TOPIC 3 TOOLKIT
Follow the resultant.
Change each model and connect the force diagram to acceleration, impulse or momentum transfer.
Resultant force model
Take forward as positive. Driving force and resistance act in opposite directions.
RESULTANT3300.00 N
Fdrive − Fresistance
ACCELERATION3.00 m s⁻²
a = ΣF/m
Impulse model
A constant force acting for a time produces an impulse equal to the momentum change.
IMPULSE78.00 N s
FΔt = Δp
VELOCITY CHANGE0.07 m s⁻¹
Δv = impulse/m
Terminal-velocity stages
For a falling object, compare downward weight with upward drag.
MOTION STATEaccelerating downward
Resultant = 500.00 N downward; acceleration = 6.25 m s⁻²
Perfectly inelastic collision
Two objects join. Momentum is conserved; kinetic energy generally is not.
COMMON VELOCITY1.60 m s⁻¹
(m₁u₁ + m₂u₂)/(m₁ + m₂)
KINETIC ENERGY9.60 J lost
16.00 J before; 6.40 J after