1) Block B in Fig. 6-31 weighs 603 N. The coefficient of static friction between block and table is 0.32; angle θ is 33°; assume that the cord between B and the knot is horizontal. Find the maximum weight of block A for which the system will be stationary. Fig. 6-31 A)150 N B)175 N C)125 N D)200 N 2) In Fig. 6-33‚ two blocks are connected over a pulley. The mass of block A is 7.8 kg and the coefficient of kinetic friction between A and the incline is 0.13. Angle θ of the incline is 44°
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Lecture 4 Application of Newton’s Law Outlines 1. Newton’s third law 2. Free body diagram 3. Equilibrium In Translational Motion 4. Non - Equilibrium In Translational Motion 1.0 Newton’s 3rd Law For every action there is an equal and opposite re-action. 1.0 Newton’s 3rd Law Cont. If object 1 and object 2 interact‚ the force exerted by object 1 on object 2 is equal in magnitude but opposite in direction to the force exerted by object 2 on object 1. Equivalent to saying a single isolated
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find all choices before answering. face of the table? Assume the boxes each have masses of 2.0 kg‚ the coefficient of static friction is µs between table and box‚ and the acceleration due to gravity is 10 m/s2 . 001 10.0 points A block accelerates 3 m/s2 down a plane inclined at angle 27.0◦. The acceleration of gravity is 9.81 m/s2 . 1. The force of the static friction would have a vertical component in this situation‚ and that is impossible since it must be parallel to the table surface
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as heat. From basic physics‚ the kinetic energy of a body in motion is defined as: Kinetic Energy = • • 1 2 × mv × vv 2 where mv = the mass (commonly thought of as weight) of the vehicle in motion where vv = the velocity (commonly known as speed) of the vehicle in motion Ideally‚ this energy is completely absorbed by the braking system. While this is not entirely the case‚ for a stopping event at maximum deceleration most of the vehicle’s kinetic energy is converted into thermal
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Momentum And Friction Physical quantities that have a magnitude and a direction in space are described by vectors. Velocity is speed and direction. Acceleration is increase in speed. Linear momentum (p) of a single particle (point-like object) in vector notation: p = m * v. Specific types of friction: Drag (wind resistance) Static (maximum occurs right before the object moves) Kinetic (usually less than static) F friction = u*N (u is just the coefficient of friction) Terminal
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Physics I Honors: Chapter 4 Practice Exam Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Which of the following statements does not describe force? a. Force causes objects at rest to remain stationary. b. Force causes objects to start moving. c. Force causes objects to stop moving. d. Force causes objects to change direction. ____ 2. Which of the following forces arises from direct physical contact between two objects? a. gravitational
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centrifugal pump uses a spinning "impeller" which normally has backward-swept blades A centrifugal pump works by converting kinetic energy into potential energy measurable as static fluid pressure at the outlet of the pump. This action is described by Bernoulli’s principle. With the mechanical action of an electric motor or similar‚ the rotation of the pump impeller imparts kinetic energy to the fluid through centrifugal force. The fluid is drawn from the inlet piping into the impeller intake eye and
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C1. A room in a house has a floor area of 120 ft2. Which of the following is most likely the approximate volume of the room? b. 30 m3 C2. When SI units are plugged into an equation‚ it is found that the units balance. Which of the following can we expect to be true for this equation? a. The equation will be dimensionally correct. C3. How long has it been that scientists have accepted that the nucleus of the atom consists of neutrons and protons? Think of your answers in terms of order
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Physics Formulas: Mechanics Mechanics is the oldest branch of physics. Mechanics deals with all kinds and complexities of motion. It includes various techniques‚ which can simplify the solution of a mechanical problem. Here are some of the often required physics formulas falling in mechanics domain. Motion in One Dimension The physics formulas for motion in one dimension (Also called Kinematical equations of motion) are as follows. (Here ’u’ is initial velocity‚ ’v’ is final velocity‚ ’a’ is
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Force: a force that results when one object makes contact with another (pushes or pulls it) * Tension: a pulling force‚ with a rope/ string * Normal force: only when in contact with something ie. The ground. Points away from surface * Friction: opposes the sliding of two surfaces cross one another. Act opposite to the motion/ attempt at motion (electrostatic forces) * Force diagram-show all forces acting on object Newtons first Law: * Inertia: proportional to mass of the object
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