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PHYS 101 Chapter Notes - Chapter 6: Gravitational Energy, Kinetic Energy, Net Force

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erinhorse495
16 Aug 2017
School
McGill University
Department
Physics
Course
PHYS 101
Professor
Kenneth Ragan

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PHYS 101 Full Course Notes
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PHYS 101 Full Course Notes
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Document Summary

Work is done on an object by a force when the object moves through a distance . If the direction of a constant force (cid:1832) makes an angle with the direction of motion, the work. Energy can be defined as the ability to the work. In si units, work and energy are measured in joules (1 j = 1 n: m). An object of mass and speed has translational (cid:1831)=(cid:2869)(cid:2870)(cid:2870) kinetic energy: The work-energy principle states that the net work done on an object (by the net force) equals the change in kinetic energy of that object: (cid:3047)= (cid:1831)=(cid:2869)(cid:2870)(cid:2870)(cid:2870) (cid:2869)(cid:2870)(cid:2869)(cid:2870) Potential energy (pe) is energy associated with forces that depend on the position or configuration of objects. Where (cid:1877) is the height of the object of mass above an arbitrary reference point. (cid:1831)(cid:3046)(cid:3047)=(cid:2869)(cid:2870)(cid:1876)(cid:2870) For a stretched for compressed spring, where (cid:1876) is the displacement from the unstretched position and is the spring stiffness constant.

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Physics: Principles with Applications
7th Edition, 2013
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ISBN: 9780321625922

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Related Questions

1. Can work be done on a system if there is no motion?

A) Yes, if an outside force is provided B) Yes, since motion is only relative C) No, since a system which is not moving has no energy D) No, because of the way work is defined 

2. The quantity 1/2 mv 2 is

 A) the power supplied to the object by the force  B) the work done on the object by the force  C) the kinetic energy of the object. D) the potential energy of the object.

3. If you push twice as hard against a stationary brick wall, the amount of work you do 

A) doubles. B) is cut in half  C) remains constant but non-zero  D) remains constant at zero 

4. If the net work done on an object is positive, then the object's kinetic energy 

A) increases. B) decreases  C) remains the same D) is zero

5 A force of 20 N moves an object in the direction of the force. The work done when the object moves from 2.0 to 4.0 m is o A) 20 J OB) 40 J oC) 60 J D) 80 J

1) The block below is pulled at a distance of 2.5 m. How much work is done by the force? 

2) What would be the work done if the force acts in a direction 30o above the horizontal?

3) Two objects of different mass start from rest, are pulled by the same magnitude net force and are moved through the same distance. The work done on object A is 500 J. After the force has pulled each object, Object A moves twice as fast as object B.Answer the following questions

  • I) How much work is done on object B
  • II) What is the kinetic energy of object A after being pulled?II) What is the kinetic energy of object A after being pulled?
  • IV) what is the ratio of the mass of object A to the mass of object B?

Which of the following statement are true mechanical energy? Include all that apply.

1.The total amount of mechanical energy of an object is the sum of its potential energy and the kinetic energy.

2. Heat is a form of mechanical energy.

3. The mechanical energy of an object is always conserved.

4. When non-conservative forces do work, energy is transformed from kinetic to potential (or vice versa), but the total mechanical energy is conserved.

5. A bowling ball is mounted from a ceiling by way of a strong cable. It is a drawback and released, allowed to swing as a pendulum. As it swings from its highest position to its lowest position, the total mechanical energy is mostly conserved.

6. When a friction force does work on an object, the total mechanical energy of that object is changed.

7. The total mechanical energy of an object remains constant if the only forces doing work on the object are conservative forces.

8. If an object gains mechanical energy, then one can be certain that a non-conservative force is doing work.