Is it easier to balance a long rod with a mass attached to it when the mass is closer to your hand or when the mass is farther away? It is easier when the mass is closer to your hand.
It is equally easy in both cases
. It is easier when the mass is farther from your hand.
How does the distribution of mass influence its balance?
The distribution of the mass of an object determines
the position of its center of gravity, its angular momentum
, and your ability to balance it.
How do clockwise and counterclockwise torques compare?
How do clockwise and counterclockwise torques compare when a system is balanced?
They are equal in magnitude and opposite in direction
.
How does the lever arm change when you decrease the distance to the nut?
How does the lever arm change when you decrease the distance to the nut? How does the force needed to turn the wrench change if you increase the lever arm?
It decreases
. It stays the same.
Why does the rotational inertia of the rod with the attached mass closer to your hand?
Rotational inertia depends on whether the mass is farther or closer to the point of rotation. … It is
easier for the performer to balance
a long rod held vertically with people at the other end because the rotational inertia is greater. The center of gravity of a basketball is located…
Is angular momentum always conserved?
Just as linear momentum is conserved when there is no net external forces,
angular momentum is constant or conserved when the net torque is zero
.
Does moment of inertia depend on mass?
The moment of inertia
depends not only on the object’s mass
, but also the distribution of that mass in relation to the axis of rotation. When an ice skater in a spin pulls their arms in, their mass stays the same, but their moment of inertia decreases.
Where is a person’s center of mass?
The center of mass of the human body depends on the gender and the position of the limbs. In a standing posture, it is typically
about 10 cm lower than the navel
, near the top of the hip bones.
Does it get easier or harder to rotate the stick as the mass gets farther from the pivot point?
it is
easier to rotate
a bar with a mass closer to the rotational point because it is closer to its center of mass and the lever arm is longer.
What is meant by mass distribution?
In physics and mechanics, mass distribution is
the spatial distribution of mass within a solid body
. In principle, it is relevant also for gases or liquids, but on earth their mass distribution is almost homogeneous.
Is clockwise left or right?
Clockwise involves a turn to the right
, following the direction of the hands of a clock. It is a negative rotation direction. Anticlockwise involves a turn to the left, against the direction of a clock’s hands.
Is clockwise positive or negative?
The rotation of a clock’s hands is the reference for defining rotational direction. Counterclockwise is the positive rotation direction and
clockwise is the negative direction
. For example, a torque that rotates an object counterclockwise is a positive torque (see figure 6 below).
Is clockwise positive or negative moment?
For the purposes of this activity, let us apply a sign convention: If a moment is moving ANTICLOCKWISE it is considered a POSITIVE moment. If a moment is
moving CLOCKWISE it is considered a NEGATIVE moment
.
What is the lever arm in torque?
Torque = Force applied x lever arm
The lever arm is defined as the perpendicular distance from the axis of rotation to the line of action of the force.
Where should a force be applied on a lever arm to produce the least torque?
A perpendicular push or pull gives more rotation for less effort. If the force is not at right angle to the lever arm, then
only the perpendicular component of the force
will contribute to the torque.
What are the conditions under which torque is zero?
System of Particles and Rotational Motion. Under what condition torque acting on body by a given force is zero? That is, Torque = 0. That is,
when line of action of forces passes through the axis of rotation
, torque is zero.
