1) the quantity 1/2mv2 is ? A:the linear kinetic energy of an object of mass M m

Question

1) the quantity 1/2mv2 is ?
A:the linear kinetic energy of an object of mass M moving at speed V.
B:the potential energy of an object of mass M moving at speed V.
C:the moment of inertia of an object of mass M moving at speed V.
D:the impulse the object has when it hits another object.

2) which of the following is not a conserved quantity in nature?
A: Linear Momentum B: Angular momentum C: gravity D: energy

3) a ball falls from the top of a building through the air, to the ground below. How does the kinetic energy it has just before striking the ground compare to the potential energy it had at the top of the building?
A: KE is equal to PE B: KE is greater than PE C: KE is less than PE D: cant tell
4) what is the quantity used to measure a rigid object's resistance to being rotated?
A) mass B) moment of inertia C) torque D) angular velocity

5) if a constant non zero net torque is applied to an object that object will
A) rotate with constant angular velocity B) rotate with constant angular acceleration
C) have an increasing moment of inertia D) have a decreasing moment of inertia.

6) twp equal forces are applied to a common door, the first force is applied midway between the doorknob and the hinge the second force is applied at the doorknob. both forces applied perpendicular to the door. Which one exerts greater torque about the hinges?

7) a boy and a girl on a playground are playing on an un motorized rotating platform of radius 3.0m as you observe them the platform is turning at constant angular speed with the boy hanging off he outer edge and the girl near the center( answer the following):
i) over the course of 1 rotation who has the greater angular displacement ?
ii) who has the greater angular velocity ?
iii) who has the greater linear velocity ?
iv) who experience greater centripetal acceleration ?
v) who has greater tangential acceleration ?

8) just before the projectile lands which of the following is true:
i) the horizontal velocity is zero
ii) the vertical velocity is zero
iii) the magnitude of the velocity is v=0, but its direction has changed
iv) the magnitude and direction of its velocity is the same as when it was launched

9) at any point during the flight of a projectile which of the following is true:
i) its horizontal speed is constant
ii) its vertical acceleration is constant
iii) its total energy is constant (KE+PE)
iv) all of above

Explanation / Answer

1) A

2) C

3) A

4) B

5) B

6) The second force that is applied at the doorknob

7) i) the boy

   ii) The girl

iii) The boy

  iV) The girl

V) The boy

8) i

9) iv

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