1. An object is moving up an inclined plan. Its velocity changes from 15m/s to 10m/s in two seconds. What is its acceleration? (ans. -2.5m/s2)
2. A body covered a distance of x metre along a semicircular path. Calculate the magnitude of displacement of the body, and the ratio of distance to displacement?
3. A particle moving with an initial velocity of 5m/s is subjected to a uniform acceleration of -2.5m/s2. Find the displacement in the next 4 sec. (ans. 0)
4. Acar covers30km at a uniform speed of 30km/hr. what should be its speed for the next 90km if the average speed for the entire journey is 60km/h? (ans. 90km/hr)
5. A person goes to market, makes purchases and comes back at a constant slower speed. Draw displacement -time and velocity time graphs of the person?
6. A boy runs for 10 min. at a uniform speed of 9km/h. At what speed should he run for the next 20 min. so that the average speed comes 12km/hr? (ans.13.5km/h)
7. A particle was at rest from 9 a.m. It moved at a uniform speed 10km/hr from 9.30 a.m. to10 a.m. Find the average speed between (a) 9.00 a.m. and 10.00 a.m., (b) 9.15 a.m. and 10.00 a.m. (ans. 5km/h, 6.67km/h)
8. An insect moves along a circular path of radius 10 cm with constant speed. If it takes 1 min. to move from a point on the path to the diametrically opposite point, find (a) the distance covered, (b) The speed, (c) the displacement, (d) average velocity.
9. A particle with a velocity of 2m/s at t=0 moves along a straight line with a constant acceleration of 0.2m/s2. Find the displacement of the particle in 10s?
10. A particle is pushed along a horizontal surface in such a way that it starts with a velocity of 12m/s. Its velocity decreases at a uniform rate of 0.5m/s2. (a) Find the time it will take to come to rest. (b) Find the distance covered by it before coming to rest?
11. Atrainaccelerated from 20km/hr to 80km/hr in 4 minutes. How much distance does it cover in this period? Assume that the tracks are straight?
12. A cyclist moving on a circular track of radius 50m completes one revolution in 4 minutes. What is his (a) average speed (b) average velocity in one full revolution?
13. Define Scalar quantities and Vector quantities?
14. Define the term “uniform acceleration”. Give one example of a uniformly accelerated motion.
15. Define the term acceleration . Is it a vector quantity or a scalar quantity?
DIFFERENTIATE BETWEEN SCALAR AND VECTOR QUANTITIES .
5 examples of uniform and Non-uniform motion.??
Time (h) 11.00 11.30 12.00 12.30 1.00
Distance 0 30 30 65 100
(km)
Plot the graph.
list 10 scalar and 10 vector quantities related to motion.
1. less than one 2. greater than one 3. equal to one 4. greater than or equal to one
What is the full form of CGS and SI?
Q: An ant climbs up 5 steps each width 20cm and height 20cm. Find the distance covered and displacement?
Answer: Distance covered in each step = 20+20 = 40cm
Total Distance = 40×5 = 200cm
Displacement in each step=
Total Displacement=
give 5 examples of uniform circular motion ?
(a) Draw a graph if x versus t for t=0 and t=5 sec
(b) What is the displacement come out of the particles initially?
(c) What is slope of the graph obtained?
Please explain the derivation of the equations of motion by graphical method.
derive the third equation of motion : v2 - u2 =2as
What is the nature of the displacement versus time graph for non uniform motion ? Give an example.
Please answer
what is the formula for retardation
give 5 examples of uniform acceleration.
It takes 6 minutes for the signal sent by an artificial satellite orbiting around the earth to reach the ground station . Calculate the distance of the artificial satellite from the ground station . The signal travels at a speed of the light that is 3×10 raised to 8 m/s
Can a body have zero velocity and still acceleration? give examples,Please answer by 7:30 pm today
if momentum of a body increases by 20 percent, then percentage increase in its kinetic energy is...
