6th Week: Linear Momentum

State the momentum-impulse theorem and explain its significance.

• Impulse is defined as the product of mass and velocity.

• The momentum-impulse theorem states that momentum is conserved in all collisions.

• The momentum-impulse theorem states that the change in momentum of an object is equal to the impulse applied to it.

Calculate the impulse experienced by a 5 kg object that changes its velocity from 2 m/s to 8 m/s.

• 25 kg·m/s

• 20 kg·m/s

• 30 kg·m/s

In which case is the average force acting on the ball during the collision the biggest?

• case 1

• both are equal

• case 2

Airbags do not take the place of seat belts. Air bags provide additional protection. They are intended to be used in conjunction with seat belts to increase safety. How does the air bag protect you? Explain using the concepts of impulse and momentum!

• Airbags increase the time in an accident which decreases the force

• Air bags decreases the time in an accident which increase the force

• Not related to momentum and impulse

Objects with mass of 2 kg and 3.5 kg move with velocity of 3𝑖̂+2𝑗̂ m/s and -5𝑖̂+4𝑗̂ m/s, respectively. What is the total momentum of the two-particle system?

• 13i + 18j kg.m/s

• 11,5i + 20j kg.m/s

• -11,5i + 18j kg.m/s