Force:
● A push or pull is called force
● The direction in which the body is pushed or pulled is called the direction of force
● It cannot be seen, it can only be judged by its effects. Its effects are :
○ Move a stationary object
○ Stop a moving object
○ Change the speed of a moving object
○ Change the direction of a moving object
○ Change the shape and size of a moving object
● If the force is applied in the direction of motion then the speed increases
● If the force is applied in the direction opposite to the motion then the speed decreases
● A force is an influence which tends to set a stationary object in a motion or stop a moving
object; Or which tends to change the speed and direction of an object; Or which tends to
change the shape and size of an object.
Kinds of Forces
● Balanced Forces
● Unbalanced forces
Balanced Forces
● If the resultant of all the forces acting on a body is zero, the forces are called balanced
forces
● Body doesn't change its position of rest or uniform motion
● It appears as if no force is acting on it
, ● If a Number of balanced forces act on a stationary body the body continues to remain in its
stationary position.
● If a number of balanced forces act on a body in uniform motion, the body continues to be in
its state of uniform motion
● Though balanced forces cannot produce motion in a stationary body or stop a moving body,
they can, however, change the shape of the body
unbalanced Forces
● If the resultant of all the forces acting on a body is non-zero, the forces are called
unbalanced forces
● Body changes its position of rest or uniform motion
● Can move a stationary body or they stop a moving body
● To move a stationary object, we have to push it with a force greater than the opposing force
of friction
● When an unbalanced force acts on a body, it produces motion in the body
● An act of unbalanced force can stop a moving body
Momentum
● The force required to stop a moving bodies directly proportional to its mass
● the force required to stop a moving body is also directly proportional to its velocity
● Because the quantity of motion in a body depends on the mass and velocity of the body
● It is denoted by the letter p
● Momentum is a vector quantity and takes place in the direction of velocity
● Momentum of a body is defined as product of its mass and velocity
○ Ie, momentum = mass*velocity
○ P = m * v
● A push or pull is called force
● The direction in which the body is pushed or pulled is called the direction of force
● It cannot be seen, it can only be judged by its effects. Its effects are :
○ Move a stationary object
○ Stop a moving object
○ Change the speed of a moving object
○ Change the direction of a moving object
○ Change the shape and size of a moving object
● If the force is applied in the direction of motion then the speed increases
● If the force is applied in the direction opposite to the motion then the speed decreases
● A force is an influence which tends to set a stationary object in a motion or stop a moving
object; Or which tends to change the speed and direction of an object; Or which tends to
change the shape and size of an object.
Kinds of Forces
● Balanced Forces
● Unbalanced forces
Balanced Forces
● If the resultant of all the forces acting on a body is zero, the forces are called balanced
forces
● Body doesn't change its position of rest or uniform motion
● It appears as if no force is acting on it
, ● If a Number of balanced forces act on a stationary body the body continues to remain in its
stationary position.
● If a number of balanced forces act on a body in uniform motion, the body continues to be in
its state of uniform motion
● Though balanced forces cannot produce motion in a stationary body or stop a moving body,
they can, however, change the shape of the body
unbalanced Forces
● If the resultant of all the forces acting on a body is non-zero, the forces are called
unbalanced forces
● Body changes its position of rest or uniform motion
● Can move a stationary body or they stop a moving body
● To move a stationary object, we have to push it with a force greater than the opposing force
of friction
● When an unbalanced force acts on a body, it produces motion in the body
● An act of unbalanced force can stop a moving body
Momentum
● The force required to stop a moving bodies directly proportional to its mass
● the force required to stop a moving body is also directly proportional to its velocity
● Because the quantity of motion in a body depends on the mass and velocity of the body
● It is denoted by the letter p
● Momentum is a vector quantity and takes place in the direction of velocity
● Momentum of a body is defined as product of its mass and velocity
○ Ie, momentum = mass*velocity
○ P = m * v
