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Chapter 11/12 physics
Terms in this set (52)
Produced by a turning force
What produces rotational accelerattion
Distance from the turning axis
What happens when balanced torques act on an object?
There is no change in rotatation
Center of mass
All the mass of an object can be considered to be concentrated
Where is center of mass located
An objects average position of masd
Center of gravity
Average position of all particles of weight that make up an object
What happens if the center of gravity of an object is above the are of support
The object will remain upright
Where is the center of gravity for a person
It depends on body orientation
When an object is balanced so that any displacement lowers its center of mass
When an object is balanced so that any displacement raised its center of mass
When an object is balanced so that any small movement neither raises of lowers its center of gravity
What happens when an object is toppled
The center of gravity of that object is raised lowered or unchanged
How does torque differ from force
Forces tend to make things accelerate.
Torques produce rotation.
How to clockwise/ counter clockwise torques compare when a system is balanced
They are equal
What part of an object follows a smooth path when the object is made to spin through the air of across a flat smooth surface
the center of mass
Why is the center of mass of a baseball bat not at the midpoint
the center of mass is shifted towards the heavier end
Describe the motion of center of mass of a fire work projectile before and after explosion
The center of mass of the fireworks rocket and its fragments move along the same path before and after the explosion
When are center of gravity and center of mass the same
For almost all objects on and near Earth, these terms are interchangeable. There can be a small difference between center of gravity and center of mass when an object is large enough for gravity to vary from one part to another.
Where Is the center of mass for an object that hangs in equilibrium
The CG of the object will hang directly below (or at) the point of suspension
How far can an object be tipped before it topples over
An object topples when the CG extends beyond its support base
Is the gravitational potential energy more less or unchanged when the center of gravity of and object is raised
When an object's CG is raised, its gravitational potential energy increases. This means that you have to input energy (do work) to get this to happen
If a table of dried beans with a table tennis ball at the bottom is shaken what happens to the CG
If you shake a container of dried beans with a table-tennis ball in it, the table-tennis ball will "rise" to the top. As this happens, the CG of the system falls - because this reduces the gravitational potential energy of the system.
Resistance of an object to change its rotational motion
What is the difference between rotational inertia and inertia
Rotational Inertia depends on the distribution of mass not just mass
Vertical head to toe axis
What you rotate around when doing a flip
From to back axis
The product of mass and the velocity of an object
The product of rotational inertia
A vector who's magnitude is the rotational speed
Law of conservation of angular momentum
If no unbalanced external torque acts on a rotating system the angular momentum of that system is constant
Gravity one is acostumed to
The greater an objects rotational inertia the more difficult it is to...
Change its rotational speed
What are the the three principle axis of rotation in the human body
Longitudinal traverse and medial axis
How will objects of the same size but different sizes accelerate when rolled down an incline
What is Newton's first law of inertia for rotating systems
An object will maintain its angular momentum unless acted upon by an unbalanced external torqe
When is angular momentum conserved
When there is no net external torque acting on an a object
What can simulate gravity from within a rotational Frame of reference
Outwardly directed centrifugal force
What is the law of inertia for rotation
An object or system of objects will maintain its angular momentum unless acted upon by an unbalanced external torque.
How does the rotational inertia of an object relate to different axis of rotation
Greater distance from the axis means greater rotational inertia.
Is it easier to swing a bat heald at the end or one heald closer to the massive end
A long baseball bat held near its thinner end has more rotational inertia than a short bat of the same mass
What will swing more a long pendulum or short
The short pendulum will swing back and forth more frequently than the long pendulum
Why does bending your legs while running enable you to swing your legs more rapidly
You bend your legs when you run to reduce their rotational inertia. Bent legs are easier to swing back and forth.
How does a skater decrease his or her rotational inertia while spinning
it will remain the same by the conversion of rotational momentum
Will a hoop or a solid disk have a greater acceleration when rolling down an incline
Just as the value for a hoop's rotational inertia is greater than a solid cylinder's, the rotational inertia of a hollow sphere would be greater than that of a same-mass solid sphere for the same reason: the mass of the hollow sphere is farther from the center.
What is the difference between linear momentum and angular momentum
When is angular momentum conserved and what does that mean
Angular momentum is conserved when no external torque acts on an object
If a skater who is spinning pulls in her arms (reducing her rotational inertia to half) by how much will her angular momentum increase
it will remain the same by the conversion of rotational momentum
If a skater who is spinning pulls in her arms (reducing her rotational inertia to half) by how much will her rate of spin increase
Her rate of spin will double to offset the halved rotational inertia; whenever a body contracts, that is moves toward the axis, its rotational speed/velocity (w) increases.
What is the difference between rate of spin and angular momentum
For an object traveling in a circular path, its angular momentum doubles when its linear speed
doubles and its radius remains the same.
remains the same and its radius doubles.
and its radius remain the same and its mass doubles.
all of the above
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