Write the SI unit of the both distance and displacement

State whether displacement is a scalar or a vector quantity.

What is the displacement of a satellite when it makes a complete round along its circular path?

In which one of the following cases will the distance covered and the magnitude of the displacement are not the same? Justify.

(i) A passenger in a train travels from Delhi to Kolkata.

(ii) A raindrop falling in still air.

(iii) An athlete completes one lap in a race.

After studying the motion of a ball rolling on a straight line as shown in the figure.

Find its distance and displacement covered.

(i) when it rolls from P to Q and then to R (i.e., P to Q to R)

(ii) Finally comes back to P (i.e., P to P)(take, P as reference point).

Define average speed, write any one point of difference between average speed and average velocity.

The maximum speed of a train is 80 km/h. It takes 10 h to cover a distance of 400 km. Find the ratio of its maximum speed to its average speed.

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

(i) Give two factors on which acceleration depends.

(ii)Mention the formula and SI unit of acceleration.

Fill in the blanks.

(i) ………..is the term used for negative acceleration.

(ii) A bus starting from rest attains a velocity of 54 km/h in 60 s, its acceleration is …………….. .

If the distance-time graph of a particle is parallel to time axis, then how much is the velocity of the particle?

In the figure below is shown the time-distance graph of cyclist.

Find out from the graph average speed in the whole journey.

Give one similarity and one dissimilarity between the two graphs:

What is the value of acceleration in the following graph:

Given figures represent the motion of two objects P and Q. Which of the objects has positive acceleration and which one has negative acceleration?

Velocity-time graphs of two objects P and Q are as given below:

(i) Which object starts from rest?

(ii)Which object has more velocity after 5 s?

A body is moving with a velocity of 10 m/s. If it starts acceleration with the rate of 2.5 m/s². Find out its velocity after 10s.

If a car travels 50 m distance in 4s with a acceleration of 5 m/s², then what was its initial speed?

A cyclist is moving with a speed of 14 m/s. He starts accelerating with a rate of 6 m/s² and acquired the speed of 18 m/s. Calculate, what distance did he move in acquiring that speed?

A bus is moving with a speed 72 km/h can be stopped by brakes after at least 10 m. What will be the minimum stopping distance, if the same bus is moving at a speed of 144 km/h?

What do you understand by a uniform circular motion?

If the acceleration of the particle is constant in magnitude but not in direction, then what type of path does the particle follow?

What does the path of an object look like when it is in uniform motion?

The velocity of a body increases by 10 m/s in every one second. What physical quantity does the body represent and what is its magnitude?

Area under the velocity-time graph line is 40 m. What physical quantity does this area represent?

Does the motion of second’s hand of a watch represent uniform velocity or uniform speed?

A cyclist travels a distance of 4 km from P to Q and then moves a distance of 3 km at right angle to PQ. Find his resultant displacement graphically.

Draw a diagram to show the motion of a body whose speed remains constant but the velocity changes continuously.

A car is moving on a straight road with a uniform acceleration. The following table gives the speed of the car at various instants of time.

(i) Draw the shape of speed-time graph representing the above sets of observations.

(ii)Find the acceleration of the car.

How can you calculate the following?

(i) Speed from distance-time graph?

(ii) Acceleration from velocity-time graph.

(iii) Displacement from velocity-time graph.

How will you show that the slope of the displacement-time graph gives the velocity of the body?

Given below is the velocity-time graph for the motion of the car. What does the nature of the graph show? Also, find the acceleration of the car.

(i) If the velocity-time graph of an object is parallel to X-axis, then what does it mean? Can it be parallel to Y-axis?

(ii) What type of motion is represented by each one of the following graphs?

(iii) A bus increases its speed from 36 km/h to 54 km/h in 10 s. Find its acceleration.

Study the velocity-time graph and calculate.

(i) the acceleration from A to B.

(ii) the acceleration from B to C.

(iii) the distance covered in the region ABE.

(iv) the average velocity from C to D.

