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QQ: What is the upward acceleration
of a helicopter with a mass of 5000 kg if a force of 10,000 N acts upon it in an upward direction? 2. An automobile with a mass of 1200 kg accelerates at a rate of 3.0 m/s2 in the forward direction. What is the net force acting on the automobile? 3. A 60.0 kg person walks from the ground to the top of a 74.8 m tall building. Calculate her potential energy.
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Today’s Objective: I can describe motion using Newton’s Law’s of Motion.
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What is the big concept Newton described in his first law of motion?
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Hyperlink myhbusters
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What is the big concept Newton described in his second law of motion?
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Aldo is lucky enough to be the first astronaut from MHS
Aldo is lucky enough to be the first astronaut from MHS. On earth he has a mass of 88 kg and weighs 863 N. On the moon he weighed 141 N. The acceleration due to gravity on Mars is 3.7 m/s2. How much does he weigh on Mars?
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And finally…. Newton’s 3rd Law of Motions
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Newton’s Third Law of Motion
Whenever an object exerts a force on a second one, that object exerts an equal and opposite force back. Newton’s Third Law of Motion
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When Action – Reaction forces
do not cancel This means movement can and does occur
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Movement occurs in direction
of greatest vector All forces are equal no movement
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Net Force: (Newton’s 3rd law) Uses vector addition to predict a body’s motion Vectors are equal so no movement Unequal vectors show movement of object
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Reaction Pairs: the opposing forces always come in pairs
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Vector Momentum: mass in action Amount of force it would
take to stop a moving object Vector
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Momentum = Mass x Velocity
p = mv p = Momentum m = mass V = velocity
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Ivonne loves her motorcycle
Ivonne loves her motorcycle. Its mass is 325 kg and she is riding along 140 km/h, south. Find its momentum.
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Conservation of Momentum
Law of Conservation of Momentum The total momentum of 2 objects is equal before and after a collision.
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The total momentum of 2 objects is equal before and after a collision.
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6600 6600 800kg * 2 m/s = 1600 kgm/s 1000kg * 5 m/s = 5000 kgm/s 800kg
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Newton's Cradle
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NHL Physics?
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Coming up Friday!!!!!! Unit Test over: Motion and Newton’s Laws
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