Acceleration

Q.

A train starting from a railway station and moving with uniform acceleration attains a speed of $40km{h}^{-1}$ in $10minutes$. Find its acceleration in the units of $m{s}^{-2}$.

Q.

A car increases its speed from 20km/h to 50 km/h in 10s. Its acceleration is :

1. 30 m/s²

2. 3 m/s²

3. 18 m/s²

4. none of these

Q.

A bullet emerges from a barrel of length $1.2m$ with a speed of $640m/s$ . Assuming constant acceleration, the approximate time that spends in the barrel after the gun fired is

1. $4ms$

2. $40ms$

3. $400\mu s$

4. $1s$

Q. Negative acceleration is also known as ___.

1. retardation
2. deceleration
3. gravity
4. none of these

Q. If a body is moving with a constant velocity, its acceleration is ……………… .

1. can not be determined
2. Positive
3. Zero
4. negative

Q.

Acceleration is a ________ quantity

Q. A train is moving with a speed of $60m{s}^{-1}$. On applying the brakes, it comes to rest in $20s$. What is the magnitude of average acceleration (deceleration) of the train?

1. $5m{s}^{-2}$
2. $2m{s}^{-2}$
3. $3m{s}^{-2}$
4. $4m{s}^{-2}$

Q.

What happens to the acceleration of a body if the body comes to rest?

Q. If a body starts from rest and attains the velocity 40 m/s in 5 seconds, then the acceleration of the body is

1. 2 $m/s^2$
2. 4 $m/s^2$
3. 8 $m/s^2$
4. 12 $m/s^2$

Q. Rate of change of acceleration is known as

1. displacement
2. velocity
3. jerk

Q.

A metro train starts from a station and under uniform acceleration, it acquires a velocity of $72km/h$ in $10$ seconds. Calculate its acceleration and the distance covered during this time.

Q.

What is the retardation

Q.

A particle moves with constant acceleration along a straight line starting from rest. The percentage increase in its displacement during the $4th$ second compared to that in the $3rd$ is

1. $33\%$

2. $40\%$

3. $66\%$

4. $77\%$

Q.

A body moving with uniform acceleration travels 24 m in the 6th second and 44 m in the 11th second.Find the

(a) Acceleration .

(b) Initial velocity of the body .

Q. A train is moving with a speed of $40m{s}^{-1}$. On applying brake, it comes to rest at 20 s, then the acceleration of the train is

1. $-2m{s}^{-2}$
2. $4m{s}^{-2}$
3. $-5m{s}^{-2}$
4. $3m{s}^{-2}$

Q.

Write short notes on acceleration and deceleration. Give examples.

Q. A body is travelling in a circle of radius $10\text{cm}$ as shown. Which of the following statements are true when the body reaches $\text{N}$ from $\text{M}$ along the circumference of the circle in $1\text{min}$?

1. The average velocity of the body $=\frac{1}{3\sqrt{2}}\text{cm}{\text{s}}^{-1}$
2. The displacement of the body $=10\sqrt{2}\text{cm}$
3. The average speed of the body $=\frac{\pi }{12}\text{cm}{\text{s}}^{-1}$
4. The distance covered by the body $=5\pi \text{cm}$

Q.

A heavy truck moves at $36km/h$. It increases its velocity to $90km/h$ in $0.1\text{minute}$.

What is the acceleration of the truck?

1. $6.0m/s^2$

2. $5.5m/s^2$

3. $3.0m/s^2$

4. $2.5m/s^2$

Q.

Uniform speed is a vector quantity.

1. True
2. False

Q.

SI unit of acceleration is:

1. $m{s}^{-2}$

2. m

3. kmph

4. $m{s}^{-1}$

Q.

An iron ball and a wooden ball of same radius are released from a height ‘h’ in vacuum. Which of the two balls would take more time to reach the ground ?

1. Iron ball

2. Both would take same time

3. Wooden ball

4. None of these

Q.

How will you decide whether a body is in uniform acceleration or non-uniform acceleration?
[2 Marks]

Q. When a golfer hits a ball from the tee, the ball is in contact with the club for $0.0005s$. If the ball leaves the tee at a speed of $70m/s$, what was the acceleration of the ball?

1. $700000m/s^2$
2. $140000m/s^2$
3. $150000m/s^2$
4. $500000m/s^2$

Q. The rate of change of displacement is called as velocity rate of change of velocity is acceleration what's the meaning of rate of change

Q. A man goes for a trip in his car and returns after four hours. What is the average speed and average velocity of the car during this period?

Q. Identify the graph type:

1. It is a uniform motion graph
   
2. It is a non uniform motion graph
3. The graph represents straight line motion.
4. The graph is invalid

Q.

A block is sliding down on an inclined plane. The velocity changes at a constant rate from $10cm{s}^{-1}$ to $15cm{s}^{-1}$ in $2$ seconds. What is its acceleration?

1. $2.5cm{s}^{-2}$

2. $1.5cm{s}^{-2}$

3. $4.5cm{s}^{-2}$

4. $1.25cm{s}^{-2}$

Q.

What three things cause acceleration?

Q. The hog rider in the game "Clash of Clans" at his maximum speed can cover $24m$ sized square tiles in $5s$. And to attain his maximum speed, he takes $6s.$ What is the magnitude of his acceleration?

1. $6.2m/s^2$
2. $7.8m/s^2$
3. $4.0m/s^2$
4. $0.8m/s^2$

Q. The distance travelled by an object in a specified direction is.............

1. Speed
2. Displacement
3. Velocity
4. Acceleration