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- 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…These two questions aren't correct. I still don't understand the logic, could you please revise it? A person sits in a chair. There is a weight force W acting on them. According to Newton's thirdlaw which force is equal in magnitude and opposite in direction to W?a) the normal force of the chair pushing on the personb) the normal force of the person pushing on the chairc the gravitational force of the person pulling on the Earthd) the static friction force of the ground on the chair An object with mass m slides down a sloped, frictionless ramp. The normal force of the ramp onthe object isa) less than mgb) equal to mgc) greater than mgd) not enough information2) 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
- 1. Which statement about Issac Newton is not true? A. Made huge advances in math, science, and other area B. His discoveries came naturally in "flashes of brilliance" due to his genius C. He came from very humble beginnings D. He thought long and hard to solve problems 2. An object falling at a steady rate as the force of gravity is equal to air resistance, is not in a state of a. Dynamic equilibrium b. Mechanical equilibrium c. non-free fall d. Free-fall 3. An object falling under only the influence of gravity is in a. Free fall b. Non-free fall c. Mechanical equilibrium d. Dynamic equilibrium1. Solve the following using Newton's Laws of Motion (First and Second Laws): a) Calculate the force needed to give a large crate of mass 1585 kg an acceleration of 4.7 m/s2 b) 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? c) What is the mass of a block of a material if a net force of 325 N acts on it and causes an acceleration of 2.74 m/s2 in the direction of the net force?1. A man pulls a crate with a rope. The crate slides along the floor in the horizontal direction (x direction). The man exerts a force of 50 N on the rope, and the rope is at an angle . Describe how the force components change as the angle increases from 0° to 90° and use your graph to explain your answer. Give a detailed explanation of the forces at 0 = 0°,45°, and 90°. Show a sample calculation at one angle for both components.
- Two snowcats in Antarctica are towing a housing unit to a new location, as shown in the figure (Figure 1). The sum of the forces F⃗A and F⃗B exerted on the unit by the horizontal cables is parallel to the line LL, and FA=4700 N . Part A Determine FB. Express your answer using two significant figures. Part B Determine the magnitude of F⃗A+F⃗B. Express your answer using two significant figures.1. Why are vehicles equipped with seat belts, air bags and helmets for motorcycles? Explain your answer in at least five sentences.1.) What is the algebraic expression for the normal force on mass m1? 2.) Find an algebraic expression for the horizontal net force on mass m1. Use your answer from Part A for the normal force in the formula for the friction force.
- Two dimensional dynamics often involves solving for two unknown quantities in two separate equations describing the total force. The block in (Figure 1) has a mass m=10kg and is being pulled by a force F on a table with coefficient of static friction μs=0.3. Four forces act on it: The applied force FF (directed θ=30∘above the horizontal). The force of gravity Fg=mgFg=mg (directly down, where g=9.8m/s2). The normal force N (directly up). The force of static friction fs (directly left, opposing any potential motion). If we want to find the size of the force necessary to just barely overcome static friction (in which case fs=μsN, we use the condition that the sum of the forces in both directions must be 0. Using some basic trigonometry, we can write this condition out for the forces in both the horizontal and vertical directions, respectively, as: Fcosθ−μsN=0 Fsinθ+N−mg=0 In order to find the magnitude of force F, we have to solve a system of two equations with both F and the…Two boxes, A and B, are connected to each end of a light vertical rope, as shown in the following figure. A constant upward force 84.0 N is applied to box A. Starting from rest, box B descends 13.0 m in 4.70 s . The tension in the rope connecting the two boxes is 30.0 N (Figure 1). I) What is the mass of box B? (Express your answer with the appropriate units.) II) What is the mass of box A? (Express your answer with the appropriate units.)1. Apply Newton's second law to find the formula for the acceleration of the system. Ignore friction and the masses of the pulley and cord. Express your answer in terms of the variables mAmB, and appropriate constants. 2. Apply Newton's second law to find the formula for the tension in the cord. Ignore friction and the masses of the pulley and cord.