Distance, Speed & Time

Distance

• Distance is the total path covered by the object in the given interval of time.
• Displacement is the shortest path covered by the moving object in the given interval of time.
• Distance=Speed × Time.
• Unit of distance is generally measured in units of length like metres, kilometres etc.

Speed (Average Speed)

• Speed is the total distance travelled by the object in a given interval of time.
• Speed = Distance travelled/time taken.
• The unit of speed is generally measured in metres per second(m/s), kilometres per hour(km/h).

Measurement of Time

• The unit of time is generally measured in seconds, minutes, and hours.
• The time period is the total time taken by an object to complete one oscillation.

Units of Time

The unit of time is generally measured in seconds, minutes, and hours.

Units of Speed

• Speed = Distance travelled in the total time interval.
• The unit of speed is generally measured in metres per second (m/s) and km/h( kilometre per hour).

Basics of Standard Units

Units and their standardization

• The standard unit of distance is in metres.
• The standard unit of time is in seconds (s).
• The standard unit of speed is in metres per second (m/s).

Speedometer and Odometer

• The speedometer records the speed of the vehicle directly in kilometres per hour (km/h).
• An odometer measures the distance moved by the vehicle directly in kilometres(km).

Visualizing Motion

Distance-time graph

• A distance-time graph is a graph plotted between the distance( in the y-axis) and time ( in the x-axis).
• The slope of a distance-time graph gives the speed of an object.