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Physics > 5.12 Out Into Space > Flashcards

5.12 Out Into Space Flashcards

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1
Q

What is 360 degrees in radians?

A

2 pi

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2
Q

Definition of angular velocity?

A

Angle an object rotates through per second

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3
Q

What equation links linear and angular velocity?

A

Linear velocity =radius x angular velocity

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4
Q

Equation to calculate angular velocity?

A

Angular velocity=angle in radians/times in seconds

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5
Q

What does the symbol for angular velocity look like?

A

Omega (curly w)

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6
Q

What is frequency in circular motion?

A

Number of revolutions per second

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7
Q

What is the unit of frequency?

A

Hertz

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8
Q

What is the time period in circular motion?

A

Time taken for a revolution

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9
Q

What equation links period and frequnecy

A

f=1/T

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10
Q

Why is an object travelling in a circle accelerating even at constant speed?

A

Its velocity is changing as its direction is changing

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11
Q

What is the name for acceleration in a circle?

A

Centripetal acceleration

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12
Q

Where is centripetal acceleration directed?

A

Towards the centre of circle

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13
Q

What is centripetal acceleration produced by?

A

A centripetal force acting towards the centre of the circle

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14
Q

What is a gravitational field?

A

Region where an object will experience a non contact force

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15
Q

What force will an object experience if you put it in the gravitational force of another object?

A

Attractive

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16
Q

What is a uniform field? How are the field linescshown?

A

Field is the same every where

Lines are parralel and equally spaced

17
Q

What type of field do spjerical objects have?

A

Radial

18
Q

What can we assume about earths gravitational field close to the surface?

A

Uniform

19
Q

What type of law is the law of gravitation?

A

Inverse square law

20
Q

Whats the gravitational field strength definition?

A

Force per unit mass

21
Q

Why can we assume g is constant on earth?

A

Uniform field if you dont go to high

22
Q

What can be said about the force a mass experiences in a uniform field?

A

Constant

23
Q

What equation can we use to model force experienced in a uniform field?

A

F=mg

24
Q

What is potential energy proportional to in a uniform gravitational field?

A

Height

25
Q

Whats the equation for gravitational potnetial energy?

A

Change in e grav=mgh

26
Q

If an object is thrown up in a gravitational field how does the energy transfer?

A

Initial is all kinetic, transfers to potential as it gains height,stops gaining height when all kinetic transferred to potential and then reverse happens.

27
Q

How are g and r related in an inverse square law?

A

Gravitational field is inversely proportional to radius

28
Q

What can we define gravitational potnetional energy as at a given point?

A

Work needed to be done to move it from infinity to that point

29
Q

What is gravitational potmetial?

A

GPE per unit mass

30
Q

What are equipotentials?

A

Point in a field with the same gravitational potential

31
Q

What can be said about the transfer of energy when travelling along an equipotential?

A

Energy is constant, no work is done

32
Q

What are equipotenials perpendicular to ?

A

Field lines

33
Q

What is a satellite

A

A smaller mass that orbits a much larger mass

34
Q

Whats a geostationary sattelite?

A

A satellite that orbits earth once a day so appears stationary in the sky

35
Q

What does the area of a g against r graph show?

A

Gravitational potential

36
Q

What does the gradient of a GPE against r show?

A

Force

37
Q

What is the shape of all gravitation against radius graph?

A

Inverse curve under the bottom right quadrant as g is negative

38
Q

Why is no work done when moving along equipotentials?

A

Force is perpendicular to displacement so no work done as: W=FS

Physics (18 decks)

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