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Physics 11 Assignment #2 Dynamics Physicist: Learning Outcomes (Student will be able to…): apply Newton's laws of motion to explain inertia and the relationships among force, mass, and acceleration analyze natural and technological systems to interpret and explain their structure and dynamics use vectors to represent forces □ (1) Does not meet □ (2) Meet outcome with outcome assistance □ (3) Meets outcome □ (4) Meets outcome with minimal or no assistance with in-depth understanding Level 1 – Knowledge/Comprehension (4 points) 1. Define net force. 2. Define static frictional force. 3. Multiple Choice: Shade in the most appropriate answer. An airplane is moving at constant velocity in a straight level flight. What is the net force acting on the plane? a. zero b. upward c. downward d. in the direction of motion A cable on an elevator exerts a 6 N upward force. The downward force of gravity on the elevator is 4 N. The elevator could be a. moving upward with constant speed. b. downward with a constant speed. c. moving upward with decreasing speed. d. moving upward with increasing speed. a b c d a b c d Level 2 – Application/Analysis (12 points) 4. A hockey stick exerts a force of 575 N[E] on a 0.125-kg hockey puck. What is the acceleration of the puck? Show a free-body diagram and relevant equations. (3) 5. You are moving a 95 kg wood crate across a wood floor (the coefficient of static friction is 0.40). What is the magnitude of the force with which you must push to start the crate moving? Show a freebody diagram and relevant equations. (3) 6. Two objects, m1 and m2, are accelerated independently by forces of equal magnitude. Object m1 accelerates at 10.0 m/s2 and m2 at 20.0m/s2. What is the ratio of (a) their inertial masses? (b) their gravitational masses? (3) 7. A car can accelerate from rest to 100 km/h (or 27.8 m/s) in 6.0 s. If its mass is 1500 kg, what is the magnitude of the applied force? Show a free-body diagram and relevant equations. (3) Level 3 – Synthesis/Evaluation (4 points) m1 m2 8. An Atwood machine consists of two masses (m1=3.8 kg) and (m2=4.2 kg). What is the acceleration of the masses? What is the tension in the rope? Note: you must derive the equation for tension using a free-body diagram to receive full credit. (2) 9. A cardboard box of negligible mass filled with 45 kg of paper sits on a ramp that makes an angle of 21o with the horizontal. The coefficient of static friction is 0.42. Will the box slide down the ramp? Explain with an appropriate problem-solving method. (2)