CAS PY 211 Final: PY211 Final Study Guide

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violetlion400

10 Feb 2017

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Work kinetic energy theorem: k = wnet (units = j) Work involves the component of the force that is parallel to the displacement. Two ropes are used to lower a steel beam a distance m at constant speed. There are three forces (t1, t2 ad fg), so three components of work. Car driving up a hill at constant speed. Total work done on car by all forces as it moves up hill is 0. Pav = w/ t (units = w (j/s): the rate of energy transfer. Kinetic and energy: depends of mass and speed of object: k = mv2, k = mv2 (unit = j (kgm2/s2)) Work and potential energy: depends on the mass and position of object: ug = mgh (unit = j (kgm2/s2), conservative force: if the work is independent of the path taken. Potential e for this force: u = -w.

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

whitemosquito79

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

A 1250 kg car drives up a hill that is 16.2 m high. During thedrive, two nonconservative forces do work on the car: (i) the forceof friction, and (ii) the force generated by the car's engine. Thework done by friction is -3.11Ã10^5 J; the work done by the engineis 6.44Ã10^5 J. Find the change in the car's kinetic energy fromthe bottom of the hill to the top of the hill.
?K=____J

CAS PY 211 Final: PY211 Final Study Guide

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