1. Define the following along with their S.I. Units.
(i) acceleration
(ii) variable velocity
(iii) uniform speed
(iv) average acceleration
(v) deceleration or negative acceleration.
Answers
Answer:
(i) acceleration: Acceleration can be defined as the rate of change of velocity with time. It can also be defined as the increase in velocity per second. The S.I. unit of acceleration is meter per second square or ms -2.
(ii)variable Velocity: is defined as the rate of change of displacement of a body with respect to time. Its unit in SI is m/s.Velocity is a vector quantity that refers to the rate at which an object changes its position. It is a vector expression of the displacement that an object or particle undergoes with respect to time.
The SI unit of velocity is meter/second.
(iii) uniform speed: The SI unit of speed and velocity is the ratio of two — the meter per second. Explanation: A body is said to have uniform velocity if it covers equal distance in equal intervals of time in a particular direction, however the time intervals may be small.
(iv) average acceleration: Average acceleration is the rate at which velocity changes: ... (The bar over the a means average acceleration.) Because acceleration is velocity in meters divided by time in seconds, the SI units for acceleration are often abbreviated m/s2—that is, meters per second squared or meters per second per second.
(v) deceleration or negative acceleration: When the velocity decreases with respect to time it is termed as retardation or deceleration. In reality negative acceleration is commonly called retardation Its SI unit. is m/s2.
Explanation:
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