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give 7 examples of inertia of rest with explanation
How to find the least count of a spring balance?
give examples of inertia of direction with explanation
please give the correct ans from the 4 options
balanced forces ____________ a body
a) move b) accelerate c) retard d) deform
how many types of inertia are there name them
define one newton force
AN OBJECT OF MASS 2KG IS SLIDING WITH A CONSTANT VELOCITY OF 4m/s on a frictionless horizontal table. the force required to keep the object moving with the same velocity is _____________
what is the formula of recoil velocity of a gun?????????
explain why a cricketer moves his hands backwards while catching a fast moving cricket ball.
please explain newton's third law of motion!
if a man jumps out from a boat , the boat moves backwards . why?
What os Static inertia and dynamic inertia?
Derive the equation for the conservation of momentum
1) The minute hand of a clock is 7 cm long. Calculate the distance covered and the displacement of minute hand of the clock from 9.00 AM to 9.30 AM.
2) An athlete completes a round of a circular track of diameter 200 m in 20s. Calculate the distance travelled by the athlete.
3)A boy is running on a straight road. He runs 500 m towards north in 2 minutes 10 seconds and then turns back and runs 200 m in 1 minute. Calculate his average speed and magnitude of average velocity during the whole journey.
4) Akshil drove his car with speed of 20 km/h while going to his college. When he returned to his home along the same route , the speed of the car is 30 km/h. Calculate the average speed of the car during the entire journey.
name and define three different types of inertia and give an example each
Define force and write its si. Unit
From a rifle of mass 4kg, a bullet of mass 50g is fired with an initial velocity of 35 ms-1. Calculate the initial recoil velocity of the rifle.
ALL THE FORMULAS IN THIS CHAPTER FORCE AND LAWS OF MOTION CAN ANY ONE SAY ME ASAP
The bullet of mass 10g moving with a velocity of 400m/s gets embeded in a freely suspended wooden block of mass700g .what is the velocity aquired by a block
examples of newton's second law of motion
What are the effects of the following on inertia of a body?
a) If force is doubled
b) If density is halved
c)If weight is reduced by three times
why are road accidents at high speed are very much worse than accidents at low speed???
A body of mass 5 Kg is moving with a velocity of 10 m/s. A force is applied on it so that in 25 s , it attains a velocity of 35 m/s. calculate the value of the force applied.
on what factors does inertia of a body depend?
a rubber ball of mass 50 g falls from a height of 10 cm and rebounds to a height of 50 cm. determine the change in linear momentum and average force between the ball and the ground , taking time of contact as 0.1 s
What is the real definition of Second Law Of Motion
how does a karate player breaks a slab of ice with a single blow?
Why shockers are provided in automobile vehicles?
An object of mass 2 kg is sliding with a constant velocity of 4 m s–1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
(a) 32 N (b) 0 N (c) 2 (d) 8 N
A gun of mass 500g fires a bullet of mass 10g with a speed of 100m/s.
(a) Initial momentum of ' gun + bullet ' .
(b) Momentum gained by the bullet after firing.
(c) Recoil velocity of the gun
a truck starts from rest and rolls down a hill with a constant acceleration .it travels a distance of 400m in 20s . find the acceleration . find the force acting on it if its mass is 7 metric tonne (1 metric tonne = 1000kg).
Why does the speed of an object change with time?
A Bead Of Mass m is attached to one end of a spring of natural length R And spring constant
K = (√3+1)mg/R . other end of the spring is attached toa point A ON the vertical ring of radius R MAKING AN ANGLE OF 30 DEGREE WITH ITS CIRCUMFERENCE THE NORMAL REACTION AT THE BEAD WHEN THE SPRING IS ALLOWED TO MOVE FROM POINT A
a stone of 1kg is thrown with a velocity of 20m/s. across a frozen surface of a lake and comes to rest after travelling a distance of 50m. what is the force of friction between the stone and the ice.
