Download Unit 4 Review - Clayton School District

Unit 4, More About Forces
Review
Name_______________________________
Date__________________Period________
1. Newton’s Third Law says that if object 1 pushes on object 2 and object 2 accelerates, then the push
on object 1 by object 2 is (greather than, less than, equal to) the push on object 2 by object 1.
2. If object 1 pushes on object 2 and object 2 moves at constant speed, then the push on object 1 by
object 2 is (greather than, less than, equal to) the push on object 2 by object 1.
3. A boy stands on the earth and jumps upward. While he is still in contact with the ground, he
accelerates upward. Draw a force diagram for the boy and a force diagram for the earth. Mark the
Newton’s Third Law pairs.
4. Two teams play tug-of-war with a rope. Team A beats Team B. The tension force on Team A is
(greater than, less than, equal to) the tension force on Team B.
5. Two students decide to do an experiment to find out what happens to the acceleration when you
change the net force. List the Independent Variable, the Dependent Variable, and the important
Constants in the experiment. What would a graph from the experiment look like? What is the
physical significance of the slope of the graph?
6. Two students decide to do an experiment to find out what happens to the acceleration when you
change the mass of the system. List the Independent Variable, the Dependent Variable, and the
important Constants in the experiment. What would a graph from the experiment look like? What is
the physical significance of the slope of the graph?
7. State the relationship between acceleration and net force. If an object accelerates 3 m/s/s when the
net force is 12N, what is the acceleration when the net force is 36N?
8. State the relationship between acceleration and mass. If an object accelerates 3 m/s/s when the mass
is 12kg, what is the acceleration when the mass is 36kg?
9. A woman stands on a scale on an elevator. The woman’s mass is 50 kg. The scale reads 600N.
Describe the motion of the woman (there are two possible answers)
10. A 2000 kg airplane is pushed forward by a thrust force of 25,000 N. It accelerates at 8 m/s/s. What
is the size of the drag force on the airplane.
11. An object is dropped from a height of 45 m. How fast is it going when it hits the ground?
12. An arrow is fired straight up at a speed of 40 m/s. What is its maximum height?
13. How fast will the arrow be moving when it is 55 m above the ground?
©Modeling Workshop Project 2006/A TIME for PHYSICS FIRST
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Unit 4 Review v1.12