Unit 6: Momentum Review

A 70 kg student holding a 5 kg backpack rides a 2 kg skateboard down the sidewalk at 6 m/s. What is the total momentum of the student, backpack, and skateboard in units of kg*m/s? Show your work. Record your answer. Be sure to use the correct place value

Tags

NGSS.HS-PS2-2

A hammer strikes a nail with a 15 N force for 0.03 seconds. Calculate the impulse of the hammer.

• 0.45 N*s

• 0.10 N*s

• 0.045 N*s

• 4.5 N*s

Tags

NGSS.HS-PS2-1

What is the magnitude of velocity for a 6,000 kg car possessing 9,000 kg·m/s of momentum?

• 1.5 m/s

• 54000000 m/s

• 0.67 m/s

• 15000 m/s

Tags

NGSS.HS-PS2-2

What is the mass of a baseball thrown at 27 m/s resulting in a momentum of 11 kg·m/s?

• 0.41 kg

• 297 kg

• 2.5 m/s

• 38 kg

Tags

NGSS.HS-PS2-2

Which of the following has the greatest momentum?

• .01 kg mass moving at 200 m/s

• 1 kg mass moving at 35 m/s

• 100 kg mass moving at 3 m/s

• 2,000 kg mass moving at 0.1 m/s

Tags

NGSS.HS-PS2-2

A force of 750 N is exerted on a baseball by the bat for 0.005 s. What is the change in momentum of the baseball?

• 3.8 kg*m/s

• 150000 kg*m/s

• .0000067 kg*m/s

• 0.5 kg*m/s

Tags

NGSS.HS-PS2-1

If both the mass and the velocity of a moving object are tripled, how will the object's momentum change?

• Its momentum will be tripled

• Its momentum will also be nonuplets

• Its momentum will remain unchanged.

• There is not enough information to answer.

Tags

NGSS.HS-PS2-2

Object A and object B are moving with the different momentum. Which of the following statements must be true?

• They must have the same mass and velocity.

• The products of their mass and velocity must be equal.

• They must have the same mass, but not necessarily the same velocity.

• They must have the same velocity, but not necessarily the same mass

Answer explanation

They are not equal

Tags

NGSS.HS-PS2-2

Which has a greater momentum, a 1550 kg car traveling at 32 m/s or a 250,000 kg train traveling at 0.8 m/s? Support your answer with calculations and explanations.

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Answer explanation

The train has a greater momentum than the car. The car has a momentum of 1550*32 = 49,600 kg*m/s while the train has a momentum of 250,000*0.8 = 200,000 kg*m/s. Though the train is barely moving, it has a much larger momentum than the car because it has a significantly larger mass.

Tags

NGSS.HS-PS2-2

Two people of equal mass are running in opposite directions at the same speed. What can be said about the total momentum of these two people? Explain your answer.

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Answer explanation

Their total momentum must be 0. They have the same mass and the same speed, but are moving in opposite directions, so their velocities have opposite signs. Hence, their total momentum is P = mv - mv = 0.

Tags

NGSS.HS-PS2-2