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Learning Objectives 1. What is a force? What is the net force on an object? 2. What is a free body diagram? Given an object that is acted upon by one or more forces, be able to draw the free body diagram for the situation. 3. Given an object that is acted upon by one or more forces (such as weight, friction or drag), be able to determine the net force in the horizontal direction and the net force in the vertical direction. 4. What is inertia? 5. What are Newton’s three laws? 6. Given an example of a situation involving one of Newton’s three laws, be able to determine which of the three laws is most applicable to the situation. 7. Be able to use Newton’s 2nd law to determine the acceleration of an object that is acted upon by one or more forces (such as weight, friction or drag). 8. Be able to use Newton’s 2nd law to determine a force on an object given an acceleration (or the data to compute it) and the value of other forces. 9. Given a system of pulleys, a string and a weight, be able to determine the tension in the string. 10. What is weight? What is the difference between weight and mass? How do you compute the weight of an object given its mass? Be able to solve problems involving weight. 11. What is the normal force? What are the forces of tension, thrust, drag and friction? 12. Be able to determine if a data set or graph of a data set represents a direct proportion or an inverse proportion. 13. Be able to algebraically solve an equation for any variable in the equation. Dynamics Practice Test 1. What are the units of force? a. m/s2 b. newtons c. kg d. m/s 2. What is a force? a. a push or a pull b. an acceleration c. a mass d. a change in velocity For the next six questions, decide which of Newton’s three laws applies. 3. Fnet = ma a. Newton’s 1st Law b. Newtons 2nd Law c. Newton’s 3rd Law 4. For every action, there is an equal and opposite reaction. a. Newton’s 1st Law b. Newtons 2nd Law c. Newton’s 3rd Law 5. Unless acted upon by a net force, an object at rest tends to stay at rest while an object in motion tends to stay in motion. a. Newton’s 1st Law b. Newtons 2nd Law c. Newton’s 3rd Law 6. The force of a bat on a baseball causes the bat itself to break. a. Newton’s 1st Law b. Newtons 2nd Law c. Newton’s 3rd Law 7. A truck towing a trailer does not accelerate as well as the same truck when it is not towing a trailer. a. Newton’s 1st Law b. Newtons 2nd Law c. Newton’s 3rd Law 8. Once it is hit, a hockey puck moves with constant speed in a straight line over the ice. a. Newton’s 1st Law b. Newtons 2nd Law c. Newton’s 3rd Law The next four questions are about a 20 kg crate that is pushed with a horizontal force of 100 N across the floor. The force of friction is 70 N. 9. What is the net force on the crate? a. 196 N b. 100 N c. 80 N d. 30 N e. 20 kg 10. What is the mass of the crate? a. 196 N b. 100 N c. 80 N d. 30 N e. 20 kg 11. What is the weight of the crate? a. 196 N b. 100 N c. 80 N d. 30 N e. 20 kg 12. What is the force on the crate from the floor? a. 196 N b. 100 N c. 80 N d. 30 N e. 20 kg 13. A 1000 kg spacecraft is propelled through space by a rocket engine that produces 500 N of thrust. What is the acceleration of the rocket? 2 2 2 2 2 a. 500000 m/s b. 500 m/s c. 2 m/s d. 1 m/s e. 0.5 m/s The next two questions are about a model rocket car that has a mass of 0.10 kg and is propelled with a thrust of 10 N. The friction and drag forces together acting on the car are 4 N. 14. What is the net force on the car? a. 0.98 N b. 10 N c. 6 N d. 0.10 kg e. 4 N 15. What is the acceleration of the car? 2 2 2 2 2 a. 60 m/s b. 6 m/s c. 0.6 m/s d. 9.8 m/s e. 100 m/s The next two questions are about the data about the force of friction on an object resting on a level surface as a function of the weight of an object. Sliding Friction (N) Weight (N) 3.9 8 10 19 5.1 10 .9 1.9 16. What type of proportion relates the variables in this data set? a. Inverse proportion b. Direct proportion 17. About what would be the friction force on the object if its weight were 4 N a. .5 N b. 1N c. 2N d. 4 N e. 8 N 18. What force is required to pull the 10 N weight up with the pulley system shown at the right? a. 20 N b. 10 N c. 5 N d. 3.3 N e. 2.5 N Star Questions (These Questions will be on the test) 10 N In the space below, solve the equation v2 = v02 + 2a(x – x0) for the variable x In the space below work out the following problem: A model rocket with a weight of 2.0 N is fired from the ground. The thrust of the rocket is 9.0 N and the average force of air drag has a magnitude of 3.0 N. A. What is the mass of the rocket? B. What is the net force on the rocket? C. What is the acceleration of the rocket? D. How high will the rocket be when it runs out of fuel 5.0 s after launch?

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posted: | 9/23/2011 |

language: | English |

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