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Dance Anatomy > physics sags > Flashcards

physics sags Flashcards

0
Q

Scalar

A

A physical quantity that has magnitude only

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1
Q

Vector

A

A physical quantity that has both magnitude and direction

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2
Q

Resultant vector

A

The single vector which has the same effect as the original vectors working together

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3
Q

Distance

A

The length of path travelled (scalar)

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4
Q

Displacement

A

A change in position (vector, points from initial to final position)

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5
Q

Speed

A

The rate of change of distance (scalar)

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6
Q

Velocity

A

The rate of change of position
Or the rate of displacement
Vector

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7
Q

Acceleration

A

The rate of change of velocity

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8
Q

Coulomb’s law

A

The force between two charges is directly proportional to the product of the charges and is inversely proportional to the square of the distance between them

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9
Q

Electric field

A

A region of space in which an electric charge experiences a force. The direction of the electric field at a point is the direction a positive test charge would move if placed at that point

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10
Q

Electric field strength (magnitude)

A

The force per unit positive charge

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11
Q

Weight Fg

A

The gravitational force the earth exerts on any object on or near its surface

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12
Q

Normal force Fn

A

The perpendicular force exerted by a surface on an object in contact with it

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13
Q

Frictional force Ff

A

The force that opposes the motion of the object

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14
Q

Newton’s first law

A

An object continues in a state of rest or uniform velocity unless it is acted upon by a resultant force

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15
Q

Inertia

A

The property of an object that causes it to resist changes in its state of rest or uniform motion

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16
Q

Newton’s second law

Motion

A

When a force Fnet is applied to an object mass m it accelerates in the direction of the net force. The acceleration a is directly proportional to the net force and inversely proportional to the mass

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17
Q

Newton’s second law

Momentum

A

The net force acting on an object is equal to the rate of change of momentum

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18
Q

Newton’s third law

A

When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A

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19
Q

Momentum

A

The product of the mass and velocity of the object

20
Q

The law of conservation of linear momentum

A

The total linear momentum of an isolated system remains constant

21
Q

Elastic collision

A

A collision in which both momentum and kinetic energy are conserved

22
Q

Inelastic collision

A

A collision in which only momentum is conserved

23
Q

Impulse

A

The product of the net force and the contact time

24
Q

Work

A

The product of the displacement and the component of the force parallel to the displacement

25
Q

Gravitational potential energy

A

The energy an object possesses due to its position relative to a reference point

26
Q

Kinetic energy

A

The energy an object has as a result of the objects motion

27
Q

Mechanical energy

A

The sum of gravitational potential and kinetic energy at a point

28
Q

The law of conservation of energy

A

The total energy in a system cannot be created or destroyed, only transferred from one form to another

29
Q

The principle of conservation of mechanical energy

A

In the absence of air resistance or Amy external forces, mechanical energy of an object is constant

30
Q

Work energy theorem

A

The work done by a net force on an object is equal to the change in kinetic energy of the object

31
Q

Power

A

The rate at which work is done

The rate at which energy is transferred

32
Q

1 Watt

A

The power when one joule of work is done in one second

33
Q

Efficiency

A

The ratio of output power to input power

34
Q

Newtons law of universal gravitation

A

Every particle in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres

35
Q

Potential difference

A

The work done per unit positive test charge

36
Q

Current

A

The rate of flow of charge

37
Q

Ohms law

A

Current through a conductor is directly proportional to the potential difference across a conductor at a constant temperature

38
Q

Resistance

A

A materials opposition to the flow of electric current

39
Q

Emf

A

The total energy supplied per coulomb of charge by the cell

40
Q

Magnetic flux linkage

A

The product of the number of turns on the coil and the flux through the coil

41
Q

Faradays law of electromagnetic induction

A

The emf induced is directly proportional to the rate of change of magnetic flux (flux linkage)

42
Q

Lenz’s law

A

The induced current flows in a direction so as to set up a magnetic field to oppose the change in magnetic flux

43
Q

Diode

A

A component that only allows current to flow in one direction

44
Q

The photoelectric effect

A

The process when light shines on a metal and electrons are ejected

45
Q

Threshold (cut off) frequency

A

The minimum frequency of incident radiation at which electrons will be emitted from a particular metal

46
Q

Work function

A

The minimum amount of energy needed to emit an electron from the surface of a metal
Material specific

47
Q

One Volt

A

Is the potential difference between two points where 1J of work is done per coulomb of charge transferred from some point to the other.

Dance Anatomy (2 decks)

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