Download Ch 3 semester 2 review study guide

Name: _____________________________________________________Date:___________Per:____________
Forces: Ch 3 Study Guide 
1.
List and define Newton’s 3 Laws of Motion. You must know which one is which for the test.
2. Write the equation for force. Include units and what each letter stands for.
3. Write the equation for momentum. Include units and what each letter stands for.
4. A dog pulls a 10kg box with 20 N of force to the left while two cats pull with a total force of 15 N to the right.
a. Draw a free body diagram
b. What is the net force on the box?
c. Calculate the acceleration of the box.
5. What is an unbalanced force?
6. Circle all of the unbalanced forces:
a. A leaf falling from a tree
b. A car speeding up
c. A motorcycle moving at a constant speed
d. A bike slowing down for a red light
7. A force of 15 N causes a book to accelerate 5 m/s2, what is its mass?
8. How much force will it take for a 5 kg toy train to accelerate at 4 m/s2?
9. What is the acceleration due to gravity on earth? “free falling acceleration”(Round to the one’s place)
10. Calculate the acceleration of a 20 kg object that has 48 N net force applied to it.
11. A car weighs 12,000N on Earth, what is its mass?
12. How much does the same car weigh on Jupiter if the acceleration due to gravity is 25.4 m/s2?
13. Calculate the momentum of a 13kg cart moving at a speed of 3m/s.
14. What is the mass of a dog moving at a speed of 7m/s and a momentum of 18kgm/s?
15. What is the mass of a falling object if the force is 79 N and it is falling at 10 m/s²?
16. What is the upward force called on an object falling through the air?
17. If a bowling ball and a feather are thrown off a building at the same height, which will hit the ground first? Explain
why using the correct vocabulary terms.
18. If a bowling ball and a feather dropped on the moon where there is no atmosphere, which will hit the ground first?
Explain why.
19. The amount of gravitational force between two objects depends on what two factors?
20. What has more momentum at 20 km/h, a bicycle or a bus? Why?
21. What has more momentum, a car at 20 km/h or the same car at 40 km/h? Why?
22. What happens to the momentum of both objects when a moving pool ball collides into a stationary pool ball?
23. What is inertia?
24. What is free fall?
25. What is centripetal force?
26. What is momentum? How does it differ from inertia?
27. What causes weightlessness on the orbiting space station?
28. What is the difference between weight and mass?
For questions 29-38 use the words below to complete the sentences:
Centripetal force
air resistance
Newton’s 2nd Law
Newton’s
Newton’s 3rd law
terminal velocity
weight
Kilograms or grams
Law of Conservation of Momentum
distance
action-reaction forces
29. The phrase “to every action there is an equal and opposite reaction” is ________________.
30. When a car travels around a curve in the road, ________________ helps to keep the car traveling in a curved path.
31. The largest velocity reached by a falling object is its _________________.
32. The force exerted by air on a moving object is called __________________.
33. The net force acting on an object causes the object to accelerate in the direction of the force; this is
_________________.
34. An object’s __________________ is the measure of the force of gravity on that object.
35. The amount of gravitational force between two objects depends on their masses and the ______________
between them.
36. Weight is measured in units called _______________, while mass is measured in units called _______________.
37. When two objects collide, their momentum after the collision is explained by ____________________.
38. When a force is exerted on an object, an equal and opposite force is exerted by the object. These forces are
referred to as ____________________.