Conservation of Momentum and Energy

Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?

• car
• bike
• they are equal
• cannot determine using the info provided

Tags

NGSS.HS-PS2-2

The equation to calculate momentum is

• p=mv
• p=1/2mv²
• p=mgh
• p=mg

Tags

NGSS.HS-PS2-2

Determine the momentum of 1000-kg car moving southward at 20 m/s......... 

• 20000 N
• 20000 Joules
• 20000 Kg * m/s south
• 10000 kg * m/s south

Tags

NGSS.HS-PS2-2

A 2.5 kg ball moving at 5 m/s collides with a 2.5 kg stationary ball in a perfectly elastic collision (momentum is completely transferred). What is the velocity of the second ball after the collision?

• 5 m/s

• 2.5 m/s

• 10 m/s

• 7.5 m/s

Tags

NGSS.HS-PS2-2

When two objects collide, the P_before is ____________ the P_after.

• more than 
• less than 
• equal to
• unrelated to

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

CHALLENGE QUESTION (not on test): A .030 kg bullet is fired from a gun with a speed of 350 m/s. If the gun has a mass of 0.9 kg, What is the recoil speed of the gun? (hint: Newton's 3rd law saws every action has an equal and opposite reaction (the momentum of object A = the momentum of object B))

• 11.7 m/s

• 9.0 m/s

• 10.5 m/s

• 10 m/s

Tags

NGSS.HS-PS2-2

At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

• A
• B
• C
• D

Tags

NGSS.HS-PS3-2

At which point(s) on the roller coaster is the kinetic energy at its maximum?

• A
• B
• C
• D

Tags

NGSS.HS-PS3-2

In diagram 2, if the mass of the car is 600 kg, what is the change in potential energy from point A to point B?

• 411,600 J
• 294,000
• 176,400 J
• 117,600 J

Tags

NGSS.HS-PS3-1