5.1. Momentum

• The SI unit of momentum is kg m/s
• Match the type of collision with its property:

  Elastic collision ↔️ Kinetic energy conserved

  Inelastic collision ↔️ Kinetic energy not conserved
• The unit of impulse is N·s
• What is the definition of momentum in physics?

  Mass times velocity
• What is the key difference between elastic and inelastic collisions in terms of kinetic energy?

  Kinetic energy is conserved in elastic collisions
• No energy is lost during an elastic collision.

  True
• The formula for momentum is $p =$$mv$, where $p$ represents momentum
• What is impulse defined as in physics?

  Change in momentum
• The Law of Conservation of Momentum states that the total momentum of an isolated system remains constant if no external forces
• Match the type of collision with the conservation of kinetic energy:

  Elastic Collision ↔️ Conserved

  Inelastic Collision ↔️ Not Conserved
• What is the relationship between impulse and momentum?

  Impulse = Change in Momentum
• Inelastic collisions conserve kinetic energy.

  False
• What is the unit of force in SI units?

  N (kg m/s²)
• Momentum is always conserved in all types of collisions
• What happens to kinetic energy in an inelastic collision?

  It is converted to other forms
• The unit of momentum is kg m/s.


  True
• The impulse-momentum equation is $J =$$\Delta p$, where $J$ represents impulse
• The total momentum of a closed system can change if no external forces act upon it.

  False
• In an elastic collision, both kinetic energy and momentum are conserved
• In inelastic collisions, kinetic energy is not conserved as it is converted to other forms like heat or deformation
• In elastic collisions, both kinetic energy and momentum are conserved.
• Momentum is a scalar quantity.

  False
• What happens to kinetic energy in an elastic collision?

  It is conserved
• Steps in a collision scenario using the Law of Conservation of Momentum:

  1️⃣ Identify the isolated system

  2️⃣ Calculate the total initial momentum

  3️⃣ Determine the final conditions

  4️⃣ Apply the Law of Conservation of Momentum

  5️⃣ Solve for the unknown variables
• Categorize the types of collisions based on momentum and kinetic energy conservation.

  1️⃣ Elastic collision: Kinetic energy is conserved

  2️⃣ Inelastic collision: Kinetic energy is not conserved
• External forces such as friction or air resistance can prevent momentum conservation
• In an elastic collision, the total kinetic energy before the collision equals the total kinetic energy after
• Is momentum a vector or a scalar quantity?

  Vector
• Match the concept with its unit:

  Momentum ↔️ kg m/s

  Force ↔️ N (kg m/s²)

  Energy ↔️ J (kg m²/s²)
• What is the Law of Conservation of Momentum?

  Total momentum is constant
• The ice skater example demonstrates that momentum is conserved because the final total momentum equals the initial total momentum.

  True
• Inelastic collisions result in the conversion of kinetic energy to other forms of energy, such as heat or deformation.

  True
• In both elastic and inelastic collisions, momentum is always conserved.


  True
• Match the collision type with its properties:

  Elastic ↔️ Kinetic energy conserved

  Inelastic ↔️ Kinetic energy not conserved
• What type of quantity is momentum?

  Vector
• What is the definition of momentum?

  Mass × Velocity
• Impulse is measured in kg m/s.

  False
• How is the unit of momentum derived?

  $p =$$mv$
• Momentum is conserved when the total momentum of a system remains constant
• The Law of Conservation of Momentum applies only when external forces act on the system.

  False