Tension is the macroscopic net result of forces that segments of a string, cable, chain or similar system exert on each other in response to an external force .

Define ideal pulley .

An ideal pulley has negligible mass and rotates about an axle through its center of mass with negligible friction .

What external forces often give rise to tension in a horizontal string system?

Friction or another contact force .

What does a pulley enable for objects attached to a string, cable or chain?

Motion of the attached objects Change in direction of the attached objects

When a string is under tension, there are .......... forces between oppositely charged particles.

When a string is under tension, there are attractive forces between oppositely charged particles.

True or False? An ideal pulley's mass is part of the mass of the system.

False. An ideal pulley has negligible mass , so it is not considered part of the mass of the system.

Define ideal string .

An ideal string has negligible mass and does not stretch when under tension.

How does tension vary along an ideal string ?

The tension is the same at all points within the string.

How does tension vary along a non-ideal string , and why?

The tension may not be the same at all points, because the string has nonnegligible mass .

Why are ideal strings used in model systems?

They simplify calculations , even though an ideal string does not exist in reality.

An ideal string is described as .......... because it does not stretch under tension.

An ideal string is described as inextensible because it does not stretch under tension.

True or False? A real string extends by the same amount at every point.

False. In reality all strings are non-ideal , so there is more extension at some points than at others.

AP®PhysicsCollege BoardPhysics 1: Algebra-BasedFlashcardsUnit 2: Force & Translational DynamicsTension

Tension (College Board AP® Physics 1: Algebra-Based): Flashcards

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Cards in this collection (13)

Define tension.
Tension is the macroscopic net result of forces that segments of a string, cable, chain or similar system exert on each other in response to an external force.
Define ideal pulley.
An ideal pulley has negligible mass and rotates about an axle through its center of mass with negligible friction.
What external force often gives rise to tension in a vertical string system?
The gravitational force.
What external forces often give rise to tension in a horizontal string system?
Friction or another contact force.
What does a pulley enable for objects attached to a string, cable or chain?
- Motion of the attached objects
- Change in direction of the attached objects
When a string is under tension, there are .......... forces between oppositely charged particles.
When a string is under tension, there are attractive forces between oppositely charged particles.
True or False?
An ideal pulley's mass is part of the mass of the system.
False.
An ideal pulley has negligible mass, so it is not considered part of the mass of the system.
Define ideal string.
An ideal string has negligible mass and does not stretch when under tension.
How does tension vary along an ideal string?
The tension is the same at all points within the string.
How does tension vary along a non-ideal string, and why?
The tension may not be the same at all points, because the string has nonnegligible mass.
Why are ideal strings used in model systems?
They simplify calculations, even though an ideal string does not exist in reality.
An ideal string is described as .......... because it does not stretch under tension.
An ideal string is described as inextensible because it does not stretch under tension.
True or False?
A real string extends by the same amount at every point.
False.
In reality all strings are non-ideal, so there is more extension at some points than at others.

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