Q: The accelerated motion of a body can occur :

The accelerated motion of a body can occur due to a change in its speed only, due to change in direction of motion only, and due to change in both speed and direction of motion. In the uniform circular motion, the direction of speed changes continuously though the speed is constant, still, the motion is accelerated.

Q: Unit for the rate of change of velocity is

Velocity units \$ = m/s\$Acceleration is the rate of change of velocitya \$= \dfrac{change \ in \ velocity }{time } \$Therefore SI units of acceleration is \$ms^{-1}/s = \dfrac{m}{s^2} \$

Q: A car starting from rest acquires a velocity \$180\ m s^{-1}\$ in 0.05 h. Find the acceleration.

Acceleration, \$a = \dfrac{180 m/s}{0.05\times 3600 s} = 1 m/s^2 \$

Q: Unit of acceleration is

acceleration \$ = \dfrac{dv}{dt}\$Units of 'v' is m/s and 't' is secondsTherefore units of acceleration is \$\dfrac{m}{s^2} \$

Q: A body initially moving with a velocity of \$5\ ms^{-1}\$ attains a velocity of \$25\ ms^{-1}\$ in \$5\ s\$, find the acceleration of body in \$ms^{-2}.\$

Acceleration \$ = \dfrac{\text{Final velocity - initial velocity}}{\text{time taken}}\$Final velocity \$v = 25 m/s \$Initial velocity \$u = 5 m/s \$a \$= \dfrac{25 - 5}{5} m/s^2\$a \$= 4 m/s^2 \$

Q: Which of the following is/are true about acceleration

Acceleration =\$\dfrac{Final\ velocity\ - Initial\ velocity }{time}\$ Its SI unit is =\$ms^{-1}/s=m/s^2\$A negative acceleration acts opposite to the direction of motion of object and it reduces the velocity , it called retardation.

Question 1

The accelerated motion of a body can occur :

Accepted Answer

The accelerated motion of a body can occur :

A

Due to change in its speed only.

B

Due to change in direction of motion only.

C

Due to change in both speed and direction of motion.

D

Due to constancy of velocity.

Easy

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Question 2

Unit for the rate of change of velocity is

Accepted Answer

Velocity units $ = m/s$Acceleration is the rate of change of velocitya $= \dfrac{change \ in \ velocity }{time } $Therefore SI units of acceleration is $ms^{-1}/s = \dfrac{m}{s^2} $

Question 3

A body starts from rest and acquires a velocity $10m s^{-1}$  in 2 s. Find the acceleration.

Accepted Answer

Acceleration = Change in velocity per unit time.Therefore, Acceleration $a = \dfrac{10 m/s}{2 s} = 5 m/s^2 $

Question 4

A car starting from rest acquires a velocity $180\ m s^{-1}$ in 0.05 h. Find the acceleration.

Accepted Answer

Acceleration, $a = \dfrac{180 m/s}{0.05\times 3600 s} = 1 m/s^2 $

Question 5

Unit of acceleration is

Accepted Answer

acceleration  $ = \dfrac{dv}{dt}$Units of 'v' is m/s and 't' is secondsTherefore units of acceleration is $\dfrac{m}{s^2} $

Question 6

A body initially moving with a velocity of $5\ ms^{-1}$ attains a velocity of $25\ ms^{-1}$ in $5\ s$, find the acceleration of body in $ms^{-2}.$

Accepted Answer

Acceleration $ = \dfrac{\text{Final velocity - initial velocity}}{\text{time taken}}$Final velocity $v = 25 m/s $Initial velocity $u = 5 m/s $a $= \dfrac{25 - 5}{5} m/s^2$a $= 4 m/s^2 $

Question 7

The velocity of a body can change

Accepted Answer

Acceleration is defined as change of velocity in unit time. So if acceleration is zero, there is no change of velocity, the body is moving with a constant velocity.

Question 8

Which of the following is/are true about acceleration

Accepted Answer

Acceleration =$\dfrac{Final\ velocity\ - Initial\ velocity }{time}$ Its SI unit is =$ms^{-1}/s=m/s^2$A negative acceleration acts opposite to the direction of motion of object and it reduces the velocity , it called retardation.

Question 9

A block is released from rest at the top of a friction-less inclined plane 16 m long. It reaches the bottom 4 sec later. A second block is projected up the plane from the bottom. At the instant at which the block is released in such a way that it returns to the bottom simultaneously with the first block. The acceleration of each block on the incline is :

Accepted Answer

Acceleration of both the blocks will be the same on the inclined planeLet it be '$a$'So, according the the equation of motion$\frac { 1 }{ 2 } \times a\times { 4 }^{ 2 }=16\Rightarrow a=2m/{ s }^{ 2 }$

Question 10

If the velocity of a body does not change, its acceleration is

Accepted Answer

Acceleration of a body is defined as the rate of change of the velocity of the body. Now since the velocity doesn't change at all, the rate of change will be zero.So, acceleration = 0

Motion In A Straight Line

Physics
33243 Views

The accelerated motion of a body can occur :

Unit for the rate of change of velocity is

A body starts from rest and acquires a velocity $10 m s^{- 1}$ in 2 s. Find the acceleration.

A car starting from rest acquires a velocity $180 m s^{- 1}$ in 0.05 h. Find the acceleration.

Unit of acceleration is

A body initially moving with a velocity of $5 m s^{- 1}$ attains a velocity of $25 m s^{- 1}$ in $5 s$ , find the acceleration of body in $m s^{- 2} .$

The velocity of a body can change

Which of the following is/are true about acceleration

If the velocity of a body does not change, its acceleration is

Motion In A Straight Line

Physics 33243 Views

The accelerated motion of a body can occur :

Unit for the rate of change of velocity is

A body starts from rest and acquires a velocity 10ms−1 in 2 s. Find the acceleration.

A car starting from rest acquires a velocity 180 ms−1 in 0.05 h. Find the acceleration.

Unit of acceleration is

A body initially moving with a velocity of 5 ms−1 attains a velocity of 25 ms−1 in 5 s, find the acceleration of body in ms−2.

The velocity of a body can change

Which of the following is/are true about acceleration

If the velocity of a body does not change, its acceleration is

Physics
33243 Views

A body starts from rest and acquires a velocity $10 m s^{- 1}$ in 2 s. Find the acceleration.

A car starting from rest acquires a velocity $180 m s^{- 1}$ in 0.05 h. Find the acceleration.

A body initially moving with a velocity of $5 m s^{- 1}$ attains a velocity of $25 m s^{- 1}$ in $5 s$ , find the acceleration of body in $m s^{- 2} .$