notes 1 lec 1to 7

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Physical state of a body defined with the help of

velocity

When an object is in equilibrium state then

it's net acceleration must be zero

When an object is at rest

a large number of forces may be acting on it which balance each other

An athlete does not come to rest immediately after crossing the winning line due to the

inertia of motion

Why does the horse rider horse forward when a horse had full gallup stop suddenly

due to inertia of motion

A boy sitting on the top most berth in the compartment of a train which is just point to stop on a railway station drops an apple aiming at the open hand of his brother sitting vertically below his hands at a distance of about 2 m the Apple will fall

slightly away from the hand of his brother in the direction of motion of the train

A force of constant magnitude acts in direction perpendicular to the motion of a particle then its

speed is uniform

Friction force is derived from

electromagnetic force

Which of the following is not fundamental force

friction force

Which of the following is incorrect about normal reaction force

parallel to contact surface

Which of the following is derived force

tension force

which of the following is incorrect about weight force

direction away from the centre of earth

Which of the following is incorrect about tension force

if string is cut having some tension then tension force will not become zero instantaneously

Which of the following is incorrect

if a streched spring spring is cut spring force will become zero instantaneously

Find net force on M2 block if M2 is in rest

Find net force on block of mass m

A block is stationary on a rough incline plane how many forces are acting on the block

A book of mass 5 kg is placed on a table and it is pressed by 10 N force then normal force exerted by table on the book is

59N

3 blocks with masses m,2m,3m are connected by strings as shown in the figure after an upward force F is applied on block m the masses move upward at constant speed v00 what is the net force on the mass of block 2 m

Find contact force(normal) between 8 kg block and ground

130N

T1 ,T2 ,&T3 respectively are

40 ,70 ,150 N

Find contact force on ground by block

If system is in equilibrium then find value of m

8kg

m1=√3m2

Fine for applied by 5kg on 10kg

100N

Fine for applied by 5kg on 4kg

150N

48mg

5kg

Fine tension and angle both

A uniform rope of mass m and length l is fixed at it upper end vertically from a rigid support then the tension in the rope at the distance x from bottom of the rod is

mgx/l

Distance from bottom to A point is 3m

60N

10N

Delete

29.4N

25N

A=m & B =2m respectively

2g upward & g downward

Normal reaction on 12 kg due to ground

20N

Find mass m if system is at rest

20kg

Find mass m system if system is in equilibrium

40kg

Find reading in each spring

25N & 25N

Balance force cannot accelerate the body but balance force can change shape and size of body

true

Direction of force is along

along the direction of change in momentum

-2mu

Magnitude of change in momentum is

√2mu

Calculate change in momentum

Calculate magnitude of change in momentum

2mu

Calculate change in magnitude of momentum

If object is moving with constant velocity then force on it must be zero(in variable mas system)

false

1:3

4√5 N-s

0.4m/s

6.67kg/s

If impulse varies with time t as(kg m/s)=20t²-40t the change in momentum is minimum at

t=1s

A balloon has 2 g air. a small hole is pierced into it the air comes out with a velocity of 4 m/s if the balloons shrinks completely in 2.5 s the average force acting on the balloon is

0.0032N

A bullet of mass 50 g is fired from a gun with initial velocity of 32 m/s if mass of the gun is 4 kg then calculate the recoil velocity of the gun

0.4m/s

15î +4j

Find T1 & T2. in the given diagram

96N,56N

What will be the tension T1 &T2 in the given diagram

36N, 60N

10N

100

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