Science B

• To stop an object, we have to apply a force over a period of time.

  Impulse
• Impulse = FΔt Units: N∙s
• F = force (N)
• Δt = time elapsed (s)
• FΔt= mΔv means?

  Impulse = change in momentum
• What is Momentum?

  A symbol “p”, which measures how hard it is to stop a moving object.
• Momentum can be defined as?

  mass in motion
• Momentum depends upon 2 variables:

  Mass & Velocity
• Formula for momentum

  Momentum = mass x velocity / p = m x v
• p = momentum (kg . m/s)
• m = mass (kg)
• v = velocity (m/s)
• An object’s momentum will change if its mass and/or velocity (speed and direction) changes.
• To find momentum, p = m . v


  Unit: kg . m/s
• To find velocity, v = p/m


  Unit: m/s
• To find mass, m = p/v


  Unit: kg
• Mathematically;

  M1V1+M2V2= M1V1’+M2V2’
• M1 = mass of the first object in kilogram (kg);
• V1 = velocity of the first object before collision in meter per second (m/s);
• M2 = mass of the second object in kilogram (kg);
• V2 = velocity of the second object before collision in meter per sec (m/s);
• V1’ = is the velocity of object 1 after collision
• V2’ = is the velocity of object 2 after collision
• M1’= is the first object’s mass after collision
• M2’= is the second object’s mass after collision
• The momentum of an object depends upon the object's ___________&_____________.

  mass and velocity
• Momentum is a ____________________ quantity

  vector
• What is the definition of momentum?

  Mass in Motion
• What is the definition of impulse?

  The time integral of net force that causes change in momentum
• Impulse is represented by which symbol?

  I and J
• All of the following are examples of impulse except.

  A car moving with constant speed

  B. A tennis ball hitting a racket

  C. A pencil getting stuck to the ceiling

  D. A hammer bouncing of a nail
• During a collision. An object experiences an impulse. How can this impulse be calculated?

  Multiplying force by time
• Which of the following does the impulse-momentum equation implies?

  It states that the change in momentum = impulse
• The impulse-momentum theorem states that?

  The impulse on an object is equal to the change in momentum it causes
• T/F

  Momentum can be transferred from one object to another.

  True
• T/F

  All moving objects don’t have momentum.

  False
• T/F

  The momentum of an object can change

  True
• T/F

  Direction does not matter when you are measuring momentum.

  False
• T/F

  When an object speeds up, it gains momentum.

  True
• T/F

  A tiny bullet can have more momentum than a huge truck.

  True