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DIFFERENTIATE BETWEEN SCALAR AND VECTOR QUANTITIES .

5 examples of uniform and Non-uniform motion.??

What is To and Fro Motion? Explain with examples.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?

what are the full forms of v, u, at, s, in chapter 8 motiongive 5 examples of uniform circular motion ?

Please explain the derivation of the equations of motion by graphical method.

^{2}, where v is in m/s andt is in seconds. Its average velocity over the interval from t = 0 to t = 2s:

A. is 0

B. is −2m/s

C. is 2m/s

D. is −4m/s

E. cannot be calculated unless the initial position is given

ans: A

derive the third equation of motion : v

^{2}- u^{2}=2aswhat is the formula for retardationgive 5 examples of uniform acceleration.

An object thrown upwards reaches the highest point in 5s . Find the velocity with which it ws thrown . Also find the displacement ... Pls ans .... 2mrw is ma exam ......

Can a body have zero velocity and still acceleration? give examples,

Please answer by 7:30 pm todayif momentum of a body increases by 20 percent, then percentage increase in its kinetic energy is...

Name the physical quantity represented by the slope of a position time graph and give it,s si unit also.

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 + 1/2at

^{2}A ball is placed at rest at the top of a hill. It travels with constant acceleration for the first 12 second and reaches a speed of 4m/s. It then decelerates at a constant rate of 0.1m/s2 for 20 seconds. It then travels at a constant speed for a further 18 seconds. Draw a speed-time graph for the ball over the course of this 50 seconds.derivation - equation of motion by graphical method

^{3}, where the time t is inseconds. The particle is momentarily at rest at t =

A. 0.75 s

B. 1.3 s

C. 5.3 s

D. 7.3 s

E. 9.3 s

ans: B

Can u give me 9th cbse fa1 sample paper

of 4m/s2. Its average velocity as it goes from x = 2m to x = 8m is:

A. 1m/s

B. 2m/s

C. 3m/s

D. 5m/s

E. 6m/s

ans: E

what are the difference between uniform linear and uniform circular motion? explain with example.

what are the similarities between distance and displacement ?differentiate between distance and displacement

Uniform circular motion is an accelerated motion . JUSTIFY THIS STATEMENT

What is the basic difference between Motion and Rest ?

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?

a body is projected vertically upwards with a velocity 49m/s. a. find maximum height. b.time of ascend. c.time of flight. d.velocity when it is at a height of 60m (g=9.8m/sq.s)

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?

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.

state four differences between distance and displacement

What is the force between two spheres weighing 20 kg each and placed at 50 cm apart?

Difference between uniform and non - uniform motion.

1. positive , positive 2. positive , negative 3. negative , negative 4. negative , positive

A boy tries to hit a bird by throwing stone vertically upward but the stone misses the bird. The stone goes upward in the air for 3s. While returning after 1s the stone hits the bird.

give an example to show that displacement can be negative?

pick the odd one out giving a scientific reason.

displacement , speed , velocity ,momentum

S=ut+1/2at

^{2 }prove by graphical method.^{-1}" in 143 km/ h^{-1 }explain different types of motion with dailylife examples.

