# Tell us about the system of actions (algorithm) when solving problems for the application of: a) the law of conservation of momentum;

**Tell us about the system of actions (algorithm) when solving problems for the application of: a) the law of conservation of momentum; b) the law of conservation of total mechanical energy.**

a)

1 Select reference system

2 Consider a system of interacting bodies

3 Determine the impulses of the bodies of the system before and after interaction

4 Apply the law of conservation of momentum to a system of interacting bodies, write it down in vector form and in projections onto the coordinate axis

5 Solve the equation for the desired physical quantity

6 Substitute numerical data and hang up the answer

b)

1 Select reference system

2 Consider a system of interacting bodies

3 Select at least two positions of the body (system of bodies) and determine for them the kinetic potential and total mechanical energy

4 Determine the zero level of potential energy

5 Write down the equation of the law of conservation of total mechanical energy for the selected position of the body

6 Solve the equation for the desired physical quantity

7 Substitute numerical data and record the answer