Conservation of Momentum

The total momentum before a collision is _________ the total momentum after a collision.

• equal to 
• less than 
• more than
• It depends on the type of collision

Tags

NGSS.HS-PS2-2

Before the canon fires a cannon ball, both sit at rest. A person can confidently say the total momentum is...

• zero

• non-zero

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, which equation correctly enforces the principle of conservation of momentum to determine the combined speed of the two players just after the collision?

• mv = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = mv'

• m₁v₁ + m₂v₂ = m₁v₁ + m₂v₂

Tags

NGSS.HS-PS2-2

Two groups of canoeists meet in the middle of a lake. After a brief visit, a person in Canoe 1 (total mass 130 kg) pushes on Canoe 2 (total mass 250 kg). Canoe 2 moves away with a speed of 0.22 m/s. Which equation correctly enforces the principle of conservation of momentum to determine the speed of Canoe 1?

• mv = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = mv'

• m₁v₁ + m₂v₂ = m₁v₁ + m₂v₂

Tags

NGSS.HS-PS2-2

A moving bomb explodes. Which equation correctly enforces the principle of conservation of momentum to determine the speed of fragment #2?

• mv = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = mv'

• m₁v₁ + m₂v₂ = m₁v₁ + m₂v₂

Tags

NGSS.HS-PS2-2

A 110-kg fullback moving east at 1.80 m/s on a snowy playing field is struck by a 140-kg safety moving west at 1.50 m/s. The fullback is bounced west at 0.250 m/s. Which equation correctly enforces the principle of conservation of momentum to determine the speed of the safety just after impact?

• mv = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = mv'

• m₁v₁ + m₂v₂ = m₁v₁ + m₂v₂

Tags

NGSS.HS-PS2-2

A basketball player and her wheelchair (player 1) have a combined mass of 58 kg. She moves at 0.60 m/s and pushes off a stationary player (player 2) while jockeying for a position near the basket. Player 1 ends up moving at -0.20 m/s. The combined mass of player 2 and her wheelchair is 85 kg. Which equation correctly enforces the principle of conservation of momentum to determine player 2’s speed immediately after the interaction?

• mv = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = mv'

• m₁v₁ + m₂v₂ = m₁v₁ + m₂v₂

Tags

NGSS.HS-PS2-2

A wooden block attached to a glider has a combined mass of 0.200 kg. Both the block and glider are at rest on a frictionless air track. A dart gun shoots a 0.012-kg dart into the block. The velocity of the block-dart system after collision is 0.78 m/s. Which equation correctly enforces the principle of conservation of momentum to the speed of the dart just before it hit the block?

• mv = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂'

• m₁v₁ + m₂v₂ = mv'

• m₁v₁ + m₂v₂ = m₁v₁ + m₂v₂