Question:
Which Newton's law is also known as the Law of Inertia?
Answer:
Newton's First Law of Motion
Force and Laws of Motion
Q 1.
A bullet of mass 10 g travelling horizontally with a velocity of 150 m/s strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block. Also calculate the magnitude of the force exerted by the wooden block on the bullet.
Q 2.
A stone of 1 kg is thrown with a velocity if 20
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 the ice ?
Q 3.
A man pushes a box of mass 50 kg with a force of 80 N.What will be the acceleration of the box ? What would be the acceleration if the mass were halved ?
Q 4.
A force of 5 N gives a mass
an acceleration of 10
,and a mass
,an acceleration of 20
.What acceleration would it give if both the masses were tied together ?
Q 5.
A bullet of mass 50 g is fired from a gun of mass 6 kg with a velocity of 400 m/s.Calculate the recoil velocity of the gun.
Q 6.
What would be the force required to produce an acceleration of 2
in a body of mass 12 kg ? What would be the acceleration if the force were doubled ?
Q 7.
A body of mass 1 kg is kept at rest.A constant force of 6-0 N starts acting on it.Find the time taken by the body to move through a distance of 12 m.
Q 8.
Derive the unit of force using the second law of motion. A force of 5 N produces an acceleration of
on a mass
and an acceleration of 24
on a mass
.What acceleration would the same force provide if both the masses are tied together ?
Q 9.
What is the SI unit of force ?
Q 10.
Do action-reaction forces act on the same body ?
Q 12.
Define momentum of a body.
Q 13.
Derive the relation F = ma,where the symbols have their usual meanings.
Q 14.
State Newton's First Law of motion.
Q 15.
Fill in the blanks :
When a car enters a curved path, the person sitting in it is thrown outwards. This is because of the property of ______________.
Q 16.
Fill in the blanks :
It is dangerous to jump out of a moving bus because due to _________ one falls forward.
Q 17.
Define 1 Newton force.
Q 18.
Which would require a greater force : accelerating a 2 kg mass at 5
or a 4 kg mass at 2
?
Q 19.
A hockey ball of mass 200 g travelling at 10 m/s is struck by a hockey stick so as to return it along its original path with a velocity of 5 m/s.Calculate the change in momentum of the hockey ball by the force applied by the hockey stick.
Q 20.
What is force ? What is inertia ? How is inertia measured ?
Q 21.
Honey and Sunny are two friends.Both are financially well off.Honey is fond of driving an SUV while Sunny enjoys driving Tata Nano.Honey explains to Sunny the risks of driving a light vehicle and Sunny explains to Honey the cost factor.
Read the above passage and answer the following questions :
(i) With whom do you agree,with Honey or with Sunny?
(ii) Explain, why?
(iii) Which values of life do you learn from this discussion?
Q 22.
What are balanced and unbalanced forces?
Q 23.
Are there any limitations to Newton's Laws of motion?
Q 24.
Fill in the blanks :
An umbrella protects us from rain it is based on the property of _____________.
Q 25.
Force can change the shape and size of an object. Give an example.
Q 26.
Why does a bicycle slow down when the cyclist stop pedalling?
Q 27.
What do you mean by a resultant force?
Q 28.
Which principle is involved in the working of a jet plane?
Q 29.
A force of 4 N acts on a body of mass 2 kg for 4 s.Assuming the body to be initially at rest,find (a) its velocity when the force stops acting (b) the distance covered in 10 s after the force starts acting.
Q 30.
Two objects of masses 100 g and 200 g are moving along the same line in the same direction with velocities of 2 m/s and 1 m/s,respectively.They collide and after the collision, the first object moves at a velocity of 1.67 m/s in the same direction.Determine the velocity of the second object
Q 31.
Is force a scalar or a vector ?
Q 32.
What are balanced forces ?
Q 33.
Can balanced forces move a body at rest ?
Q 34.
Is momentum a scalar or vector ?
Q 35.
What is the total momentum of the bullet and the gun on firing ?
Q 36.
Name the various effects of force.
Q 37.
What is one newton force ?
Q 38.
Show that kg-
and N-s represent the same quantity.Which is that quantity ?
Q 39.
Why does a gun recoil on firing ? Obtain an expression for recoil velocity of gun.
Q 41.
Name the categories of forces based on interaction.
Q 42.
Define 1N (Newton).
Q 43.
Is Newton's second law of motion is consistent with the first law? How?
Q 44.
How Newton's Second law of motion is different from First law?
Q 45.
An automobile vehicle has a mass of 1500 kg. What must be the force between the vehicle and road if the vehicle is to be stopped with a negative acceleration of 1.7 ms-2.
Q 46.
When two objects act on each other, does action-reaction force pair cancel out each other?
Q 47.
Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?
Q 48.
Two objects, each of mass 1.5 kg, are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m/s before the collision during which they stick together. What will be the velocity of the combined object after collision?
Q 49.
Fill in the blanks :
When we shake a branch of a mango tree the mangoes fell down, this happens because of ___________.
Q 50.
Fill in the blanks :
When a bus starts suddenly, the bus passengers standing in the bus tend to fall backwards. It is due to _______________.
