BYU Physics 121 Chapter 12 Conceptual
Questions and answers 100% correct
2025
In solving a torque balancing homework problem for a beam in static
equilibrium, where must we put the axis of rotation? - correct answer
✔Wherever we want to.
Consider a bicycle parked on a hill and pick the axis of rotation to pass
through the point where the front tire touches the ground. The weight of the
bicycle exerts a torque about this axis. What other forces on the bicycle will
also exert a torque about this axis? - correct answer ✔The normal force on
the back wheel only.
If only two forces act on a body and the body is in static equilibrium, which of
the
statements below must be true? - correct answer ✔D) The two forces must
be equal in magnitude and opposite in direction to satisfy the first condition of
equilibrium, that all the forces must cancel. The second condition, that the
torques must cancel, requires that they act along the same line. If they acted
along different lines, then they would create a net torque.
a. The two forces are equal in magnitude and opposite in direction.
b. The two forces act along the same line.
c. The two forces must act in the same plane as each other.
d. Both a and b must be true
Why is it not possible to sit upright in a chair and then rise to one's feet without
first leaning forward? - correct answer ✔One has to move the center of
Questions and answers 100% correct
2025
In solving a torque balancing homework problem for a beam in static
equilibrium, where must we put the axis of rotation? - correct answer
✔Wherever we want to.
Consider a bicycle parked on a hill and pick the axis of rotation to pass
through the point where the front tire touches the ground. The weight of the
bicycle exerts a torque about this axis. What other forces on the bicycle will
also exert a torque about this axis? - correct answer ✔The normal force on
the back wheel only.
If only two forces act on a body and the body is in static equilibrium, which of
the
statements below must be true? - correct answer ✔D) The two forces must
be equal in magnitude and opposite in direction to satisfy the first condition of
equilibrium, that all the forces must cancel. The second condition, that the
torques must cancel, requires that they act along the same line. If they acted
along different lines, then they would create a net torque.
a. The two forces are equal in magnitude and opposite in direction.
b. The two forces act along the same line.
c. The two forces must act in the same plane as each other.
d. Both a and b must be true
Why is it not possible to sit upright in a chair and then rise to one's feet without
first leaning forward? - correct answer ✔One has to move the center of
