Quiz Chapter 9: Momentum

Definition of impulse:

• The time integral of net force that causes Change in momentum

• The product of mass and velocity

• The ability to do work

• the rate of increase of speed or the rate of change of velocity

Tags

NGSS.HS-PS2-2

The law of conservation of momentum states that, 

• p before is less than p after
• p before is the same as p after
• p before is more than p after

Tags

NGSS.HS-PS2-2

The momentum of an object depends upon the object's ___________&_____________.  

• size and shape
• mass and speed
• mass and veloctiy
• mass and energy

Tags

CCSS.7.RP.A.3

In any collision (crash) the ______ is ALWAYS constant

• Total Momentum
• total speed
• total Velocity
• Energy

Tags

NGSS.HS-PS2-2

A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. If the 9300 kg stopped because of the impact, the speed of the second boxcar is

• 18.6 m/s

• 9.3 m/s

• 7.5 m/s

• 1.86 m/s

A runner has a momentum of 720 kg m/s and is traveling at a velocity of 5 m/s. What is his mass?

• 14.4 kg
• 1400 kg
• 144 kg
• 360 kg

Tags

NGSS.HS-PS2-2

When the speed of an object is doubled, its momentum

• remains unchanged in accord with the conservation of momentum.
• doubles
• quadruples
• decreases

Tags

NGSS.HS-PS2-2

Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:

• 2 m/s 
• 3.4 m/s 
• 4.6 m/s 
• 7.1 m/s

Tags

NGSS.HS-PS2-2

Which of the following correctly explains why less force is required to stop a person using an airbag?

• hitting the airbag decreases the person's momentum
• the airbag changes the person's momentum over a longer time interval
• the airbag is very soft, like a pillow
• decreasing the time of the impact decreases the force of the impact

Tags

NGSS.HS-PS2-3

Is momentum a scalar or a vector quantity?

• A Vector
• A Scalar