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Give two examples of force that compresses.
You are hurt when you kick a stone. Why?
Define the unit Newton.
Name the cgs unit of force.
Give Reasons for the Following:
When a carpet is beaten with a stick, dust comes out, why?
If action is always equal to reaction explain, why a cart pulled by a horse can be moved?
Why is it difficult to balance our body when we accidentally step on the peel of banana?
Why some of the leaves may fall from a tree, if we vigorously shake its branch?
Why is it advised to tie the luggage with a rope on the roof of buses?
Balanced and unbalanced forces.
Mass and inertia
Motion and force of friction.
Force and momentum
First and second law of motion.
Show that the rate of change of momentum is equal to product of mass and acceleration.
State the law of conservation of momentum. Derive it by using Newton’s third law of motion.
When a force of 40 N is applied on a body it moves with an acceleration of 5 m s-2. Calculate the mass of the body.
It is required to increase the velocity of a scooter of mass 80 kg from 5 to 25 m s-1 in 2 second. Calculate the force required.
Two blocks made of different metals identical in shape and size are acted upon by equal forces which cause them to slide on a horizontal surface. The acceleration of the second block is found to be 5 times that of the first. What is the ratio of the mass of the second to first?
An object undergoes an acceleration of 8 m s-2 starting from rest. Find the distance travelled in 1 second.
A body of mass 500 g is at rest on a frictionless surface. Calculate the distance travelled by it in 10 second when acted upon by a force of 10-2 N.
You might have observed that when you walk on ice you take small steps. Why?
Why you have to apply more force in moving a cycle which is punctured?
If someone jumps to the shore from a boat, the boat moves in the opposite direction. Why?
Why fireman finds it difficult to hold a hose, which ejects large amounts of water at a high speed?
Why you tie the luggage with a rope on the roof of buses?
An athlete runs some distance before taking a long jump, because:
While dusting a carpet we suddenly jerk or beat it with a stick because:
A man is at rest in the middle of pond on perfectly smooth ice. He can get himself to the shore by making use of Newton’s :
Inertia is that property of a body by virtue of which the body is:
A force can be completely described by:
The SI unit of force is:
Which of the following has the largest inertia?
The rate of change of momentum is:
A jet engine works on the principle of Newton’s:
Action-reaction forces act:
The acceleration of a body is to be doubled from its initial value. By what factor is the acting force to be increased?
The momentum of a body of given mass is proportional to its:
Newton’s second law of motion gives us a measure of:
When a net force acts on an object the object will be accelerated in the direction of force with an acceleration proportional to:
The action-reaction forces:
A gun recoils after firing to conserve:
The quantitative definition of force is given by:
The qualitative definition of force is given by:
When balanced forces act on a body, the body is:
If a body experiences a net zero unbalanced force, then body:
Write or false for the following statements:
Force may or may not produce any motion in a body.
Action and reaction act on the same body.
Impulse represents the rate of change of momentum of a body.
1 N is that force which produces acceleration of 1 m s-2 in a body of mass 1 g.
In any interaction, there are always at least two forces in play.
The force of friction is smaller in solids than in liquids.
The first law of motion is also known as Galileo’s law of inertia.