Circular motion and Gravitation (PHY1031F,PHY1023H,PHY1032F)
Summary
Summary Circular motion and Gravitation
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Course
Circular motion and Gravitation (PHY1031F,PHY1023H,PHY1032F)
Institution
University Of Cape Town (UCT)
Book
Cambridge International AS and A Level Physics Coursebook
This is a summary for things you need to know under gravitation and orbital motion. It includes the following:
- Important definitions regarding circular motion
- Important derivations including centripetal force, tangential velocity, angular velocity, etc...
- Universal law of gravitation
Presentation on Collisions (Physics Cambridge AS/A-level Course)
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University Of Cape Town (UCT)
Circular motion and Gravitation (PHY1031F,PHY1023H,PHY1032F)
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Circular motion & Gravitation- A summary.
• Radian: When arc length is equal to the radial length, the angel subtended at the centre of
the circle is a radian.
• Angular speed (ω): This is the rate of change of angular displacement (θ). It is measured
in rads-1.
• Centripetal force(Fc): Force associated with objects moving in a circular motion; it is
directed towards the centre.
Figure 1
Important formulae and relationships
• Tangential speed(v): The linear speed of an object moving in a circular motion.
𝑣 = 𝜔𝑟
Figure 2
• Centripetal acceleration(a): This is the acceleration caused by an object moving in a
circular motion, it is always directed towards the centre of the circle.
𝑎 = 𝜔2 𝑟
• Period(T): This is the time taken to complete one full rotation, i.e., 360ᵒ or 2π radians
Relationship between vt, ω, and T.
1. v,ω and r
𝑣 = 𝜔𝑟
𝜔 = 𝑣𝑟
, 𝑎 = 𝜔2 𝑟
𝑣2
𝑎= ⋅𝛾
𝑟2
𝑣2
𝑎=
𝑟
2. Fc, a, ω and v
𝐹𝑐 = 𝑚𝑎
𝑎 = 𝜔2 𝑟 𝑜𝑟 𝑎 = 𝜔2 𝑟
𝑚𝑣 2
𝐹𝑐 = 𝑚𝜔2 𝑟 𝑜𝑟 𝐹𝐶 =
𝑟
3. T and ω
2𝜋
𝑇=
𝜔
Gravitation
The universal law of gravitation:
“In the universe, every object attracts every other object with a force that is directly proportional
to the product of the masses of the objects, and indirectly proportional to the square of the
distance between them.”
Figure 3
From the law:
𝐹 ∝ m1 m2
1
𝐹∝
𝑟2
𝑚1 𝑚2
𝐹∝
𝑟2
𝐺𝑚1 𝑚2
𝐹=
𝑟2
Where G is the universal gravitational constant. It has the value: 𝐺 = 6.67 × 10−11 𝑁𝑚2 𝑘𝑔−2 .
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