CHIR114 Lecture Notes - Lecture 1: Kinetic Energy, Potential Energy

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marooncaribou266

22 Aug 2018

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9th august 2018 - energy: what is energy: It is defined as the ability to do work, and is responsible for causing change to a system. It is observed when it is being transferred or being transformed. It is conserved: work: formula = force x distance (joules (j)) Twice as much work is done in lifting 2 loads up 2 stories vs lifting 1 load up 2 stories because force is needed to lift twice the load is twice as much. Twice as much work is done in lifting a load 2 stories instead of 1 story because distance is twice as great: mechanical energy: Due to position or to motion, or a combination of these. 2 forms of mechanical energy: potential energy stored energy held in readiness with a potential for doing work, kinetic energy (energy of motion, gravitational potential energy:

Related Questions

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.

lilacplatypus580

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 30^o 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?

greycrab71

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

whitemosquito79

CHIR114 Lecture Notes - Lecture 1: Kinetic Energy, Potential Energy

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