PHYS UN1401 Lecture Notes - Lecture 10: Fiz Brown, Xz, Weak Interaction

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4 Jan 2020

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If a force f moves an object through a distance d in the direction of work is done on the object the force , Fd ( w ) = if ] ( d ) = nm = joule j. If the direction of motion opposes the force , the work done is negative. W = f. d- = fd cos 0. Imagine i have a mass m that starts with velocity v : for a distance d on this object . Vf = vi t at vt- = t x - x o. = d = vit t eat a d-- uinta + z a (vt. D= vt vi - vi a- a- t ta ( ve "t vi - 24. W = kt - ki work done on mass = change in its kinetic energy. Force f = f ( x ) variable force. Work done to move the body from x to xtdx.

Related Questions

Part A: Find vf, the final speed of the particle after it has traveled a distance D. Express the final speed in terms of vi, M, F, and D.

Part B: By what multiplicative factor RK does the initial kinetic energy increase, and by what multiplicative factor RW does the work done by the force increase (with respect to the case when the particle had a mass M)? If one of the quantities doubles, for instance, it would increase by a factor of 2. If a quantity stays the same, then the multiplicative factor would be 1. You should enter the two factors separated by a comma.

Part C: The particle's change in speed over the distance D will be ______ the change in speed when it had a mass equal to M.

Part D: By what factor RK does the initial kinetic energy increase (with respect to the first situation, with mass M and speed vi), and by what factor RW does the work done by the force increase? Again, enter the two factors, separated by

azurefish181

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

PHYS UN1401 Lecture Notes - Lecture 10: Fiz Brown, Xz, Weak Interaction

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