Name______________________________ Newton Laws Review Sheet Put answers on a separate sheet of paper. 1. a) Draw a complete free-body diagram for an object accelerating down an incline plane. Find all the forces and the acceleration listed below. The angle of the incline is 20o, mass of the object is 2.5 kg, and µ = 0.30. FN = ___________ Fg = ___________ Fgx = ___________ Fgy = ___________ Ffric= ___________ Fnet = ___________ a = ___________ b) What happens to each of the forces and the acceleration of the mass, if the angle of the incline is increased? 2. Mrs. Cadorini is frustrated with her class, so she kicks a 2.0 kg calculator across the floor. Find the acceleration of the calculator if the coefficient of friction between the calculator and the floor is 0.20 and the force exerted on it is 16N to the right. Draw a free-body diagram. 3. The famous ice skating duo, Mike and Aliza are preparing for practice when Mike gives Aliza a push of 130 Newtons. If Aliza has a mass of 55 kg and Mike has a mass of 85 kg, find their accelerations. Include a free-body diagram. 4. If you use a horizontal force of 30.0N to slide a 12.0 kg wooden crate across a floor at a constant velocity, what is the coefficient of friction between the crate and the floor? Draw a free-body diagram. 5. Alec is standing on a spring scale in an elevator to see if Mrs. Cadorini was correct about weighing yourself in an elevator. If Alec has a mass of 75 kg, calculate what the scale will read if: a) the elevator is at rest b) the elevator accelerates upward at 1.5 m/s2 c) the elevator accelerates downward at 1.5 m/s2. Show a free-body diagram for each situation. 6. Jason is deciding to help his mom by taking out the trash. He pulls a garbage can with a mass of 50 kg along a flat, concrete driveway. The coefficient of friction between the trash can and the driveway is 0.30. a) What does the trash can weigh? b) What force is needed to keep the trash can moving at a constant velocity? c) What force must be applied to the trash can to accelerate it at 3.0 m/s2? 7. Paul is in his car and is waiting at a red light. All of a sudden, a senior citizen with poor eye sight hits the back of Paul’s car. What way will Paul move with respect to his car? What way will the senior citizen move with respect to his car? Explain using Newton’s first law. 8. What characteristics describe an object that is in equilibrium? (List as many as you can) 9. What are the relationships between force, mass, and acceleration?
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