Forces 2

3. Newton's Law

3.1 Newton's 1st Law is about object in equilibrium

- Object at rest will stay at rest, or continue to move with constant velocity in a straight line unless it is acted upon by an external force

Forces 1

1. Type of forces

2. FBD, example 1

- Below is a flying jet

- Label all the forces that act on it

- Draw FBD

Momentum & Impulse 2

3.2 Conservation of linear momentum

1. States

• “In an isolated (closed) system, the total momentum of that system is constant.”

OR

• “When the net external force on a system is zero, the total momentum of that system is constant.”, Sp = constant,

OR

•  The total of initial momentum = the total of final momentum

Sp_i = Sp_f

2. In 2-D Þ Sp_ix = Sp_fx
                 Þ Sp_iy = Sp_fy

3. Type of collission

# Use to determine either it's elastic or inelastic collision

Momentum & Impulse 1

3.1 Momentum & impulse

1.     Impulse, J = FDt

2.     Change in momentum: Dp = m (v₂ – v₁)

 3.     Impulse-Momentum Theorem

The impulse of the force F acting on a particle equals the change in the momentum of the particle caused by that force

J = FDt = m(v₂ – v₁)

Basic VS Derived quantities

Basic quantity

SI base unit Base quantity Name Symbol length meter m mass kilogram       kg time second s electric current ampere A thermodynamic temperature       kelvin K amount of substance mole mol luminous intensity candela cd

Derived quantity - Combination of badic quantities

Other Units
velocity	meter per second, m/s
acceleration	meter per second squared,
force	Newton,
pressure	Pascal,
energy	Joule,
power	Watt,

http://physics.nist.gov/cuu/Units/units.html