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Forces and Newton’s Laws Physics 1 Review 1. What is a force? ____________________________________________________ 2. Define the following types of forces: a. Normal force ____________________________________________________ b. Weight _________________________________________________________ c. Friction ________________________________________________________ d. Tension ________________________________________________________ e. Applied force ____________________________________________________ f. Circular Force ___________________________________________________ g. Gravitational force ________________________________________________ h. Net force _______________________________________________________ i. Balanced forces __________________________________________________ j. Unbalanced forces ________________________________________________ 3. What is the metric unit for force? ______________________ What combination of units is it equal to? _________________ English (Customary) unit? ___________________________ 4. What is the difference between mass and weight? _________________________________________________________________________ 5. What is inertia? _____________________________________________________________ 6. State Newton’s Laws of Motion: a. First Law: ______________________________________________________________ _________________________________________________________________ b. Second Law: ____________________________________________________________ _________________________________________________________________ c. Third Law: _____________________________________________________________ _________________________________________________________________ Draw force diagrams for each problem and solve: 7. A 10-kg sled is pulled along level ground. The sled’s rope makes 30o angle with the horizontal and pulls on the sled with a force of 180 N. Find the acceleration of the sled, if the friction to be overcome is 15N? 8. The coefficient of friction between a rubber tire and a dry concrete road is 0.7. a) What is the maximum acceleration possible for a car on such a road? B) What is the minimum distance in which a car on such a road can be stopped when it is moving at 60 mph? 9. A person weighing 490 N stands on a scale in an elevator. What does the scale read when the elevator is at rest? 10. The elevator starts to ascend and accelerates the person up at a rate of 2m/s2. What does the scale read now? 11. When the elevator reaches a desirable speed it no longer accelerate. What is the reading on the scale as the elevator rises uniformly? 12. The elevator begins to slow down as it reaches the proper door. Do the scale readings increase or decrease? 13. The elevator starts to descend. Does the scale reading increase or decrease? 14. What does the scale read if the elevator descends at a constant rate? 33. The cable snaps and the elevator falls freely, what would the scale read? 34. Determine the acceleration that a force of 25 N gives to a 4-kg mass. The frictionless force to be overcome is 5 N.
