Circular Motion Video 1
- The force of gravity is a force of attraction between any two masses.
- Gravity gets stronger with greater mass, and weaker with greater distance. The equation for this is:
- Make sure you can answer questions such as: If the distance between two masses doubles, what will happen to the force of gravity between them? (Answer: since distance is squared on the bottom, the force will be 1/4 as large.)
For an object traveling in uniform circular motion:
- The force and the acceleration are centripetal (pointing towards the center) , and the velocity is tangent to the curve.
- The acceleration is found by using the equation a = v2/r.
- Fnet = ma can be replaced by Fnet = mv2/r.
- For a car on a circular track, Fnet = ma becomes Ff = mv2/r.
- For orbits, Fnet = ma becomes Fg = mv2/r.