Name _____________________________________ Period _________
Due Friday, Sept. 18th
Balanced and Unbalanced Forces / Speed / Velocity / Acceleration
Homework #2
1. Two boys are pushing a box. Boy A applies a force of 1000 Newtons to the right on the box. Boy B applies a
force of 3000 Newtons in the same direction.
a. Draw arrows showing the individual forces that are applied to the box.
b. What is the combined force (net force) on the box? _____________________
c. Are the forces balanced or unbalanced? _______________________________
2. Now suppose that Boy A exerts a force of 3000 Newtons to the right on the box and Boy B exerts a force of
5000 Newtons in the opposite direction.
a. Draw arrows showing the individual forces that are now applied to the box.
b. What is the combined force (net force) on the box? ______________________
c. Are the forces balanced or unbalanced? _______________________________
3. A boy is taking his dog for a walk. The dog is pulling with a force of 30N to the right, and the boy is pulling
backwards with a force of 18N. What is the net force in this situation?
a. Net Force = ______________________
b. Are the forces balanced or unbalanced? _________________________
4. Frankie and Caitlin are trying to move a small 4-wheeler out of their garage. Frankie pushes with a force of
40N towards the outside. Caitlin pulls with a force of 20N towards the outside. What is the net force on the
4-wheeler?
a. Net Force = ______________________
b. Are the forces balanced or unbalanced? __________________________
Use the picture to the right to answer # 5 – 10.
Circle your answers.
1000 N
5. The forces shown above are PUSHING / PULLING forces.
6. The forces shown above are WORKING TOGETHER / OPPOSITE FORCES.
7. The forces are EQUAL / NOT EQUAL.
8. The forces DO / DO NOT balance each other.
9. The net force is 1000 N TO THE RIGHT / 1000 N TO THE LEFT / ZERO.
10. There IS / IS NO motion.
1000 N
Below is a diagram that shows the four forces that are acting on an airplane. The table below the diagram
explains what happens when one force is greater than the opposing force that it is paired with. (Lift is always
paired with weight and thrust is always paired with drag)
11. An airplane has a weight of 100,000 N and a lift force of 75,000N.
a. What is the combined force (net force) on the airplane? ___________________________
b. Are the forces balanced or unbalanced? _________________________________
12. An airplane has a thrusting force of 200,000 N and a drag force of 23,000 N.
a. What is the combined force (net force) on the airplane? ___________________________
b. Are the forces balanced or unbalanced? _____________________________
13. A plane left Greenville at 1:00PM in route to Las Vegas. Las Vegas is 1000 miles from Greenville. If a
plane is traveling 200 mph and it has been flying for 4 hours, how many miles are left before the plane reaches
Las Vegas?
Answer: ___________
14. What is the speed of a car if it travels 100 miles in 2 hours?
Answer: ___________
How do you make this speed a velocity? ___________________________________________________
15. Identify if the statement is an example of speed (S), velocity (V) or acceleration (A).
_____ a. Frank Billingsley reports a storm is moving north at 60 miles per hour.
_____ b. A car travelling at 60 mph on I-45 exits onto 610W.
_____ c. A cheetah is chasing a gazelle at 30.5 meters per second.
_____ d. The eight ball slowed a stop just shy of the corner pocket.