an inclined plane it gains speed because of gravity. When rolling up, it loses speed because of gravity. Why doesn't gravity play a role when it rolls on a horizontal surface? While rolling level a ball does not roll with or against the vertical force of gravity, it neither speeds up nor slows down. The rolling ball maintains a constant speed; this happens because friction overcomes the ball’s inertia and brings it to a stop. The horizontal component of gravity is zero. 2. What is the acceleration
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of moving objects. The subject is divided into kinematics and kinetics. Kinematics is the study of a body’s motion independent of the forces on the body. It is the study of the geometry of motion without consideration of the causes of motion. Kinematics deals only with relationships among the position, velocity, acceleration, and time. Kinetics deals with both forces and motion. 2. PARTICLES AND RIGID BODIES Bodies in motion can be considered particles if rotation is absent or insignificant
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the ground, what work was done by the 120 N force? [1.45×103 J] 2. A box of mass 5.0 kg is accelerated by a force across a floor at a rate of 2.0 m/s2 for 7.0 s. Find the net work done on the box. [490 J] 3. What is the minimum work needed to push a 950-kg car 810 m up along a 9.0º incline? (a) Ignore friction. (b) Assume the effective coefficient of friction retarding the car is 0.25. [(a) 1.2×106 J, (b) 3.0×106 J] 4. The net force exerted on a particle acts in the +x direction
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Lab Assignment 4: Types of Force Instructor’s Overview In many physics problems involving Newton’s laws of motion, you’ll see statements like, “assume a frictionless surface” or “neglecting air resistance…” In this lab we will be exploring both friction and air resistance, two resistive forces that are critical in the design of real-world products and systems. Understanding the effects of these types of forces is essential in the design of such things as aircraft, automobiles, braking systems
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providing your solution. Where appropriate, diagrams should be included. 1. A force of 250 N is used to push a heavy box down the street. If the force of friction between the box and the street is 195 N and the box has a mass of 60 kg, what is the acceleration of the box? 250-195=55N right Fnet=ma 55N=60a 55 / 60=a 0.92 m/s^2 2. A force of 40 N is applied to a 6 kg box of books. If the frictional force acting on the box is 16 N, and the box was initially at rest, what is the velocity
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opened by applying a force of 300 N perpendicular to the plane of the door, 0.80 m from the hinges. Find the torque due to this force about an axis through the hinges. 2. A 3.0-m rod is pivoted about its left end. A force of 6.0 N is applied perpendicular to the rod at a distance of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 N is applied at the end of the rod 3.0 m from the pivot. The 5.2 N is at an angle of 30o to the rod and causes a cw torque. What is the net torque about the
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which a projectile must be launched is 90°. _________________________ ____ 7. Forces of tension always act vertically upward. ______________________________ ____ 8. When forces acting on an object are in equilibrium, the object can still be moving. _________________________ ____ 9. The same forces act on two objects having different masses. The more massive object will experience the greater acceleration provided the forces are not “balanced.” ______________________________ ____ 10. For two given
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equilibrium of a particle. Theory: If the net force on a body is zero then it will not accelerate. If it’s at rest it has static equilibrium. If an unbalanced force acts on a body it will be accelerated. When unbalanced the particle can achieve its equilibrium by having a force that is applied that has an equal magnitude and is in the opposite direction. Procedure: 1. Attach 100 g (1.0 N) at 0 degrees and 100 g (1.0 N) at 270 degrees on the force table. Zero force probe and pull the third string until
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change its state by the action of an external force. This is normally taken as the definition of inertia. The key point here is that if there is no net force resulting from unbalanced forces acting on an object (if all the external forces cancel each other out), then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. And if an additional external force is applied, the velocity will change because of the force. The amount of the change in velocity is
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National Aeronautics and Space Administration Educational Product Educators Grades 5–12 & Students EB-2001-12-019-JPL Educational Brief C A S S I N I S C I E N C E I N V E S T I G A T I O N The Spinning World of Spacecraft Reaction Wheels Objective To demonstrate how reaction wheels (also known as momentum wheels) take advantage of Newton’s Third Law to control a spacecraft’s orientation. Time Required: 1 hour Saturn System Analogy: Cassini’s Reaction Wheel Assembly and its use during
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