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- To what extent was Aristotle’s model of falling bodies correct? How was it wrong?What forces act on you as you walk across a room? Draw a free-body diagram showing all of them. Which force or forces propel you forward? Why is it more difficult to walk on a slippery surface than on a nonslippery one? Explain how you use Newtons third law to control your motion.The wheels of a midsize car exert a force of 2100 N backward on the road to accelerate the car in the forward direction. If the force of friction including air resistance is 250 N and the acceleration of the car is 1.80 m/s2, what is the mass of the car plus its occupants? Explicitly show how you follow the steps in the Problem-Solving Strategy for Newton's laws of motion. For this situation, draw a free-body diagram and write the net force equation.
- 1. Solve the following using Newton's Laws of Motion (First and Second Laws): a) What is the acceleration of an object of mass 21.0 kg if a net force of 68.4 N is applied to it in the forward direction?1.Solve the following using Newton's Laws of Motion (First and Second Laws): An elevator with eight people in it has a total mass of 2635 kg. As the elevator starts upward, it accelerates at 0.41 m/s2. What tension is in the cable lifting the elevator?2) Force is given by mass times acceleration. If the force on a body is 20N and its mass is 12kg, how much is the acceleration? 3) As you step out of the boat, you move forward and the boat moves backwards. Which law of motion is that? Name the law Explain the law Give a different example of the same law
- A 44 kg box is moving at a constant acceleration of 1.8 m/s2. What is the force acting on the box?Newton's Laws of Motion2. How much tension must a rope withstand if it is used to accelerate a 1210-kg car horizontally along a frictionless surface at 1.20m/s^2?A single-celled animal called a paramecium propels itself quite rapidly through water using its hair-like cilia. A certain paramecium experiences a drag force of ?drag=−??2 in water, where the drag coefficient ? is approximately 0.330 kg/m . If the paramecium's speed ? is 0.000137 m/s , what is the magnitude of the propulsion force that the creature must generate to move at this constant speed?
- 1. Look at the data: as the net force increased, what happened to the acceleration? Did it increase, decrease or stay constant? Why? 2. Did a change in the net force produce a change in acceleration by the same factor? Do the results agree with Newton’s 2nd Law?? ExplainExplain what the concept of force means in physics, why forces are vectors, and the significance of the net force on an object?1- Suppose that a 30 N force and a 20 N force act on an object. What is the resultant force when these two forces act in opposite directions? 2- A man with a mass of 100 kg slides down a vertical pole at a constant speed. Using the following equation, evaluate the force of friction provided by the pole: ΣF = 0 3- A vehicle changes its velocity from 90 km/h to a dead stop in 10 seconds. What is the vehicle’s acceleration, using this formula: Acceleration = (Change in Velocity) / (Time Interval)? (Hint: the vehicle decelerates at 2.5 km/h X s) 4- Consider a pair of forces, one with a magnitude of 25 N and the other with a magnitude of 15 N. What maximum net force is possible for these two forces? 5- Consider a pair of forces, one with a magnitude of 25 N and the other with a magnitude of 15 N. What is the minimum net force possible? 6- A 400 kg lion grasping a vertical tree slides down at a constant velocity. What is the friction force of the tree? (Hint: Constant velocity means…