3.1.1 Impulse and Momentum

3.1.1 Impulse and Momentum

Marrying Kinematics and Dynamics

​momentum:  property of MOVING  objects

Depends on MASS and VELOCITY

–vector : same direction as VELOCITY

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Multiple Choice

•What is the momentum of a 2000 kilogram car moving east with a speed of 5.0 meters per second?

• 98,100 kgm/s

• 400 kgm/s

• 10,000 kgm/s

• 3924 kgm/s

Multiple Choice

Which has more momentum?

• The bus, it's larger

• The car, it's faster

• Neither, they have the same momentum

Multiple Choice

Which mas more momentum?

• The player

• The ref

• Neither

​•impulse:  A CHANGE IN MOMENTUM

–Caused by a change in VELOCITY

–vector : same direction as NET FORCE

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​Soft Hands

​–http://www.youtube.com/watch?v=AqojIuOdJ3k

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​Start @ 1:54

Multiple Choice

•An air bag is used to safely decrease the momentum of a driver in a car accident. The air bag reduces the magnitude of the force acting on the driver by

• Increasing the length of time the force acts on the driver

• Decreasing the distance over which the force acts on the driver

• Increasing the rate of acceleration of the driver

• Decreasing the mass of the driver

Multiple Choice

•A 1000 kilogram drag racing car accelerates from 0 to  330 miles per hour (148 meters per second) in 5.0 seconds.

–What is the impulse experienced by the drag racer?

• 29,600 kgm/s

• 740,000 kgm/s

• 740 kgm/s

• 148,000 kgm/s

Multiple Choice

•A 1000 kilogram drag racing car accelerates from 0 to  330 miles per hour (148 meters per second) in 5.0 seconds.

–What is the net force experienced by the drag racer?

• 29,600 N

• 1000 N

• 740,000 N

• 3017 N

Multiple Choice

•An F-4 aircraft with a mass of 2.7E4 kilograms lands while moving at 100 meters per second.  The aircraft deploys a parachute that slows the aircraft to a speed of 40 meters per second in 8.0 seconds.

–What force does the parachute exert on the F-4?

• 202,500 N

• 337,500 N

• 135,000 N

• 472,500 N

Multiple Choice

•A 5.00 kg block slides along a horizontal, frictionless surface at 10.0 m/s for 4.00s. The magnitude of the block’s momentum is

• 200 kgm/s

• 50.0 kgm/s

• 20.0 kgm/s

• 12.5 kgm/s

Multiple Choice

•A 3.0kg object is acted upon by an impulse having a magnitude of 15 N•s. What is the magnitude of the object’s change in momentum due to this impulse?

• 5.0 kgm/s

• 15 kgm/s

• 3.0 kgm/s

• 45 kgm/s