Name Period Unit 4 Test Review Packet

Transcription

1 Name Period Unit 4 Test Review Packet Below is a list of the objectives you need to be able to do in this unit. Rank yourself on each of the objectives to identify where you need to focus your studying: Targets 4.01B. State and apply Newton s 1 st laws: Mastery: I can do this consistently. Developing: still working on some of the details Beginner: I need help to do this. 1. State Newton s 1 st law (also called law of inertia) and describe how it applies to physical situations. 2. Make predictions about the motion of objects that have unbalanced forces exerted on them 3. Make predictions about the motion of objects that have balanced forces. 4.02A. Identifying and labeling forces: Identify and label the forces acting on an object (by drawing system schema and a force diagram). 4.03B. State and apply Newton s 3 rd law: 1. Identify examples of third law pairs 2. Identify when forces are and are NOT equal according to Newton s 3 rd law 4.04A, 4.05B, 4.06C. Solve problems with balanced forces: 4.04A Solve force diagram problems for basic perpendicular balanced forces. 4.05B Solve force diagram problems for angled balanced force. 4.06C Be able to rotate the axes to solve force diagram problems for objects on a ramp. 1

2 In addition to doing the review packet, complete at least one item from List A AND one item from List B below. Check the one that you chose, and answer the brief question following it. A. Complete at least one of the following. Find your two lowest quizzes and re do the whole things without looking at the answer. Which quizzes? Re do (at least) 4 problems from different worksheets or online assignments. Focus on the ones you found most difficult. Which assignments? B. Complete at least one of the following. Redo the review exercises (posted on the website!) for targets 4.01, 4.02, or Don t just read them actually answer the questions on paper! What is one thing you had forgotten or missed the first time around? Go to extra help with questions you still need answered. What is your question? Read through an article from The Physics Classroom online Vectors: Newton s Laws: What is one thing you didn t know or didn t remember that this article helped clarify? Name Period Date Unit 4 Test Review Packet 2

3 This review packet mirrors your assignment in WebAssign. Be sure to fill in your answers in WebAssign in order to get credit! You must ALSO write your answers in this packet. 1a. Which has more inertia? Rank the objects below. A. Basketball (not moving) B. Basketball rolling across floor C. Bowling Ball D. Bowling Ball rolling across floor Mass = 0.6 kg Velocity = 0 m/s Mass = 0.6 kg Velocity = 2 m/s Mass = 7 kg Velocity = 0 m/s Mass = 7 kg Velocity = 2 m/s RANK the items above (A,B,C, and D) from Least Inertia to Most Inertia. If two are equal, write = between them (e.g. A, B=C, D) Least Inertia Most Inertia 1b. Explain WHY you chose the ranking above. 2. You are riding in a car drinking a hot chocolate when your mom hits the brakes. Which way does your hot chocolate slosh initially (forward or backward) and why? Explain using Newton s 1 st law. 3

4 3. Two students are watching a football player pushing a sled (weights) during a workout. Since they are in the same physics class, they begin discussing the forces. They notice that the sled is moving at a constant velocity. Jared says, I think that the football player pushes with an applied force equal to the frictional force. Since the forces are balanced, it moves with a constant velocity. Tommy says, The football player exerts a force on the sled, so it exerts an equal and opposite force back on him. The forces balance out, so the sled moves at a constant velocity. a. What is the difference between these two statements? b. Jared is correct. What can he say to help Tommy better understand why the sled moves at a constant velocity? (A force diagram may help your explanation) 4

5 4a. For each of the forces listed below, identify the reaction force. Force Reaction force A rocket exerts a downward force on the air A gravitational force from the earth pulls the man downward A dog sits on a table. The dog exerts a downward force on the table. The earth exerts a downward gravitational force on the dog. 4b. Taylor and Alex are discussing the previous question about the man falling. Taylor says, The man moves downward, so there is an equal and opposite reaction of the earth moving upward the same amount. Do you agree or disagree? Ezplain: Alex says, The earth pulls the man downward, so the equal and opposite reaction is the man hitting the ground. Do you agree or disagree? Ezplain: 5

6 Forces Balanced? System Schema Force Diagram 5. A hockey puck slides across an ice rink without friction. It moves with a constant velocity Draw the forces on the puck. 6. A sign is held by a metal rod and a steel cable. Draw the forces on the sign. 6

7 Forces Balanced? System Schema Force Diagram 7. A man pulls his daughter in a wagon. Draw the forces on the wagon. 8. A box is motionless on a ramp. Draw the forces on the box. 7

8 9. A man is pushing a box with a N force to the right. He is angry because the box will not move. The box has a mass of kg. a. Identify all forces acting on the box and draw a system schema in the space below: b. Draw a force diagram for the box. c. Create a Force Table and fill in all information that you know. Force x y d. Use the graph paper above to create a quantitative force diagram. TOTAL 8

9 10. A water pail is pulled upwards at a constant velocity. The pail has a mass of kg and the water has a mass of kg. a. Identify all forces acting on the water/pail system and draw a system schema: b. Draw a qualitative force diagram in the space below: c. Create a Force Table and fill in all information that you know. Force x y d. Use the graph paper above to create a quantitative force diagram. TOTAL Bonus: How would your force diagram be different if your system was just the bucket? 9

10 11. A ninja pulls his pet dog in a red wagon. The ninja pulls with wagon with a force of N at an angle of 32 o from the horizontal. The combined mass of the dog and wagon is kg. The wagon moves at a constant velocity. a. Identify all forces acting on the dog/wagon system and draw a qualitative force diagram in the space below: b. Draw a system schema for the dog/wagon system. c. Create a Force Table and fill in all information that you know. Force x y d. Use the graph paper above to create a quantitative force diagram. TOTAL 10

11 12. A man at the beach pushes a huge beach ball up a sand dune at a constant velocity. He exerts a N force on the kg beach ball. The sand dune has a 50 o incline. a. Identify all forces acting on the beach ball and draw a qualitative force diagram in the space below: b. Draw a system schema for the beach ball. c. Create a Force Table and fill in all information that you know. Force x y d. Use the graph paper above to create a quantitative force diagram. TOTAL 11