lesson 3 Flashcards
State the effects of force
1)It can change the state of rest or motion of the body it can produce motion.
2)It can change the shape and size of the body
3)increase or decrease momentum of a body
Name the 2 kinds of forces and explain each
Contact force: These forces are forces applied on a body by physical contact
Non contact forces: these forces are forces acting a body without being in contact with them meaning there is a distance between object applying the force and object being acted upon
Name the different contact forces
Different contact forces are: Frictional force, Normal reaction force, Tensional force, force by a spring, force by collision of 2 bodies]
Name the different non contact forces
Different non contact forces are: gravitational force, electrostatic force, magnetic force.
What is frictional force
Force acting in the opposite direction of the applied force by the surface in contact with the body
What is normal reaction force
Force acting on a body normal to the surface on which the body is kept on which is equal to the force applied by a body when kept on a surface.
Tensional force
A force develops in a string when a body is attached to the string which acts opposite to the direction of force applied by the body. this force which pulls the body upwards and balances out the weight of the body is called tensional force
what is restoring power
the capability of a spring to return to its original shape or form when force is removed. this is the force acting opposite to the force acting on the spring its magnitude is directly proportional to the magnitude of displacement
What is force of action
When a body collides 2 forces acts on the bodies, the body which collided with other applies a force called force of action
What is force of reaction
The body when acted upon by force of action applies a opposite force at the same instant this force is called force of reaction
what is gravitational force
In this universe particles attract each other due to their mass, this force of attraction is called gravitational force
what is weight
The force on a body by force of attraction of earth is called force of gravity
What is electrostatic force
like and unlike charges attract each other this force of attraction is called electro static force
What is magnetic force
Like poles and unlike poles attract each other this force of attraction is called magnetic attraction
What is the general character of non contact forces
The magnitude of these forces depend on the distance of seperation between them, if seperation decreases then the magnotude of these forces increases
what did scientist believe before Galelio and what did he prove
Before Galelio people believed that the body remains in state of rest until a force acts on it and it remains in state of motion if there is a force acting on it and if the force is removed then the object doesent stay in motion. Galileo proved that body stays in state of rest if its in state of rest and remains in state of motion if its in state of motion unless a opposite force acts on it.
What does newtons first law state
A body remains in state of rest if its in state of rest and the body remains in state of motion if its in state of motion in the same direction and speed until a external force acts upon the body
what is inertia
Tendency of a body to retain its state of rest or state of motion
What is force
Force is a external cause tends to change state of rest or state of motion
The greater the mass _______ the inertia
Greater
what are the two types of inertia
Inertia of rest: a body remains in state of rest until a external force acts on it
inertia of motion: a body remains in state of motion until a external force acts on it
Give a example of inertia of rest
When a train is in motion and suddenly stops: the feet of people are in contact to the train so when the train stops and upper part of out body which is not in contact remains in state of motion while our lower part of the body which is in contact stops with the train thus due to inertia we jerk forward
hanging carpet being hit with stick causes the dirt to come out: when the carpet is hit there is a change in its state of rest, the carpet changed to state of motion while the dust particle remains in state of rest due to inertia thus the dust particles get removed
Give examples of inertia of motion
When a cyclists stops pedaling the body does not come to a stop the cycle keeps moving until retardation causes it to stop
when a person jumps out of the train lower part of the body comes in contact with the ground and comes to stop while the upper part of the body remains in motion which causes him to fall
what does force to stop a body depend on
When two bodies are in motion the force to stop the body depends on the mass and velocity
What is linear momentum of the body
The linear momentum of a body is its product of mass and velocity
when a force acts on a body change in rate of momentum depends on
It is equal to mass times acceleration in the body due to t he force considering the mass remains same
acceleration in a body is directly proportional to
force applied and mass
What is K in F = Kma
K is a constant its value is so chosen that K is equal to 1 when m= 1 a= 1
What is one newton
One newton is the force when acts on a body of mass 1kg causes a acceleration of 1m/s-2
What is one dyne
one dyne is the force which when acts on a body of 1g produces a acceleration of 1cm/2-3
What is newtons second law of motion
The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied
What is newtons second law of motion
The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied
What is newtons second law of motion
The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied
What is newtons second law of motion
The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied
What is newtons second law of motion
The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied
What is newtons second law of motion
The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied
What is newtons second law of motion
The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied
What is newtons second law of motion
The rate of change of momentum of a body is directly proportional to the force applied on it and the change in momentum takes place in the direction of force applied
what is newtons third law of motion
It states that for every action there is a equal and opposite reaction
the force of attraction depends on
It directly depends on mass of the body and inversely proportional to square of distance between them
What is universal gravitational constant
In the equation F = Gm1m2/r^2 G is constant no matter what the medium is, particle or temperature therefore G is the universal gravitational constant