A ball is attached to the end of a horizontal cord is revolved in a circle of radius 2 m at a constant speed of 60rpm. Determine,
a) the magnitude of angular speed after 2 seconds
b) the angular displacement after 1 minute
how to draw the distance - time graph for activity 8.9 and activity 8.10 in page number 106 and 107
Derive the following equations of motion graphically-
1) v = u + at
2) s = ut + 1/2at2
- Calculate the magnitude of displacement of the truck in 15 seconds.
- During which part of the journey was the truck decelerating?
- Calculate the magnitude of average velocity of the truck
derivation - equation of motion by graphical method
Can u give me 9th cbse fa1 sample paper
Q18A body starts from rest and moves with a uniform acceleration of 5m/s2 for 5s and then it moves with a constant velocity for 4s. Later it slows down and comes to rest in 5s. Draw the velocity graph for the motion of the body and answer the following questions:
a. What is the maximum velocity attended by the body?
b. What is the distance travelled during this period of acceleration?
c. What is distance travelled when the body was moving with constant velocity?
d. What is the retardation of the body while slowing down?
e. What is the distance travelled by retarding?
f. What is the total distance travelled?
what are the difference between uniform linear and uniform circular motion? explain with example.
An object moving with initial velocity u along a straight line attains maximum velocity v after travelling distance s. Assume the acceleration is uniform. Derive the relationship between position and velocity of the object by graphical method.
Please answer
differentiate between distance and displacement
Uniform circular motion is an accelerated motion . JUSTIFY THIS STATEMENT
a boy is running on a straight road.he runs 500 m towards north in 2 min 10 seconds and then turns back and runs 200m in 1 minute. calculate his average speed and magnitude of average velocity during first 2 minutes 10 seconds
What is the basic difference between Motion and Rest ?
Q. Rahul white doing skating moves along a number line in the alphabetical order (A, B, C, D, ....., G) and finally stops at 'G'.
(b) Find the average velocity if he covers each meter in 1 s.
A body is moving along a circular path of radius(R). What will be the distance and displacement of the body when it completes half revolution?
IF THE LINEAR SPEED OF MINUTE HAND HAND OF WALL CLOCK IS 3.14 * 10^-4 M/SEC THEN LENGTH OF MINUTE HAND IS
1. 18 CM
2. 1800 CM
3. 3.14 CM
4. 314 CM
ABDUL WHILE DRIVING TO SCHOOL COMPUTES THE AVERAGE SPEED FOR HIS TRIP TO BE 20 KM/HOUR. ON HIS RETURN TRIP ALONG THE SAME ROUTE , THERE IS LESS TRAFFIC AND THE AVERAGE SPEED IS 30 KM/HOUR. WHAT IS THE AVERAGE SPEED FOR ABDUL'S TRIP?
can the equation v = u+at be used for a particle moving with nonuniform acceleration ?
state four differences between distance and displacement
robbers in a car travelling at 20 m/s passes a policeman on a motorcycle at rest. the policeman immediately starts chasing the robbers. the policeman accelerates at 3 m/sq seconds for 12 s and thereafter travels at a constant velocity. Calculate the distance covered by the policeman before he overtakes the car.
Difference between uniform and non - uniform motion.
Name the physical quantity that corresponds to the rate of change velocity????
A boy, standing at pointA, throws a stone, which travels its path uptoBas shown below. At the top of its path, the stone has ____.
give an example to show that displacement can be negative?
a) Define uniform acceleration. What is the acceleration of the body movingwith uniform velocity?b) A particle moves over three quarters of a circle of radius r. What is themagnitude of its displacement?
S=ut+1/2at2 prove by graphical method.
explain different types of motion with dailylife examples.
when a graph of one quantity versus another results in a straight line the quantities are:
a.] both constant
b.] equal
c.] directly proportional
d.]inversely proportional
example for acceleration against the direction of motion
a The slope of distance time graph
b The are under velocity time graph
c The slope of velocity time graph
3 difference between fundamental and derived physical quantities
Urgent
Ask
rest and motion are relative terms. Explain.
