UNIT.1.LAWS OF MOTION - MATCH THE FOLLOWING

Force	Push or pull
Linear momentum	Mass  x  velocity
Linear momentum	Vector quantity
Linear momentum	p = m v .
Unit of linear momentum	kg m s–1
Newton’s first law	Law of inertia
Force	Vector quantity
Parallel forces are acting in the same direction	Fnet = F1 + F2
Parallel unequal forces are acting in opposite directions	Fnet = F1 – F2 (if F1 > F2) Fnet = F2 – F1 (if F2 > F1)
Parallel equal forces are acting in opposite directions in the same line of action (F1 = F2)	Fnet = F1 – F2 = 0
Example for  Unlike parallel forces	Tug of war
Example for Unbalanced forces	Action of a lever
The force opposite to resultant	Equilibrant
Moment of the force or torque (τ)	τ = F × d.
Moment of the force or torque (τ)	vector quantity
Moment of the force or torque (τ)	SI unit is N m
Moment of a couple	Force × perpendicular distance between the line of action of forces.
Moment of a couple	M = F × S
Moment of a couple	Unit of moment of a couple is newton metre (N m) in SI system.
Newton’s second law	Law of forces
Force	Mass x acceleration
Force	m x a
Unit of Force	Newton or kilogram weight
1 N equal to	1 kg m s–2   (or)  105 dyne
Impulsive force	J = F × t
Unit of Impulsive force	kg m s–1 or N s
Principles involved in Rocket propulsion	Newton’s 3rd law  & Law of conservation of linear momentum.
Newton’s universal law of  gravitation	F=Gm1m2 / r2
G- universal gravitational constant value	6.674 × 10–11     N m2 kg–2.
Acceleration due to gravity of the Earth(g)	unit is m s–2
Mean value of Acceleration due to gravity of the Earth(g)	9.8 m s–2
Relation between g and G	g = GM / R2
Mass of the Earth (M)	M = g R2/G
Mass of the Earth (M)	5.972 × 1024 kg
Mass	Quantity of matter contained in the body
Mass	SI unit is kilogram (kg).
Mass	Scalar quantity
Mass	Measured by physical balance
Mass	Constant everywhere
Weight	Gravitational force exerted on an object
Weight	SI unit of weight is newton (N)
Weight	Measured by spring balance
Weight	Variable everywhere
Lift is moving upward with an acceleration 'a’	Apparent weight is greater than the actual weight.
Lift is moving downward with an acceleration 'a'	Apparent weight is lesser than the actual weight.
Lift is at rest.	Apparent weight is equal to the actual weight.
Lift is falling down freely.	Apparent weight is equal to zero.
Newton’s I law	Stable equilibrium of a body.
Newton’s II law	Law of force
Newton’s III law	Flying nature of bird
Law of conservation of Linear momentum	propulsion of a rocket.