example for acceleration against the direction of motion

The Indian High SchoolSummer AssignmentRevision Term 1Grade:9Answer as many as possible:1) State universal law of gravitation. Express it mathematically.2) Differentiate between G and g in tabular form.3) (a) What is acceleration ? Write its unit.(b) Draw velocity-time graph, when an object has (i) uniformly accelerated velocity.(ii) uniformly retarded velocity.4) Prove that if a body is thrown vertically upward, the time of ascent is equal to the time of descent.5) The earth attracts the moon. Does the moon also attract the earth ? If it does, why does the earth not move towards the moon ?6) A bullet of mass 10 g is fired with a velocity of 400 m/s from a gun of mass 4 kg. What is the recoil velocity of the gun ?7) What is weight ? State the direction in which it acts. Write an expression for it. Is the weight of an object same on the earth and the moon ? Why ?8) A circular track has a circumference of 1570 m with AB as one of its diameter. A scooterist moves from A to B along the circular path with a uniform speed of 5 m/s. Find the :(a) distance covered by the scooterist, (b) displacement of the scooterist (Given Π=3.14),(c) time taken by the scooterist in reaching from A to B.9) A man throws a ball of mass 0.5 kg vertically upward with a velocity of 25 m/s. Find : (a) the initial momentum of the ball (b) momentum of the ball at the half way mark of the maximum height (given g=10 m/s2)10) A body thrown in the vertically upward direction rises upto a height hâ€Ÿ and comes back to the position of its start. Calculate (a) the total distance travelled by the body and (b) the displacement of the body.Under what condition will the magnitude of the displacement be equal to the distance travelled by an object ?11) Which is having a higher value of momentum - A bullet of mass 10 g moving with a velocity of 400m/s or a cricket ball of mass 400g thrown with the speed of 90 km/h ?12)Show that weight of an object on the moon is 1/6 of its weight on the earth. [Given : mass of earth = 5.98*1024 kg, mass of moon = 7.36*1022 kg, radius of earth = 6.37*106 m, radius of moon =1.74*106 m]13) A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40,000 N and the track offers a friction force of 5,000 N then calculate : (a) the net accelerating force. (b) the acceleration of the train. (c) the force of the wagon 1 on rest of the wagons.14) A stone is allowed to fall from the top of a tower 100m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 ms-1. Calculate when and where the two stones will meet ? (Take g = 10ms-2)15) The velocitytime graph of a car is given below. The car weighs 1000 kg. (i) What is the distance travelled by the car in the first 2 seconds ? (ii) What is the braking force at the end of 5 seconds to bring the car to a stop within one second ?16) State universal law of gravitation. How the force between the two bodies is affected 2 if the distance between them is tripled ?17) Define acceleration. State a relationship connecting u, v, a and t for an accelerated motion. Give an example of a motion in which acceleration is uniform.18) (a) Name the property by virtue of which a body resists a change in its state of motion. Name the physical quantity which is a measure of this property. (b) Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.19) A man throws a ball of mass 0.5 kg vertically upward with a velocity of 25 m/s. Find : (a) the initial momentum of the ball (b) momentum of the ball at the half way mark of the maximum height (given g=10 m/s2)20) A stone of mass 1 kg is thrown with a velocity 20 m/s across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and ice ?

3 difference between fundamental and derived physical quantities

## 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

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...

Pls explain this question:

Two cars leave with a time gap of 1 minute from the same point. They move with an acceleration of 0.2 m/s2. How long after the departure of the second car, does the distance between them become equal to 3 times its value, when the second car just starts?

give some examples of accelerated motion in everyday life

Under what condition is the magnitude of average velocity of an object equal to it's average speed?

Where on the earth's surface is th weight of a body (1) maximum (2) minimum. give reason.

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 ?

Derive the equation :

^{2}Constant acceleration

Uniformly increasing acceleration

Variable acceleration

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.

what is erratic motion?

Q.4 A man standing on a road has to hold his umbrella at 30$\xb0$ with the verticle to keep the rain away. He throws the umbrella and starts running at 10 km/hr then he finds that rain drops are hitting his head vertically, then speed of rain drops with respect to moving man

(1) 20 km/hr.

(2) 10$\sqrt{3}$ km/hr.

(3) $\frac{10}{\sqrt{3}}$km/hr

(4) 10 km/hr.

Difference between mass and weight

a body can have zero average velocity but not zero average speed . justify

under what circumstances is the velocity of a body negative?

A body covers 4m in 3^{rd}second and 12m in 5^{th}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.

[1] A stone thrown upwards attains a maximum height of 39.2 m. find the velocity which it was thrown

ans. 14 m/s

[2] A ball is thrown upwards with a speed of 19.6 m/s. Calculate [a] the maximum height it reaches , and [b] the time taken in reaching the maximum height [c] time to return its original position

ans. [a] 19.6 m [b] 2 s [c[ 4 s

pls say the method

1. At what distance from Delhi will a train, which leaves Delhi for Amritsar at 2:45 PM at 50km/h, meet a train which leaves Amritsar for Delhi at 1:30 PM at 60 km/h, the distance between the two trains being 510 km?1. At what distance from Delhi will a train, which leaves Delhi for Amritsar at 2:45 PM at 50km/h, meet a train which leaves Amritsar for Delhi at 1:30 PM at 60 km/h, the distance between the two trains being 510 km?

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.

what type of motion uniform or non-uniform is exhibited by a freely falling body? give reasons for your answer

Can the displacement be greater than the distance travelled by an object ?

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

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