1.The numerical ratio of displacement to distance for a moving object is:
a)always less than 1
b)always equal to 1
c)always grater than 1
d)equal to or less than 1
explain too...
a rocket propelled car starts from rest at x = 0 and moves in the positive direction of x with constant acceleration a = 5m/s2 for 8 seconds until the fuel is exhausted. it then continues with constant velocity. what distance does the car cover in 12 seconds?
give some examples of accelerated motion in everyday life
Give one example of the following :
a)positive acceleration
b)negative acceleration
c)uniform acceleration
Under what condition is the magnitude of average velocity of an object equal to it's average speed?
A car moving at a uniform speed covers a distance of 200m in 4 sec calculate (a) speed of car (b)the time it will take to cover 300m (c) the distance it will cover in 5 sec? i need the answer quickly plzzz
(i) Calculate the average speed of the sprinter.
(ii) What is the peak value attained by the sprinter ?
(iii) During which time interval is the acceleration highest ?
(iv) Plot the distance-time graph and velocity -time graph for the race.
(v) Show on the graph the velocity of the sprinter at the end of 5 seconds.
A ball is dropped on the floor from the height of 10m. It rebounds to a height of 2.5m. If the ball is in contact with the floor for 0.01 seconds, what is the average acceleration during contact ?
Ram hired a 3 wheeler from bus stand to his house. The driver A of 3 wheeler followed the shortest path and reached the destination in 1/2 an hour and charged Rs 50 from Ram. On the same day Ram's sister also came her house after attending a function in other city. She also came hired a 3 wheeler the diver B of 3 wheeler took an hour to reach and charged Rs 150 from her.
a) Is the displacement , between Bus stand and Ram house is same in both case?
b) What value are shown by A ?
Derive the equation :
a) what is the distance travelled by the cow?
b) what is the distance travelled by the bird?
c) which one of them has more displacement?
EXPLAIN WHETHER THE WALLS OF A CLASSROOM ARE AT REST OR IN MOTION?
A train starting from rest attains a velocity of 72 km/h in 5 minutes. Assuming that the acceeration is uniform. Find the acceleration and the distance traveed by the train for attaining this velocity.
draw a velocity versus time graph of a stone thrown vertically upwards with a velocity v and then coming downwards after attaining the maximum height.
An aeroplane touches down (land) at a speed of 180km/h stops after covering a runway of 1km. Calculate(a) the retardation(b) the time in which the plane comes to rest.
What is To and Fro Motion? Explain with examples.
Difference between mass and weight
name the terms used to describe the overall motion of an object
a body can have zero average velocity but not zero average speed . justify
An object is dropped from a height of 120m. The acceleration of the object is 10m/s2 downwards. Find the distance travelled by the object after (a)1s (b)2s and (c) 3s. What is the vilocity of the object after 3s?
A body covers 4m in 3rd second and 12m in 5th second. If the motion is uniformly accelerated, how far will it travel in the next 3 seconds?
An electric train is moving with a velocity of 120 km/ hr. How much distance will it move in 30 seconds.
Vikram drove his car for 2 hours at the rate of 60 km per hour and then 3 hours at 50 km per hour.Find the average speed of his journey?
what are the similarities between distance and displacement ?
a)compare a block of wood, water and air on the basis of the following
1 compressibility
2 particle motion
3 rigidity
b)account for the following
1 gassesexert pressure on the walls of the container
2 liquid can be called as fluids
Give two examples of bodies having non-uniform motion
A car starts from rest and accelerates uniformly for 10 s to a velocity of 8 m/s. It then runs at a constant velocity and is finally brought to rest in 64 m with a constant retardation. The total distance covered by the car is 584 m. Find the value of acceleration, retardation and total time taken.
1. positive , positive 2. positive , negative 3. negative , negative 4. negative , positive
what type of motion uniform or non-uniform is exhibited by a freely falling body? give reasons for your answer
Please answer this question.
A car accelerates uniformly from 18 km/h to 36 km/h in 5 seconds.
calculate the -
a)acceleration
b)distance covered by the car
(i) Draw the shape of the v-t graph
(ii) Find the maximum velocity attained and the total distance travelled during this journey.
A body travels 200cm in the 1st 2 s and 220cm in the next 5 s.Calculate the velocity at the end of 7th second from start ? It's answer is 2.22 m/s
A car moving with a certain velocity comes to a halt if the retardation was 5m/s2. Find the initial velocity of the car.