Chapter 6 Exam

Linear Momentum

p; product of mass and velocity; like inertia, it is a resistance to change excepts it incorporates velocity

Linear Momentum equation

p = mv

Linear Momentum units

SI- kgm/s

CGS-gcm/s

BE- slugft/s

Impulse

J, product of force and time

Impulse Equation

J = Ft

Impulse units

SI- Ns

CGS- dyne * s

BE- lb * s

Impulse-Momentum Theorem

J = Δp

Ft = p – p_o
Ft = mv – mv_o

Conservation of Linear Momentum

linear momentum of an isolated system (no external forces) remains constant, p_o = p so m₁v_o1  + m₂v_o2  = m₁v₁  + m₂v₂

Elastic Collision

K_o = K; a collision where there is no net loss in kinetic energy as the result of the collision and momentum is conserved

Inelastic Collision

K_o does not equal K; collision with a loss of kinetic energy but momentum is conserved

Completely Inelastic Collision

objects stick together and move off as one; most K is lost

Collision in Two Dimensions

P_ox = P_x and P_oy = P_y; the components of the vector are conserved

When solving for two variables and one is moving, solve for

the moving variable (usually in m₁v_o1 + m₂v_o2 = m₁v₁ + m₂v₂ equation) and plug that in to the other equation (may be K_o = K equation)