SPLBE 2016 Flashcards
may be defined as any influence with tends to change the motion of an object
force
the four fundamental forces in the universe
- gravity force
- electromagnetic force
- nuclear weak force
- strong force
force which holds nucleus together
strong force
range of strong force in meters
10^-15 (diameter of a maximum sized nucleus)
strength of strong force
1
strength of electromagnetic force
1/137
range of electromagnetic force in meters
infinite
strength of nuclear weak force
10^-0
range of nuclear weak force in meters
10^-18 (0.1% of the diameter of protons)
strength of the force of gravity
6x10^-39
range of the force of gravity in meters
infinite
what is the SI unit of force
newton
1N is equal to
1kgm/s^2
newton’s first law of motion
the law of inertia: states that if the body is at rest, it will remain in motion with constant speed in a straight line unless there is a net force acting upon it
f=0
newton’s first law of motion
the law of inertia: states that if the body is at rest, it will remain in motion with constant speed in a straight line unless there is a net force acting upon it
{f=0}
newton’s second law of motion
law of acceleration: if a net force “F” acting on the body of mass “m” is not zero, the body acceleration “a” is proportional to the force and inversely proportional to the mass of the body
acceleration formula in terms of force
a=f/m
newton’s law of gravitation
states that the force on a spherical object of mass m1 due to the gravitational pull of mass m2 is:
f=Gm1m2/r^2
what is the constant value of gravity
6.67408×10-11Nm2/kg2
is the product of force and the time it acts
impulse
impulse formula
I=Ft
is the product of the mass and the velocity of the body
momentum
momentum formula
P=mv
is equal to the change in momentum
impulse-momentum theorem
impulse-momentum theorem formula
Ft=mv2-mv1
the law of conservation of momentum
when two bodies of masses m1 and m2 collide, the total momentum before impact is equal to the total momentum after impact
equation for the law of conservation of momentum
m1v1+m2v2=m1v1+m2v2
occurs when two or more objects hit each other
collisions
concept of collisions
when objects collide, each object feels a force for a short amount of time. This force for a short amount of time. This force impart an impulse, or changes the momentum of each of the colliding objects. But if the system of particles is isolated, we know that momentum is conserved. Therefore, while the momentum of each individual particle involved in the collision changes, the total momentum of the system remains constant
