Essential Physics Definitions: Motion and Friction Explained
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Fundamental Definitions in Kinematics
Define any three of the following terms: a) Velocity, b) Acceleration, c) Uniform acceleration, d) Variable acceleration, e) Rectilinear motion, f) Static friction, g) Dynamic friction.
- a) Velocity: The velocity of a body is its speed in a given direction.
- b) Acceleration: The rate of change of velocity over time.
- Formula: a = (v - u) / t
- a = acceleration in m/s²
- v = final velocity in m/s
- u = initial velocity in m/s
- t = time taken in seconds (s)
- c) Uniform Acceleration: If the velocity of a body changes by an equal amount in equal intervals of time, however small the interval may be, its acceleration is said to be uniform.
- d) Variable Acceleration: When changes in the velocity of an object are not the same at equal