MOTION

What is acceleration ? Write S I unit and CGS unit of acceleration .

Acceleration Definition The rate of change of velocity with respect to time. Acceleration is a vector quantity as it has both magnitude and direction. Formula of Acceleration : – Average acceleration The average acceleration over a period of time is defined as the total change in velocity is divided by the total time taken . …

What is acceleration ? Write S I unit and CGS unit of acceleration . Read More »

Usha swims in a 90 m long pool. She covers 180 m in one minute by swimming from one end to the other and back along the same straight path. Find the average speed and average velocity of Usha.

Solution:Total distance covered by Usha in 1 min is 180 m.Displacement of Usha in 1 min = 0 mAverage speed = Total distance covered / Total time taken = 180 m / 1 min = 180 m / 60 s = 3 m s-1Average velocity = Displacement / Total time taken = 0 m / …

Usha swims in a 90 m long pool. She covers 180 m in one minute by swimming from one end to the other and back along the same straight path. Find the average speed and average velocity of Usha. Read More »

The odometer of a car reads 2000 km at the start of a trip and 2400 km at the end of the trip. If the trip took 8 h, calculate the average speed of the car in km h–1 and m s–1 .

Solution:Distance covered by the car,s = 2400 km – 2000 km = 400 kmTime elapsed, t = 8 hAverage speed of the car is, vav = s / t =400 km / 8 h = 50 km h–1 = 50 x 1000 m / 3600 s = 13.9 m s–1 The average speed of the …

The odometer of a car reads 2000 km at the start of a trip and 2400 km at the end of the trip. If the trip took 8 h, calculate the average speed of the car in km h–1 and m s–1 . Read More »

Average velocity

“Average velocity is given by the arithmetic mean of initial velocity and final velocity for a given period of time.” That is Average Velocity =Total Displacement​ / Total Time takenMathematically, Speed and velocity have the same units, S I unit is m s–1 or m/s CGS unit of velocity is cm/s or, cms-1

An object travels 16 m in 4 s and then another 16 m in 2 s. What is the average speed of the object?

Solution: Total distance travelled by the object =16 m + 16 m = 32 mTotal time taken = 4 s + 2 s = 6 s Average speed =Total distance travelled / Total time taken = 32 m / 6 s = 5.33 m s–1Therefore, the average speed of the object is 5.33 m s–1. …

An object travels 16 m in 4 s and then another 16 m in 2 s. What is the average speed of the object? Read More »

Average speed

The average speed of an object is obtained by dividing the total distance travelled by the total time taken. That is, average speed = Total distance travelled / Total time takenIf an object travels a distance s in time t thenits speed v is, v = s/tLet us understand this by an example. A car …

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