CBSE ADDA

CBSE ADDA Q. 1.  When the passenger m oving in a bus , the road side trees appear to b e moving ---------------------------------- (a) Back ward (b)For ward Q. 2.  In uniform motion the object covers ------------ (a) equel distance (b) un equal distance Q. 3.  Where objects cover un equal distances in equal interval of time then the motion is called ---------------- (a) uniform motion (b) non uniform motion Q. 4.  The average speed = =A car accelerate = (a) Total time taken /total distance traveled (b) Total distance traveled/total time taken Q. 5.  v = (a) t/s (b) s/t Q. 6.  An object travels 16m in 4sec and another 16 m in 2 sec. what is the average speed of the object----------- (a) 5.33 ms-1 (b) 5. 34 ms-1 Q. 7.  If we specify , its direction of motion along with its speed , the quantity that specifies with the aspects is called------------- (a) velocity (b) motion Q. 8.  Automobiles are fitted with a device that show the distance traveled . such a device is known ---------- (a)

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CBSE ADDA Q. 1. How much force is needed to accelerate a trolley of mass 20g through 1 m/s2? Q. 2. A force of 100N acts on a mass of 25 kg for 5 s .What velocity does it generate? Q. 3. A bullet leaves a rifle with a velocity of 100m/s and the rifle of mass 2.5 kg recoils with a velocity of 1m/s. Find the mass of the bullet? Q. 4. A certain force acting on a mass of 15kg for 3s, gives it a velocity of 2m/s. Find the magnitude of force? Q. 5. A cricket ball of mass 0.15 kg is moving with a velocity of 1.2m/s . Find the impulse on the ball and average force applied by the player if he is able to stop the ball in 0.18s? Q. 6. A motor car of mass 200kg is moving with a certain velocity . It is brought to rest by the application of brakes, within a distance o f 20m when the average resistance being offered to it is 500N.What was the velocity of the motor car? Q. 7. A body of mass 0.5kg undergoes a change of velocity of 4cm/s in 4s What is the force acting on it? Q. 8. A force of 8N

CBSE ADDA  Numericals On Motion Q.1: An athlete completes one round of circular track of diameter 200 m in 40 sec. What will be the distance covered and the displacement at the end of 2 minutes 20 sec? (  2200 m , 200 m) Q.2: Joseph jogs from one end A to another end B of a straight 300 m road in 2 minutes and 30 sec and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B (b) from A to C? ( 2 ms ‑1 , 1.90 ms -1 , 0.952ms -1  ) Q.3. Abdul while driving to school computes the average speed for his trip to be 20 kmh -1 . On his return trip along the same route, there is less traffic and the average speed is 30 kmh -1 . What is the average speed of Abul’s trip? (24 kmh -1  ) Q.4: A motor boat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 ms -2 for 8.0 s. How far does the boat travel during this time? (96 m.) Q.5: A driver of a car travelling a

CBSE ADDA CBSE Class IX Subject: Physics Topic: Motion Q. 1.When the passenger moving in a bus, the road side trees appear to be moving (a) Back ward (b )Forward Q. 2.In uniform motion the object covers (a) equal distance (b) unequal distance Q. 3.Where objects cover unequal distances in equal interval of time then the motion is called (a) uniform motion (b) non uniform motion Q. 4.v =? (a) t/s (b) s/t Q. 6.An object travels 16m in 4sec and another 16 m in 2 sec. what is the average speed of the object (a) 5.33 ms-1 (b) 5. 34ms-1 Q. 7.If we specify, its direction of motion along with its speed, the quantity that specifies with the aspects is called (a) velocity (b) motion Q. 8.The velocity of an object can be (a) non uniform or variable (b) uniform or variable Q. 9.A car accelerate uniformly from 18 km h-1to 36 km h-1in 5 sec. calculate the acceleration (a) 1ms-2 (b) 1 ms-3 Q. 10.A train starting from rest attains a velocity of 72 km h-1in 5 minutes.

In the physical world, one of the most common phenomena is motion. The branch of Physics, which deals with the behavior of moving objects, is known as mechanics. Mechanics is further divided into two sections namely Kinematics and Dynamics. Kinematics    deals with the study of motion without taking into account the cause of motion.   Dynamics is concerned with the cause of motion, namely force.   ☼ An object is said to be in motion if it changes its position with respect to its surroundings in a given time An object is said to be at rest if it does not change its position with respect to its surroundings. ☼ We have observed that the position of stars and planets change while you remain stationary. In reality the earth is moving too. Thus, an object which appears to be at rest, may actually be in motion. Therefore, motion and rest are relative terms   . There are three types of motion: ☼ Translatory     motion      ☼ Rotatory motion                 ☼ Vibratory motion   Transla

CBSE SCIENCE Question: The distance (S) in metres travelled by a particle is related to time(t) in seconds by the equation of motion S = 5 t2. What is the initial velocity of the particle? nswer:   S = 0 + 5 t2 Initial velocity = 0 [because t is not 0] Question 22 Question: What conclusions do you draw about the nature of motion of the body from the following velocity-time graph? Answer: a) The object is moving with uniform acceleration (since the graph is a straight line. Straight line graph means change in velocity in equal intervals of time) b) The object is having zero acceleration (since the object is moving with uniform velocity) c) The object is moving with negative acceleration or retardation (since the velocity decreases and finally becomes zero) d) The object is moving with variable acceleration (since the change in velocity is not equal) Q uestion: State the type of motion represented by each of the following graphs: Answe

CBSE SCIENCE Question: An object covers a distance of 'S' metres in 't' seconds as follows: Plot a graph, taking 't' on X-axis and 'S' on Y axis. Answer: Q.A car travels a certain distance with a speed of 50 km/h and returns with a speed of 40 km/h. Calculate the average speed for the whole journey. Answer: Let the distance = d km  Total distance travelled by car = 2d  Total time taken    Average speed  = 44.44 km/h. Question: An artificial satellite is moving in a circular orbit of radius nearly 42,250 km. Calculate its linear velocity, if it takes 24 hour to revolve round the earth. Answer:     Linear velocity, v  = 3.07 km/s Question: The given figure shows the position of a body at different times. Calculate (i) the speed of the body as it moves for 0 to 5 s         (ii) 5 to 7 s (iii) 7 to 9 s Answer:     (i) Speed of the body as it moves from 0 to 5 s = Slope of OA  = 0.6 m s - 1 (ii) Speed from 5 to 7 s = Slope of AB