What is an impulse? What are the formulas for momentum, change in momentum, and

Question

What is an impulse? What are the formulas for momentum, change in momentum, and impulse? Describe the two types of collisions. What are the formulas for the conservation of momentum? Draw a force vs time graph for a car crash and a car stopping at a stop light. What would happen to the momentum of an object if the mass is doubled? If the velocity was halved? What would happen to the momentum if the mass was tripled and the velocity doubled? What is the momentum of an object that is 35 kg and is traveling 15 m/s? What is the change in momentum of a 5 kg object that hits the ground at 10 m/s and rebounds in the opposite direction at 113 m/s? What impulse must be applied to a 2 kg skateboard to cause a velocity change of 5 m/s? What is the mass of a football player that has a momentum of 4 kg-m/s and is traveling at 3m/s?

Explanation / Answer

Q7.

Momentum = mass*velocity

P = m*v

A. mass is doubled

P2 = m2*v2

v2 = v

m2 = 2*m

P2 = 2*m*v

momentum will be doubled, if mass is doubled

B. velocity was halved

v2 = v/2

m2 = m

P2 = m*v/2

momentum is also halved if velocity is halved

C. mass tripled and velocity doubled

m2 = 3*m

v2 = 2*v

P2 = m2*v2 = 3*m*2*v

P2 = 6*m*v

momentum will be six times in this case.

Q8.

Momentum of an object is given by

P = mass*velocity

given

mass = 35 kg

V = 15 m/sec

P = 35*15 = 525 kh-m/sec

Q9.

change in momentum

dP = P1 - P2

dP = m*v1 - m*v2 = m*(v1 - v2)

v1 = 10 m/sec

v2 = -113 m/sec

dP = 5*(10 - (-113)) = 615 kg-m/sec

Q10.

Impulse is given by

I = change in momentum

I = dP

I = m*dV

dV = 5 m/sec

m = 2 kg

I = 2*5 = 10 kg-m/sec

Q11.

Momentum = mass*velocity

P = m*v

P = 4 kg-m/sec

v = 3 m/sec

mass = P/v

mass = 4/3 = 1.33 kg

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.