Fundamentals of Physics Study Set 2

Physics & Astronomy

Quiz 8 :

Potential Energy and Conservation of Energy

Quiz 8 :

Potential Energy and Conservation of Energy

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A body at rest in a system is capable of doing work if:
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D

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A golf ball is struck by a golf club and falls on a green eight feet above the tee.The potential energy of the Earth-ball system is greatest:
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E

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Suppose that the fundamental dimensions are taken to be: force (F), velocity (V)and time (T).The dimensions of potential energy are then:
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B

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The sum of the kinetic and potential energies of a system of objects is conserved:
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A ball is held at a height H above a floor.It is then released and falls to the floor.If air resistance can be ignored, which of the five graphs below correctly gives the mechanical energy E of the Earth-ball system as a function of the altitude y of the ball? img
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Two particles interact by conservative forces.In addition, an external force acts on each particle.They complete round trips, ending at the points where they started.Which of the following must have the same values at the beginning and end of this trip?
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A force on a particle is conservative if:
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A 6.0-kg block is released from rest 80 m above the ground.When it has fallen 60 m its kinetic energy is approximately:
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Which one of the following five quantities CANNOT be used as a unit of potential energy?
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Two objects interact with each other and with no other objects.Initially object A has a speed of 5 m/s and object B has a speed of 10 m/s.In the course of their motion they return to their initial positions.Then A has a speed of 4 m/s and B has a speed of 7 m/s.We can conclude:
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A nonconservative force:
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The wound spring of a clock possesses:
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Only if a force on a particle is conservative:
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An elevator is rising at constant speed.Consider the following statements: I.the upward cable force is constant II.the kinetic energy of the elevator is constant III.the gravitational potential energy of the Earth-elevator system is constant IV.the acceleration of the elevator is zero V.the mechanical energy of the Earth-elevator system is constant
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No kinetic energy is possessed by:
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A 0.20-kg particle moves along the x axis under the influence of a conservative force.The potential energy is given by U(x)= (8.0 J/m2)x2 + (2.0 J/m4)x4, Where x is in coordinate of the particle.If the particle has a speed of 5.0 m/s when it is at x = 1.0 m, its speed when it is at the origin is:
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A force of 10 N holds an ideal spring with a 20-N/m spring constant in compression.The potential energy stored in the spring is:
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A good example of kinetic energy is provided by:
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A 0.50-kg block attached to an ideal spring with a spring constant of 80 N/m oscillates on a horizontal frictionless surface.The total mechanical energy is 0.12 J.The greatest extension of the spring from its equilibrium length is:
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A 2-kg block is thrown upward from a point 20 m above the Earth's surface.At what height above Earth's surface will the gravitational potential energy of the Earth-block system have increased by 500 J?
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