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N1_presentation

# N1_presentation - vi h vf = The law of conservation of...

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v i v f = ? h The law of conservation of energy can help us calculate the speed of the ball when it reaches the ground, but it cannot tell us the path that the ball follows in getting there.

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The basic rule that relates force to motion is Newton’s 2 nd Law : a m F net = dt v d a = where Note that if the net force is zero, the acceleration of the object is zero – the object moves at constant velocity.
net F represents the vector sum of all the forces acting on the object ... ... 3 2 1 + + + = F F F F net So, in order to determine the net force, we must identify all the contact and long-range forces acting on the object.

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(N1T.5) A spaceship with a mass of 24,000 kg is traveling in a straight line at a constant speed of 320 km/s in deep space. What is the magnitude of the net thrust force acting on the spaceship? (A) 7.7 MN (B) 7.7 GN (C) 75 N (D) 0.075 N (E) 0 (F) Other. Specify: ___________
(N1T.6) Arrows representing four forces having equal magnitudes are shown below. What combination of these forces, acting together on the same object, will allow that object to move with a constant velocity?

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