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Transcript

Practice with Newtonβs First and Second Laws Name: 1. Which of the following objects has the greatest inertia? o o o o πΉπ = ππ π= πΉπππ‘ π πΉπππ‘ = ππ 2-kg mass moving at a constant velocity of 100 m/s, E 4-kg mass moving at a constant velocity of 2 m/s, E 2-kg mass moving at a constant velocity of 20 m/s, E 6-kg mass at rest 2. Explain why you made your choice. 3. Which object(s) could be moving with constant velocity along a straight line path if the only forces acting on it are those shown in each diagram? 4. Explain why you made your choice(s). 5. A certain force F gives a mass m an acceleration of a. The same force F would therefore give a mass of 2m an acceleration of ____. ο 2a ο a ο a/2 ο a/4 6. Explain why you made your choice. 7. A certain force F gives a mass m an acceleration of a. A force of 6F would therefore give a mass of 2m an acceleration of ____ . ο 12a ο 3a οa 8. Explain why you made your choice. ο a/3 9. Which of the following objects is more massive? ο A force F of 100 N pulls to the right causing this mass to accelerate at 25 m/sec2 to the right ο A force F of 50 N pulling to the right causes this object to accelerate to the right at 10 m/sec2 10. Explain why you made your choice. 11. What is the magnitude (size) of the missing force in the figure diagrammed below? F?= _________ 12. Explain why you made your choice. 13. What is the magnitude (size) of the missing force in the figure diagrammed below? F?= _________ 14. Explain why you made your choice. Recall that βnormalβ force is a mathematics term that means PERPENDICULAR to a supporting surface. This can result in some interesting diagrams! 15. Label the forces on the box to the right with these labels: weight (Fw), normal force (Fn), friction (Ff). 16. A 5-kg box sits on a horizontal floor. The box is pushed with a force of 20 N to the right, and there is an opposing friction force of 7 N. Draw a diagram of the box and the floor, and label ALL forces acting on the box with names AND magnitudes (numbers). 17. A box sits on an inclined plane as in #15. The box is pulled down the incline with a pulling force, and a friction force opposes the pull. Draw a diagram of the box and the inclined plane, and label ALL forces acting on the box. Labels only, similar to item 15, are all that is necessary (no numbers required). 15