on the boat?
4. A ball acquires a speed of 12 m/s when an unbalanced force is applied for a distance of 0.50 m. If the ball
has a mass of 1.0 kg, what is the unbalanced force that is applied?
5. A 75 kg person traveling at a constant velocity on ice skates experiences an unbalanced force of – 40.0 N.
What acceleration does the person experience?
6. A student has a mass of 68 kg. What is the student’s weight?
Chapter 4
Review
AP Phys. 1
7. A mass of 56 kg has a weight of 504 N on top of a mountain. What is the acceleration due to gravity at
this location?
8. A brick has a mass of 1.2 kg. A force of 5.4 N is needed to move the brick along the floor with a constant
velocity. What is the coefficient of sliding (kinetic) friction?
9. The coefficient of starting (static) friction for wood on wood is 0.55. What is the force of friction of a
wood block of mass 3.5 kg being pulled on a wood floor?
10. A stone weighs 5.4 N. What force must be applied to make it accelerated upward at 3.0 m/s2?
11. A boulder of mass 45 kg is pushed on a surface with a coefficient of sliding (kinetic) friction of 0.85.
What force must be applied to produce an acceleration of 0.20 m/s2?
12. It takes a force of 125 N to lift a stone straight up. This force gives the stone an acceleration of 11.0 m/s2.
Calculate the mass of the object.
Chapter 4
Review
AP Phys. 1
13. A rope is tied around a tree. One person pulls with a force of 40.0 N, north while another person pulls
with a force of 60.0 N, west. What is the resultant force on the tree?
14. Forces of 75 N due north and 105 N due east are acting on a point.
a. What is the magnitude and direction of the resultant force?
b. What is the magnitude and direction of the equilibrant?
15. A child is pulling on the handle of a rake with a force of 45 N at an angle of 50.0 o with the horizontal.
a. What is the horizontal component of the force?
b. What is the vertical component of the force?
Chapter 4
Review
AP Phys. 1
16. A boulder weighing 2.0 x 10 4 N is resting on a hillside with a slope of 37 o.
a. What amount of force tends to cause the boulder to slide down the hill?
b. What amount of force tends to push the boulder into the hillside?
17. The blocks A and B are connected by a piece of string. “B” rests on an inclined plane (k = .200) of
30.0° and “A” hangs vertically. Calculate the acceleration of the system if the mass of “A” is 4.50 kg and
that of “B” is 6.00 kg.
Chapter 4
Review
AP Phys. 1