Momentum Impulse Card Thingies Grade 11

note cards for physics class because why not

A stationary 0.75 kg hockey puck is launched to 72 km/h horizontally by a hockey stick. How much impulse did the hockey puck experience?

72 km/h / 3.6 = 20 m/s

0.75 kg * 20 m/s = 15 kg*m/s

A hockey puck with a mass of 0.115 kg and a velocity of 35 m/s hits a stationary rubber octopus on the ice. They slide off together. What is their velocity?

m₁v₁ + m₂v₂ = m₁v₁’ + m₂v₂’

m₁v₁ = (m₁ + m₂) v’

m₁v₁ / m₁ + m₂ = v’

0.115 kg * 35 m/s / 0.265 kg + 0.115 kg = 10.6 m/s

A 0.15 kg baseball is thrown to the left with a speed of -40 m/s. It is hit by a baseball bat and leaves in the opposite direction with a speed of 50 m/s. What is the change in momentum of the baseball?

0.15 kg * -40 m/s = -6 kg*m/s

0.15 kg * 50 m/s = 7.5 kg*m/s

7.5 - (-6) = 13.5 kg*m/s

A 35 g bullet moving at 475 m/s strikes a 2.5 kg wooden block at rest. The bullet pierces the block and leaves at 275 m/s. How fast is the wooden block moving when the bullet leaves it?

35 g / 1000 = 0.035 kg

m₁v₁ + m₂v₂ = m₁v₁’ + m₂v₂’

if v₂ = 0 then m₁v₁ = m₁v₁’ + m₂v₂’

m₁v₁ - m₁v₁’ / m₂ = v₂’

m₁v₁ = 0.035 kg * 475 m/s = 16.625 kg*m/s

m₁v₁’ = 0.035 kg * 275 m/s = 9.625 kg*m/s

16.625 kg*m/s - 9.625 kg*m/s = 7kg*m/s

m₂ = 2.5 kg

7 kg*m/s / 2.5 kg = 2.8 m/s