Forces Test Review Packet

Complete all the review problems by WED. 5/27

Test Date: THUS. 5/28/15

Essential Questions

1. How are distance, time and speed related?
2. How does motion change?
3. How do forces affect motion?

Suggestions:

• Reread lessons 1 through 3 (pages 5- 41)
• Look at past quizzes, labs, worksheets, and notes

Know and be able to define the following words:

Position / Reference point / Speed
Vector / Motion / Velocity
Acceleration / Centripetal acceleration / Force
Net force / Inertia / Newton
Newton’s First Law / Newton’s Second Law / Newton’s Third Law

Review Part I

Lesson 1: Know how to calculate distance, time and speed. Use the formula speed = distance ÷ time

Max chases a ball around the back yard and travels at a speed of 16 m/s for 5 seconds. What distance does he travel?

Sylvester Snail crawls at a speed of 12 mm/minute for a distance of 110 millimeters. How much time does it take him to travel this distance?

Leah drives to California and covers a distance of 4,100 miles in 55 hours. What is her average speed?

Mike leaves his house at 6:30 AM and arrives at his sister’s house at 11:00 AM. What is his average speed in mi/hr if he traveled 300 miles?

Lesson 2: Know how to calculate acceleration both positive and negative.

1. A car is at rest and accelerated to 70 miles/hr. in 0.25 hours. What is its acceleration?
1. A sprinter is running at a speed of 12 m/s and slows to a stop in 8 seconds. What is the acceleration?
1. Mrs. Simon’s dog, Oscar, chases a ball at a speed of 15 m/s and slows down to 3 m/s to retrieve it. He slows down in 4 seconds. What is his acceleration?
1. Define centripetal acceleration and give a real life example of where you would see it.

Lesson 3: Know how to calculate net force and how to use Newton’s three laws of motion.

Net force = /

Net force =

Net force = 12 N left
A= /

Net force = 52 N right
B =

5. A woman pushes a stalled car. The woman pushes with a force of 88 N. What is the mass of the car if the car accelerates at 5 m/s2? SHOW ALL WORK.

6. . A 2130 kg car accelerated at a rate of 4.0 m/s2. How much force is the car’s engine producing? SHOW ALL WORK.

7. Bill pushes a 40 kg box with a force of 500 N. What is the acceleration of the box?

8. John is pulling a 7 kg box with a 95 newton force. What acceleration will it have?

Motion & Newton's Laws Review Part II

1. If two objects have different masses, which object is easier to accelerate? Which law supports your answer?
2. The tendency of an object to resist change in its motion is known as______.
3. Speed equals distance divided by______.
1. \\\
2. On a graph showing distance versus time, a horizontal line represents an object that is______.
1. Give an example of negative acceleration:
1. If a bicyclist travels 30 kilometers in two hours, her average speed is ______
1. In speed-versus-time graph, a straight line shows that acceleration is______
2. A person traveling in a car that stops suddenly keeps moving forward due to ______.
3. If the action force of a bat striking a ball accelerates the ball in one direction, the reaction force accelerates the
bat in the ______direction.
4. A roller coaster is moving at 10 m/s at the top of a hill and 22 m/s at the bottom of the hill two seconds later. What is the average acceleration?
______
5. To describe velocity you need to know ______and______.
6. The total distance traveled divided by the total time taken to travel the distance is ______.
7. If your speed changes from 10 km/h to 6 km/h, you have ______acceleration.
8. Newton's first law of motion states that an object remains at rest unless a(n) ______force acts on it.
9. The statement "for every action, there is an equal but opposite reaction" is a statement of
______law.
10. When a swimmer pushes the water back, the water pushes the swimmer forward. What is the reaction force to in this situation?
1. If you push a skateboard that has a mass of 60kg with a force of 6N, what force will the skateboard push back
on you according to Newton’s third law of motion? ______
2. Forces that are equal in size but opposite in direction & cause no change in motion are
______.
3. Draw a distance/time graph that shows the motion of a person who left home, sat on a park bench for a while and then walked home at a constant speed?

21. How far did Kathy jog in the first 4 minutes?

22. What is Kathy’s average speed? Show your work.

1. How would you describe Kathy’s motion?

24. Describe Rachel’s motion at 9 minutes.

25. If Rachel’s motion from 2 to 7 seconds had continued, what would have been her distance at 10 seconds?

26. What is the motion of an object with zero acceleration?______

27. What is the acceleration formula?

28. If a family took a vacation and was traveling 60m/h, how far would they have traveled after 3 hours? ______

29. Draw a velocity/time graph that represents positive acceleration

30. Which ball has the fastest acceleration?

31. What happened to the speed of ball B during the final two seconds?

32. What does the line segment on the graph from 0 to 3 seconds represent for ball B?