Impulse and Momentum. Momentum Momentum is inertia in motion.

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Presentation transcript:

Impulse and Momentum

Momentum Momentum is inertia in motion

Example 1 The first manmade satellite, Sputnik I, had a mass of 83.6 kg and a momentum of 6.63 X 10 5 kg m/s. What was the satellites speed?

Impulse When objects collide they experience a change in velocity which causes a change in the objects momentum. A change is momentum is known as Impulse A change in velocity is the result of acceleration which affects force so Impulse is also related to force

Example 2 A 75 kg man is involved in a car accident. He was initially traveling at 65 km/hr when he hit a large truck. (a) If he had no air bag in his car and he came to rest against the steering wheel in 0.05 s, determine how much force was exerted on his body (b) If he did have an airbag that inflated and deflated correctly, bringing him to rest over a time of 0.78 s, determine how much force was exerted on his body.

Example 3 A kg hockey puck is traveling at 12 m/s when it is struck by a stick. As a result, the puck travels at 15 m/s in the opposite direction. If the contact between the stick and puck lasted 0.05 s, what was the force?

Example 4 A varying force is exerted on an object of mass 2 kg that is initially at rest as shown in the graph below. What is the impulse during the 1 st 20 sec? What is the velocity at t = 20 sec? What is the average force exerted over the 20 sec? What is the impulse imparted to the object over the whole time?