#physics #speed #acceleration #calculatingspeed
Pg:- 34,35,36
Ch:- 2 Textbook
Speed
Definition:
Speed is a scalar quantity that measures how fast an object is moving. It is the rate at which an object covers distance. Speed does not take into account the direction of motion.
Formula:
Speed = Distance/Time
Units:
The standard unit of speed is meters per second (m/s).
Other common units include kilometers per hour (km/h) and miles per hour (mph).
If a car travels 150 meters in 15 seconds, its speed is:
150meters/ 15 sec = 10m/s
Velocity:
Definition:
Though velocity is not speed, it is often discussed alongside it because it measures how fast an object moves and in what direction. Velocity is a vector quantity.
Formula:
Velocity = Displacement/time
Acceleration:
Definition:
Acceleration is a vector quantity that measures the rate of change of velocity over time. It indicates how quickly an object speeds up, slows down, or changes direction.
Acceleration = change in velocity/ Time taken
Units:
The standard unit of acceleration is meters per second squared (m/s²).
Types of Acceleration:
Positive Acceleration: When an object speeds up.
Negative Acceleration (Deceleration): When an object slows down.
Zero Acceleration: When an object moves at constant velocity.
How does velocity differ from acceleration?
What is uniform acceleration? Provide an example.
How can you determine the acceleration of an object from a velocity-time graph?
What factors can affect the speed of an object?
Describe a scenario where an object has a constant speed but changing velocity.
A person with his friend started from his house at 5 am and reached railway station which is 50 km away. First he travelled at 90km/hr for 20 min and then 120km/hr for 10 min.He dropped his friend at the station and started return journey to his house at 5.30 am and reached the house at 6.30 am. what is his speed for onward journey,return journey,average speed for the total journey, velocity of the onward journey,velocity of the return journey and velocity of the total journey?