1. Momentum
Momentum (p) of an object = product of its mass (m) and its velocity (v)
p = m × v
The unit for momentum is kg·m/s

2. Momentum
Momentum is a separately conserved quantity different from energy
If no net force is acting on an object or on a system of objects, momentum remains constant (or neither its magnitude nor its direction changes with time)

3. Momentum
However, an object can transfer its momentum to another object
We can understand this conservation mathematically as:
m1v1i + m2v2i = m1v1f + m2v2f

4. Momentum Practice Problems:
1. What is the momentum of a child and wagon if the total mass of the child and wagon is 22 kg and the velocity is 1.5 m/s?
2. The parking brake on a 1200 kg automobile has broken, and the vehicle has reached a momentum of 7800 kg·m/s. What is the velocity of the vehicle?
3. A toy dart gun generates a dart with kg·m/s momentum and a velocity of 4 m/s. What is the mass of the dart?
33 kg·m/s m/s kg