Can anyone teach me motion- formulas, concepts for grade 9 physics, other chapters like gravitation, force and laws of motion. I need help
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Answer:
Reference point and reference frame
To describe the position of an object we need a reference point or origin. An object may seem to be moving to one observer and stationary to another.
Example: A passenger inside a bus sees the other passengers be at rest, whereas an observer outside the bus sees the passengers are in motion.
In order to make observations easy, a convention or a common reference point or frame is needed. All objects must be in the same reference frameforce
Distance and Displacement
The magnitude of the length covered by a moving object is called distance. It has no direction.
Displacement is the shortest distance between two points or the distance between the starting and final positions with respect to time. It has magnitude as well direction.
Displacement can be zero, but distance cannot.
Distance and Displacement
Distance VS Displacement
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Magnitude
Magnitude is the size or extent of a physical quantity. In physics, we have scalar and vector quantities.
Scalar quantities are only expressed as magnitude. E.g: time, distance, mass, temperature, area, volume
Vector quantities are expressed in magnitude as well as the direction of the object. E.g: Velocity, displacement, weight, momentum, force, acceleration, etc.
Time, Average Speed and Velocity
Time and speed
Time is the duration of an event that is expressed in seconds. Most physical phenomena occur with respect to time. It is a scalar quantity.
Speed is the rate of change of distance. If a body covers a certain distance in a certain amount of time, its speed is given by
Speed = DistanceTime
Average speed = Total distance travelled / Total time taken
Uniform motion and non-uniform motion
When an object covers equal distances in equal intervals of time it is in uniform motion.
When an object covers unequal distances in equal intervals of time it is said to be in non-uniform motion.
To know more about Uniform Motion and Non-Uniform Motion, visit here.
Velocity
The Rate of change of displacement is velocity. It is a vector quantity. Here the direction of motion is specified.
Velocity = DisplacementTime
Average velocity = (Initial Velocity + Final velocity)/2 = u+v2.
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