Chapter 6 Forces and Motion Section 3 Momentum.

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Presentation transcript:

Chapter 6 Forces and Motion Section 3 Momentum

Essential Questions for 6-3 How is the momentum of a moving object calculated? How would you explain the law of conservation of momentum?

Momentum Dependent on the objects mass and velocity More momentum = harder to stop or change direction of the object Momentum (p) = mass in kilograms times velocity in m/s. p = m x v Momentum must have a direction, like velocity

Law of Conservation of Momentum When objects collide, the total amount of momentum stays the same Momentum before collision always = momentum after collision This is called a transfer of momentum Sometimes it is split between the objects Sometimes one object stops and transfers all momentum to the object that was struck

Discussion Use Newton’s third law to explain how a person hammering a nail into a block of wood is demonstrating conservation of momentum.

Problem A 0.151 kg baseball is pitched with a velocity of 43.1 m/s. Ignoring air resistance, what is the baseball’s momentum after being pitched? Show your work. END

Quiz 6-3: 2 Questions 1. When a train increases its velocity, its momentum a. decreases. b. remains unchanged. c. increases. d. is transferred to it surroundings.

2. The law of conservation of momentum states that when two objects collide, their combined momentum a. increases after the collision. b. remains the same after the collision. c. decreases after the collision. d. cannot be determined after the collision.