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- is the work done per unit mass in bringing a mass from infinity to a point

- greek letter phi = symbol for potential

- gravitational potential is ALWAYS -ve because mass is brought towards another mass. gpe decreases. gpe at infinity = 0 anywhere else gpe and potential are <0.

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We use the symbol ω (Greek letter omega) for angular
velocity, measured in radians per second (rads−1).

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Speed - Scalar quantity (magnitude only)

Velocity - Vector quantity (magnitude + direction)

The arrows are straight and show the direction of motion at a particular instant. They are drawn as tangents to the circular path. As the object travels through points A, B, C, etc., its speed remains constant but its direction changes. Since the direction of the velocity v is changing, it follows
that v itself (a vector quantity) is changing as the object moves in a circle.

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- if the distance doubled 2x, lines are spread out over 4x the surface area

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One radian is the angle subtended at the centre of a circle
by an arc of length equal to the radius of the circle.

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It is more
convenient to measure angles and angular displacements
in units called radians rather than in degrees.

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The angle θ through which the object has moved

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8.1 (a(ii)) defining GF strength as "force/mass"

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8.1 (a(ii)) defining GF strength as "force/mass"

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-Gravitational field strength is the gravitational force exerted per unit mass on a small object placed at a point

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or maybe it can be... Mr Bean moving in circle in a washing machine!

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or maybe it can be... Mr Bean moving in circle in a washing machine!

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8.1 (a(i)) - understanding concept gravitational as an e.g of a field of force  

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8.1 (a(i)) - understanding concept gravitational as an e.g of a field of force  

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- spacing between field line = strength of gravitational field

- line inward = all objects attracted to centre of earth

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Things that move in circle.

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EXAM STYLES QUESTION

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CENTRIPETAL ACCELERATION AND CENTRIPETAL FORCE

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CENTRIPETAL ACCELERATION AND CENTRIPETAL FORCE

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Problem solving
(Questions and Answers)

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What is a centripetal force? (article) | Khan Academy

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Determine the distance of a satellite in Geostationary Orbit using the equation ;  

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Determine the distance of a satellite in Geostationary Orbit using the equation ;  

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A base station
on Earth sends the TV signal up to the satellite, where it
is amplified and broadcast back to the ground

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A special type of orbit is one in which a satellite is
positioned so that, as it orbits, the Earth rotates below
it at the same rate.

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EXAMPLES

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Functions of satellites

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In order for a satellite to maintain a
particular orbit, it must travel at the correct speed

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The square of the period is directly
proportional to the cube of the radius

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Substitute the v as v^2

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To find the T

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the time taken for a
complete orbit, the orbital period T

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The Centripetal Force is Equal to the Force between two point masses

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To calculate the speed at which an object has to move to stay in the circular motion

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For an object orbiting a planet, such as an artifiicial satellite
orbiting the Earth, gravity provides the centripetal force
which keeps it in orbit

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*Concise notes
(By Muhammad Naqib Bin Salim)