DO THE UNBALANCED FORCE CAN ALSO CHANGE THE SHAPE OF THE OBJECT ?? IF YES THEN GIVE ONE EXAMPLE !!
a hunter has a machine gun that can fire 50 g bullets with a velocity of 150 m/s . a 60 kg tiger springs at him with a velocity of 10 m/s . how many bullets must the hunter fire per second into the tiger in order to stop him in his track
While doing an experiment to find the relationship between the weight of a rectangular wooden block lying on a horizontal table and the minimum force required to just move it using a spring balance ,it is observed that :
a)more inertia less force
b)less inertia more force
c)more inertia more force
d)no relationship between inertia and force
justify the statement also.
Give reasons : Water drops are removed from from wet clothes by giving light jerk to the cloth.
Why are vehicles fitted with shockers?
a bullet of mass 20g is horizontally fired with a velocity of 150m/s frm a pistol of mass 2kg. What is the recoil velocity of the pistol?
A cart of mass 50 kg is moving on a straight track with a speed of 12m/s. a mass of 10 kg is gently put into the cart . what willl be the velocity of the cart after this?
Find the initial velocity of the car which is stopped in 10 sec by applying brakes .The retardation due to brakes is 2.5m/sec sq.....
Show that Newton's first law of motion is contained in second law ?
A bullet fired from a gun makes a clean whole in a window whereas a stone pebble thrown brakes the whole window.why?
How much momentum will a dumbbell of mass 10 Kg transfer to the floor if it falls from a height of 80 cm? Take its downwards acceleration to be 10 m/s2?
can someone plz tell me the derivations of equations of motions without graph ..
in ncert book of science activity 9.4 is given :
Make 2 chidren stand on 2 different carts and give them 1 sand bag and ask them to play catch - Catch . Do each of them recieve an instantaneous reaction of throwing sandbag (action) ?
why chinaware is wrapped in straw while transportation?
a bullet of mass 10 g is fired from a rifle with a velocity of 800 m/s . after passing through a mud wall 180cm thick, the velocity drops to 100m/s. calculate the average resistance of the wall.
A gunman gets a jerk on firing a bullet.why??
A Boy whose mass is 75 kg holds in his hands a bag weighning 40 N .with what force does the floor push up on his feet.
EXPLAIN WITH FIGURE
action and reaction forces do not balance each other. why?
1.Aporsche 911 accelerates from rest to 27 m/s due north in 5.8 sec.The mass of the car is 1400 kg.what is the magnitude and direction of the average net force that act on the porsche?
Few examples of balanced and unbalanced force?
A stone is dropped from a 100m high tower.how long does it take to fall? 1.the first 50m? and 2.the second 50m.?
why is it difficult to balance our body when we accidentally step on a peel of banana give reasons
The fruits fall off the branches when a strong wind blows. Give reason.
object of mass 1 kg travelling in a straight line with a velocity of
10 m s−1
collides with, and sticks to, a stationary wooden block of mass 5 kg.
Then they both move off together in the same straight line. Calculate
the total momentum just before the impact and just after the impact.
Also, calculate the velocity of the combined object.
object of mass 100 kg is accelerated uniformly from a velocity of 5 m
to 8 m s−1
in 6 s. Calculate the initial and final momentum of the object. Also,
find the magnitude of the force exerted on the object.
Give two examples each when-1) Force changes the speed of a moving body2) Force stops a moving body3) Force changes the direction of motion of a body4) Forces changes the shape and size of a body
how a karate player can break a pile of tiles with a single blow of his hand
A cricket ball of mass 0.4 kg moving with a velocity of 72 m/s is bought to rest by a player . What is the magnitude of the average force exerted by the player ?
if you shake the branches of tree,the fruits fall down. why?
A ball of mass 400g dropped from a height of 5m. A boy on the ground hits the ball vertically upwards with a bat with an force of 100N so that it attains a vertically height of 20m. The time for which the ball remains in contact with the bat? (g = 10m/s2)
Give reasons for the following :
a] A helicopter must have two sets of blades in order to fly with stability.
b) If you are in an elevator and the cable breaks, jumping out just before the elevator hits the ground would not save you.
c)You usually jerk a paper towel from a roll in order to tear it instead of pulling it smoothly.
d) The stronger, heavier team in a tug of war does not create a larger tension in the rope than the weaker, lighter team.
When a carpet is beaten with a stick dust comes out. why?
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