Quiz 1 of 0
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SPH3U: Lesson 8 Quiz
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Answer all of the questions below. Where appropriate, be sure to draw a free body diagram of the forces acting on the object. Your diagram should be drawn to scale. Unless otherwise stated, assume that the only forces acting on the object are the ones mentioned in the problem.
- A car engine provides a forward thrust of 4 000 N. There is 800 N off friction acting to slow the car down and 600 N of air resistance. What is the net force acting on the car?
- An airplane is flying at a constant speed. The thrust from the propeller is 8 000 N [E]. A crosswind is applying a force of 2 000 N [N]. What is the net force acting on the airplane?
- The cable that supports an elevator exerts a force of 14 000 N upwards on the elevator. Gravity pulls down on the elevator with a force of 12 000 N. What is the net force acting on the elevator?
- Considering your answer to question 3, how would you describe the forces causing the motion of the elevator, using the terms friction, gravity, and normal force?
Remember that you can scan your answer sheets, and send them in jpg, pdf, or rft format, however the file must be less than 5 MB. Make sure your name is printed on every sheet.
Rubric
Free Body Diagrams
| Categories | Level 1 (50 – 59%) | Level 2 (60 – 69%) | Level 3 (70 – 79%) | Level 4 (80 – 100%) |
|---|---|---|---|---|
| Knowledge and Understanding: distinguish between, and provide examples of, different forces (e.g., friction, gravity, normal force), and describe the effect of each type of force on the velocity of an object. FR3.01. | Distinguishes between different forces, using a moving elevator as an example, with limited ability. | Distinguishes between different forces, using a moving elevator as an example, with some ability. | Distinguishes between different forces, using a moving elevator as an example, with considerable ability. | Distinguishes between different forces, using a moving elevator as an example, with a high degree of ability. |
| Communication: use appropriate numeric, symbolic, and graphic modes of representation for qualitative and quantitative data. SI1.12. | Uses appropriate numeric, symbolic, and graphic modes of representation for qualitative and quantitative data with limited effectiveness. | Uses appropriate numeric, symbolic, and graphic modes of representation for qualitative and quantitative data with some effectiveness. | Uses appropriate numeric, symbolic, and graphic modes of representation for qualitative and quantitative data with considerable effectiveness. | Uses appropriate numeric, symbolic, and graphic modes of representation for qualitative and quantitative data with a high degree of effectiveness. |
| Application: solve problems involving forces in one dimension, using free body diagrams and algebraic equations. FR2.04. | Solves problems involving forces in one dimension, using free body diagrams and algebraic equations with limited success. | Solves problems involving forces in one dimension, using free body diagrams and algebraic equations with some success. | Solves problems involving forces in one dimension, using free body diagrams and algebraic equations with considerable success. | Solves problems involving forces in one dimension, using free body diagrams and algebraic equations with a high degree of success. |
Note: A student whose achievement is below Level 1 (50%) has not met the expectations for this assignment or activity.