(2.0-2(5-27119) 1127H4 3 True and False: 4 Points Each Any answers NOT recorded

Question

(2.0-2(5-27119) 1127H4 3 True and False: 4 Points Each Any answers NOT recorded on the Scantron answer page will NOT be counted 1. Potential energy is the energy of position. A) TrueB) False According to the work-energy theorem, the work done by friction on an object is always positit A) True B) Fals 2. 3. When only the force of gravity does work, the total mechanical energy is conserved B) False 4. The magnitude of the work done by a force can be expressed as W- APE A) TrueB) False 5. If the vector sum of the external forces on a system is zero, the total momentum of the system is constan A) True B) False 6. Centripetal and Tangential accelerations are the same thing A) True B) False 7. If the sotal momentum of a system is conserved in a collision, but the total kinetic energy is not, then the collision is elastic. A) True False 8. If the rotational kinetic energy of a rigid body doubles, the angular velocity will increase by a factor of 1.4. B) False

Explanation / Answer

1) Potential energy is the energy associated with the configuration of the system

so its TRUE.

2) Work energy theorm is Change in Kinetic Energy = Work done

and kinetic energy is the energy associated with the motion of object so due to friction force motion is always opposed so here work done by friction will always be negative.

so its TRUE.

3) when only gravitational force is doing the work then mechanical energy will always be conserved.

so its TRUE.

4) work done by conservative force is negative change in potential energy where as work done by non conservative force is change in potential energy if kinetic energy is not changed.

so its TRUE for non conservative forces.

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