Free Response 18. Fill in the chart below and use complete sentences. Newton's Third Law Newton's First Law Newton's Second Law State the law Inertia force and motion Equal and opposite 세 F=ma Write any formulas used in this law -1 pushing Chair -1 State an example of how this law was demonstrated in class either by a lab or by a demo 19. Lee Mealone is sledding with his friends when he becomes disgruntled by one of his friend's comments. He exerts a rightward force of 9.13 N on his 4.68 kg sled to accelerate it across the snow. If the acceleration of the sled is 0.815 m/s/s, then what is the coefficient of friction between the sled and the snow? a. Draw a free body diagram of the sled as Lee is exerting the force. Drobado no ta b. Label ALL the forces in the free body diagram. 3 Rurhot ods no abst-22 Si muodos lovos od movie od umovalo c. List the equation for p (coefficient of friction) 45 b d. Find u. 19 20. Ethan is dragging a bag of grass from the garage to the street on the evening before garbage pick-up day. The values of the individual forces are: Fgrav = Fnorm = 60.5 N Fapp = 40.2 N Ffrict = 5.7 N. a. Draw a free body diagram of this situation and label all arrows correctly. b. Find the mass of the bag. c. Calculate the coefficient of friction. d. Determine the net force on the bag of garbage. 21. Moments after making the dreaded decision to jump out the door of the airplane, Darin's 82.5-kg body experiences 118 N of air resistance. a. Draw a free body diagram of this instant and label all forces. b. Determine Darin's acceleration at this instant in time. BONUS: You push a 13 kg table in the cafeteria with a horizontal force of 20 N but it does not move. You then push it with a horizontal force of 25 N and it begins moving. It then accelerates at 0.26 m/s?. a. What is the static coefficient of friction? b. What is the sliding (kinetic) coefficient of friction? Bonus: List two situations when a = 0.
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