Velocity(Speed with Direction)

Q.

Distinguish between speed and velocity.

Q. What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?
[2 Marks]

Q.

What is average speed and average velocity?

Q.

What is the difference between uniform velocity and non-uniform velocity?

Q.

An object covers half the distance with the speed of 20m/s and other half with the speed of 30m/s . Find average speed?

Q.

A car moving on a straight path covers a distance of 1 km due east in 100 s.What is (i) the speed and (ii) the velocity, of car ?

Q. The position of an object moving along $x-$axis is given by $x=a+b{t}^2$, where $a=8.5\text{m}$ and $b=2.5{\text{ms}}^{–2}$ and $t$ is measured in seconds. What is average velocity between $t=2\text{s}$ and $t=4\text{s}$?

1. $10\text{m/s}$
2. $15\text{m/s}$
3. $12\text{m/s}$
4. $7.5\text{m/s}$

Q.

Which of the two can be zero under certain conditions: average speed or average velocity of a moving body?

Q. Mike is driving his car with an initial velocity of 6 ms${}^{-1}$ and constant acceleration of 3 ms${}^{-2}$. Calculate his displacement after 3 seconds.

Q. What is aerial velocity and what is its unit

Q.

Can velocity be negative.

Q.

Give one example of a situation in which a body has a certain average speed but its average velocity is zero.

Q.

What name is given to the speed in a specified direction?

Q.

When the speed is constant the velocity may not be constant but when the velocity is constant the speed must be constant.why this happens?

Q. Mike is driving his car with an initial velocity of ‘u’ ms${}^{-1}$ and constant acceleration of ‘a’ ms${}^{-2}$. Can we calculate his displacement after some time?

Q.

An ant moving in a straight line is shown below. Its position is indicated at different time instants. Plot its distance with respect to time on a graph taking its initial position as reference point.

Q.

When is a body said to have uniform velocity?

Q.

Give SI unit of speed and velocity.

Q.

What is variable velocity?

Q. If a body covers first half of its journey with uniform speed V1 and the second half of the journey with uniform speed V2 then the average speed is

Q.

A 120m long train is moving towards west at a speed of 10m/s. A small bird flying towards east with a speed of 5m/s crosses the train. Find the time taken by the bird to cross the train in second???

Q.

Which of the quantity speed or velocity gives the direction of motion of body ?

Q.

Give one example of each type of the following motion:

(a) uniform velocity (b) variable velocity

(c) variable acceleration (d) uniform retardation

Q.

Is it possible to have a constant speed, yet a non-zero acceleration? Is it possible to have constant acceleration and varying speed?

Q.

The velocity-time graph of an object moving in a fixed direction is shown in the figure below. What do you conclude about the object?

1. Moves with varying speeds.

2. Is at rest.

3. Moves with a constant speed.

4. Moves with a non zero acceleration.

Q.

Which of the following statement is correct regarding velocity and speed of a moving body ?

(a) velocity of a moving body is always higher than its speed

(b) speed of a moving body is always higher than its velocity

(c) speed of a moving body is its velocity in a given direction

(d) velocity of a moving body is its speed in a given direction

Q.

What are all difference between motion and speed

Q. A car travels a distance of $200\text{km}$ along a straight road at a speed of $40\text{km/h}$. The car returns back to same location with a speed of $60\text{km/h}$. Find the average speed and the average velocity of the car for the entire journey.

1. Average speed $=48\text{km/h},$ Average velocity $=0\text{km/h}$
2. Average speed $=24\text{km/h},$ Average velocity $=12\text{km/h}$
3. Average speed $=48\text{km/h},$ Average velocity $=48\text{km/h}$
4. Average speed $=24\text{km/h},$ Average velocity $=24\text{km/h}$

Q. A car travelling at a speed of 30km/h is brought to rest in a distance of 8m by applyingbbrakes. if the same car is moving ay a speed of 60km/h then it can be brought to rest with same brakes in

Q.

The distance between two points A and B is 100 m. A person moves from A to B with a speed of $20m{s}^{-1}$ and comes back from B to A with a speed of $25m{s}^{-1}$.
Calculate the average speed and the average velocity of the person. [2 MARKS]