09 - Newton's 2nd & 3rd Laws

# 09 - Newton's 2nd & 3rd Laws - Newton's third law...

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Newton’s third law Reading: 5.6-5.7 Chap 5 homework: 14, 22, 24

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Scale reading = ? 10 N 1.0 kg
Scale reading = ? 10 N 20 N 2.0 kg

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Free body diagram of 1 kg crate: W E,C T S,C (Reading on the scale)
In General • The force that the Earth exerts on an object of mass m is given by W = m (10 N/kg)

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Question: • 10 N/kg is just g • Weight force is given by m g • If Shannon jumps off the physics building in a vacuum, what will her acceleration be? (use Newton’s 2nd law) W E,G m ( 10 N/kg ) = m a W = m ( 10 N/kg ) = m g F net = m a W E,G = m a
2nd Law is the translator M = 5 kg T = 100 N a = 4 m/s/s How big is the friction force? Block W E,B T rope,B = 100 N N floor,B f floor,B = m g = 50 N = 50 N a = 4 m/s/s = 80 N F net = m a In the x-direction: T - f = m a 100 N - f = (5 kg) (4 m/s/s) f = 80 N

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Practice with 2 nd Law: M = 5 kg Sled W E,sled N snow,sled = ?? = m g = 150 N Find all of the forces acting on the sled T x -f =ma x 80 N - 50 N = (15 kg) a x m = 15 kg f snow,sled = 50 N f snow,sled = 50 N
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09 - Newton's 2nd & 3rd Laws - Newton's third law...

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