Do Now: 1. Draw a free body diagram (all the forces) acting on a water skier being pulled by a boat. 2. What is the net force acting on this object?

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Do Now: 1. Draw a free body diagram (all the forces) acting on a water skier being pulled by a boat. 2. What is the net force acting on this object? 4 N 5 N 3 N 1 N 3 N

Principles of Physics - Foederer
Newton’s Laws Principles of Physics - Foederer

Newton’s 2nd Law (N2L) Fnet = net force (N) m = mass (kg)
a = acceleration(m/s2) so F = ma (kg) (m/s2) = Newton

When Fnet = 0, acceleration = 0 The object is in equilibrium
When acceleration = 0 When Fnet ≠ 0, object is accelerating object is either not moving or moving at constant speed -changing speed -changing direction

Equilibrium Examples 1. Determine if the object below is in equilibrium 40 kg 200 N The object is not in equilibrium because Fnet = 200 N 2. Calculate the acceleration of the object Fnet = ma 200N = 40 kg (a) a = 5 m/s2

Equilibrium Examples 1. Determine if the object below is in equilibrium 100 kg 100 N 150 N 250 N The object is in equilibrium because Fnet = 0 2. Calculate the acceleration of the object Fnet = ma 0 = 100 kg (a) a = 0

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