(v) the distance covered in the region BCFE.

Plot velocity-time graph of a body.

(i) moving with a uniform retardation.

(ii) moving with a variable acceleration.

A body starts to slide over a horizontal surface with an initial velocity of 0.5 m/s. Due to friction, its velocity decreases at the rate 0.105 m/s². How much time will it take for the body to stop?

Look at the figure below and answer the following questions:

(i) Name the kind of motion of the stone.

(ii) It this an example of accelerated motion? Why?

(iii)Name the force that keeps the stone in its path.

(iv) What is the direction of this force? Draw it in your answer sheet.

The figure shows an x-t graph of a particle moving along a straight line. What is the sign of the acceleration during the intervals OA, AB, BC, and CD?

Write three equations of uniformly accelerated motion. Also, state the symbols used.

An object starting from rest travels 20 m in the first 2s and 160 m in next 4s. What will be the velocity after 7s from the start?

Obtain a relation for the distance travelled by an object moving with a uniform acceleration in the interval between 4^th and 5^th second.

Manan and Sharman went to Agra through Yamuna-Expressway. Manan started the car and accelerated, so highly that the car was running at 180 km/h within the 20s. Sharma stopped him from doing so and told him that over speeding on road was a straight invitation to life staking situation. Though Manan wanted the adventure of speeding but he was convinced by Sharman.

(i) Why do you think it is dangerous to drive fast on road?

(ii) Which values of Sharman are worth appreciating?

(iii) Find Manan’s speed in m/s.

(iv) What is the acceleration of car?

(v) What would you suggest to Manan, if you were in that car?

Manoj was travelling by Metro train while Rajnish was travelling by his car towards the same destination. Manoj was surprised to reach much before Rajnish and said, since his motion was uniform, he could reach on time. However, Rajnish said that Manoj’s motion was also not uniform.

(i) Who gave a correct explanation of types of motion?

(ii) How did Manoj reach early?

(iii) Give the characteristic values of Manoj.

Neha and Priya went to market. There was no parking space left. Neha parked the car on road side and came out. Priya, however, was very concerned about traffic rules and said that the car should not be standing in ‘Tow Away Zone’. She made Neha drive to the next parking slot which was a little for from the market area.

(i) Compare and contrast the values of Neha and Priya.

(ii) What type of motion is exhibited by a car moving in the market area?

(iii) Represent a car parked in a parking area graphically on a distance-time graph.

A 100 m sprinter increases her speed from rest uniformly at the rate of 1 m/s² upto 40 m and covers the remaining distance with a uniform speed. The sprinter covers the first half of the run in t₁s and second half in t₂s, then

Particles P and Q are undergoing uniform horizontal circular motions along concentric circles of different radii in clockwise sense P completes each round in 2 min while Q does it is 5 min time required by Q to make one revolution around P is

You are sitting in a stationary car. There is a helium balloon tied to its floor. You accelerate and obviously feel like you are being pushed backwards (against the direction of your accelerations). The balloon.

A boy begins to walk eastward along a street in front of his house and the graph of his position from have is shown in the following figure. His average speed for whole time interval in equal to

A bus is travelling the first one-third distance at a speed of 10 km/h, the next one-fourth at 20 km/h and the remaining at 40 km/h. What is the average speed of the bus?

A car A is travelling on a straight level road with a uniform speed of 60 km/h. It is followed by another car B. Which is moving with a speed of 70 km/h. When the distance between them is 2.5 km, the car B is given a deceleration of 20 km/h². After how much time will B catch up with A?

A sprinter has to cover a total run of 100 m. She increases her speed from rest under a uniform acceleration of 1.0 m/s² up to three quarters of the total run and covers the last quarter him uniform speed. The time she takes to cover the first half, and to cover the second half of the run will be

A bus begin to move with an acceleration of 1 m/s². A man who is 48 m behind the bus starts running at 10 m/s to catch the bus. The man will be able to catch the bus after.

Which graph represents a state of rest for an object?