KIN 3514 - linear kinetics

what is kinetics?

study of forces that inhibit, cause, facilitate, or modify motion of a body; Deals with the Causes of Motion & their effects on the motion of objects

what are the units used for mass?

kg

what are the units used for weight?

N

what are the units used for volume?

m³ (cubic meter or liter)

what are the units used for density?

kg/m³

what’s the formula for density?

density = mass/volume

what is concentrated force?

a force at a single point

what is distributed force?

a force that is applied over a distributed area; if an object experiencing a force is deformable, the force may be distributed throughout the object

true or false: The amount of force is highly dependent on the area of contact with the surface.

true

what are the units of stress?

N/m² or Pa

what is stress?

vector; Defined as the internal resistive force to the deformation per unit area

what is the unit for pressure?

N/m² or Pa

what is pressure?

scalar; Defined as the compressive force per unit area that is exerted on a surface

what is the principle of conservation of linear momentum?

when two objects collide and no other external forces act on them, total momentum of the system remains constant; Specifically, total momentum before collision = total momentum after collision

what is the formula for elastic collision?

what is kinetic energy?

energy (potential to perform work) associated with motion

what is the formula for kinetic energy?

KE= ½ mv²

what is elastic collision?

Total momentum & (kinetic) energy of the system are conserved (in a perfect scenario); two object bounce off each other

what’s inelastic collision?

Momentum is conserved, but kinetic energy is not; In some cases two separate objects collide and then combine and move together as a single mass

what is the formula for inelastic collision?

m₁v₁ + m₂v₂ = (m₁ + m₂) 𝑣_{𝑓𝑖𝑛𝑎𝑙}

what is coefficient of restitution?

proportion of total energy that remains with the colliding objects after the collision

what are the coefficient restitution formulas?

C_R = (V_b*V_a)/(U_a*U_b); C_R = V/U