Mass Vs Weight

Mass: Amount of stuff you have. Protons, Neutrons, electrons Measured in Kg, g, Slugs A measure of Inertia Not Zero in space Weight: Force of gravity acting on an object Measured in N, dynes, pounds Zero in the absence of a gravitational field. Demo calculation g = F m g = gravitational Field Strength in N/kg F = Force of gravity in N (AKA weight) m = mass in kg Demo calculation (2x) (g = 9.81 N/kg)

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What is the weight of a 20.3 gram European Swallow? m = 20.3 g =.0203 kg g = F m F = (.0203 kg)(9.81 N/kg) = N.199 N

What is the mass of an object that weighs 582 N on earth? g = F m m = F/g = (582 N)/(9.81 N/kg) = 59.3 kg 59.3 kg

A 62.0 kg person weighs 101 N on the moon. What is the moon’s “g”? g = F m g = F/m = (101 N)/(62.0 N) = 1.63 N/kg 1.63 N/kg

An airtrack glider that weighs 23.1 N experiences a net force of 12.7 N sideways on it. What is its acceleration? (two stepper) g = F m mass of glider: m = F/g = (23.1 N)/(9.81 N/kg) = kg acceleration of glider: F = ma, a = F/m = (12.7 N)/( kg) = 5.39 ms m/s/s weight = 23.1 N 12.7 N