1. Under which circumstance does the center of gravity of an object coincide wit
ID: 1523226 • Letter: 1
Question
1. Under which circumstance does the center of gravity of an object coincide with the center of mass?
a. when the mass is uniformly distributed
b.when the center of mass is located inside the object
c. when the value of the gravitational acceleration is the same throughout the object
2. If the net force and the net torque on a moving object are both zero, can the object be in static equilibrium?
a. yes
b. No
3. If an object is to be in equilibrium, which of the following must be true of the linear momentum of its center of mass?
a.must be increasing at a steady rate
b.must be decreasing at a steady rate
c.must be constant
4. If an object is to be in equilibrium, which of the following must be true of its angular momentum about any point?
a.must be increasing at a steady rate
b.must be decreasing at a steady rate
c.must be constant
5.If the net torque on an object is zero when calculated about the object’s center of mass, can it be nonzero when calculated about some other point?
a. Yes
b. No
6. If you choose a rotation axis to be at the point where a force is applied, is the torque associated with that force necessarily zero?
a. yes
b. No
7.What is a line of action?
a.a line that is perpendicular to the length of a force vector
b.a line that extends through the length of a force vector
8. What is a moment arm?
a.a line that extends through the length of a force vector
b.a line that is perpendicular to the length of a force vector
9.If the net torque on a stationary object is positive, in which direction does the object begin to rotate?
a. clockwise
c. when the value of the gravitational acceleration is the same throughout the object
2. If the net force and the net torque on a moving object are both zero, can the object be in static equilibrium?
a. yes
b. No
3. If an object is to be in equilibrium, which of the following must be true of the linear momentum of its center of mass?
a.must be increasing at a steady rate
b.must be decreasing at a steady rate
c.must be constant
4. If an object is to be in equilibrium, which of the following must be true of its angular momentum about any point?
a.must be increasing at a steady rate
b.must be decreasing at a steady rate
c.must be constant
5.If the net torque on an object is zero when calculated about the object’s center of mass, can it be nonzero when calculated about some other point?
a. Yes
b. No
6. If you choose a rotation axis to be at the point where a force is applied, is the torque associated with that force necessarily zero?
a. yes
b. No
7.What is a line of action?
a.a line that is perpendicular to the length of a force vector
b.a line that extends through the length of a force vector
8. What is a moment arm?
a.a line that extends through the length of a force vector
b.a line that is perpendicular to the length of a force vector
9.If the net torque on a stationary object is positive, in which direction does the object begin to rotate?
a. clockwise
b. counterclockwiseExplanation / Answer
1) if the acceleration due to gravity is constant. ------------option C is correct
2) No --------------------option B is correct
3) must be constant-----------------option C is correct
4) must be constant-----------------option C is correct
5) yes ------------- option A is correct
6) yes------------------option A is correct
7) a line that extends through the length of a force vector ------------option B is correct
8) a line that is perpendicular to the length of a force vector----------------option B is correct
9) counterclockwise----------------option B is correct
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