Podcast
Questions and Answers
What is the motion that travels in a straight line?
What is the motion that travels in a straight line?
What is the motion that travels in a circular motion?
What is the motion that travels in a circular motion?
______ is the distance traveled in a straight line per unit of time.
______ is the distance traveled in a straight line per unit of time.
Linear speed
_______ is the distance traveled per unit of time.
_______ is the distance traveled per unit of time.
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The direction of a circular motion is ___________ of the circumference.
The direction of a circular motion is ___________ of the circumference.
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When an object travels about an internal axis, the motion is a ________ or a __________.
When an object travels about an internal axis, the motion is a ________ or a __________.
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Horse A is closer to the axis than Horse B, but they both have the same __________ in a merry-go-round.
Horse A is closer to the axis than Horse B, but they both have the same __________ in a merry-go-round.
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Revolution per minute are about what?
Revolution per minute are about what?
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______ states that a rotation will not stop unless an outside force acts upon it.
______ states that a rotation will not stop unless an outside force acts upon it.
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As radial distance increases, tangential speed ______.
As radial distance increases, tangential speed ______.
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As rotation speed increases, tangential speed _______.
As rotation speed increases, tangential speed _______.
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_______ is a change in tangential speed that indicates an acceleration in the direction of tangential motion.
_______ is a change in tangential speed that indicates an acceleration in the direction of tangential motion.
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_______ states an object rotating about an axis tends to remain rotating unless interfered with by some external influence.
_______ states an object rotating about an axis tends to remain rotating unless interfered with by some external influence.
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The greater the distance between the bulk of an object's mass and its axis of rotation, the _____ the rotational inertia.
The greater the distance between the bulk of an object's mass and its axis of rotation, the _____ the rotational inertia.
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______ is the product of the force and lever-arm distance, which tends to produce rotation.
______ is the product of the force and lever-arm distance, which tends to produce rotation.
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Wrenches and gears are examples of _______.
Wrenches and gears are examples of _______.
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______ is produced by this turning force and tends to produce rotational acceleration.
______ is produced by this turning force and tends to produce rotational acceleration.
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______ tend to make things accelerate.
______ tend to make things accelerate.
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If you apply the same force to each of these wrenches, the longest wrench would have the greatest torque because it has the __________.
If you apply the same force to each of these wrenches, the longest wrench would have the greatest torque because it has the __________.
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A pair of torques can ______ each other.
A pair of torques can ______ each other.
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_______ is where all the mass of an object can be considered to be concentrated.
_______ is where all the mass of an object can be considered to be concentrated.
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______ is the average position of all the particles of weight that make up an object.
______ is the average position of all the particles of weight that make up an object.
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The center of gravity is the _______ point.
The center of gravity is the _______ point.
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For ______ center of gravity must be over an area of support.
For ______ center of gravity must be over an area of support.
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The force directed toward a fixed center that causes an object to follow a circular path is called _______.
The force directed toward a fixed center that causes an object to follow a circular path is called _______.
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Greater speed and greater mass requires greater ________.
Greater speed and greater mass requires greater ________.
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Centripetal force = /
Centripetal force = /
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Centripetal force is measured in _________
Centripetal force is measured in _________
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Sometimes an outward force is also attributed to ________.
Sometimes an outward force is also attributed to ________.
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This apparent outward force on a rotating or revolving body is _____________.
This apparent outward force on a rotating or revolving body is _____________.
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Anything that rotates keeps on rotating until something stops it is ____________.
Anything that rotates keeps on rotating until something stops it is ____________.
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___________ is defined as the product of rotational inertia.
___________ is defined as the product of rotational inertia.
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_______ is a vector whose magnitude is the rotational speed.
_______ is a vector whose magnitude is the rotational speed.
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Angular momentum is a ______ quantity and has direction as well as magnitude.
Angular momentum is a ______ quantity and has direction as well as magnitude.
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The property of an object to resist change in a rotational motion is known as _______.
The property of an object to resist change in a rotational motion is known as _______.
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A measurement that measures distance traveled per unit of time in circular motion is called _______.
A measurement that measures distance traveled per unit of time in circular motion is called _______.
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Toss a baseball bat into the air and it wobbles about its _______.
Toss a baseball bat into the air and it wobbles about its _______.
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As rotational speed of a merry-go-round increases by 2, what will happen to tangential speed?
As rotational speed of a merry-go-round increases by 2, what will happen to tangential speed?
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Study Notes
Linear Motion
- Motion that travels in a straight line.
- Linear speed is defined as the distance traveled in a straight line per unit time.
Rotational Motion
- Motion that travels in a circular path.
- Involves concepts like tangential speed and rotational speed.
Tangential Speed
- Refers to the distance traveled along a circular path per unit of time.
- The tangential direction is perpendicular to the radius of the circle.
Rotation and Rotational Speed
- Rotation occurs when an object spins around an internal axis.
- Rotational speed can be affected by an object's distance from the axis; for example, horses on a merry-go-round have the same rotational speed regardless of their distance from the center.
Rotational Inertia
- Describes an object's tendency to maintain its state of rotation unless acted upon by an external force.
- Greater distance of mass from the axis increases rotational inertia.
Torque
- Defined as the product of force and lever-arm distance, which tends to produce rotation.
- Torque is crucial for achieving rotational acceleration. Longer lever arms yield greater torque.
Center of Mass and Center of Gravity
- The center of mass is the point where the mass of an object is concentrated.
- The center of gravity is the average position of an object's weight particles.
- Stability depends on the position of the center of gravity being over the base of support.
Centripetal Force
- The inward force that keeps an object moving in a circular path.
- Greater mass and speed require increased centripetal force, which can be calculated using the formula: (mass * speed²) / radius of curvature.
- Measured in newtons.
Circular Motion and Forces
- Circular motion can sometimes be confused with an apparent outward force called centrifugal force, which is not a true force but a result of rotational motion.
- Angular momentum describes the tendency of rotating objects to maintain their motion unless disrupted.
Angular Momentum
- Defined as the product of an object’s rotational inertia and rotational velocity.
- Angular momentum is a vector with both magnitude and direction.
Additional Concepts
- Tangential acceleration indicates a change in tangential speed in the direction of motion.
- An object wobbles about its center of mass during rotation.
- Changes in rotational speed affect tangential speed; for instance, if a merry-go-round's speed doubles, the tangential speed also increases proportionally.
Studying That Suits You
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Description
Test your knowledge of key concepts in Physics Chapter 8 with these flashcards. This quiz covers linear motion, rotational motion, and various terms related to speed. Perfect for students looking to reinforce their understanding of motion in physics.
