For every action there is an equal and opposite reaction.

Acceleration depends on two variables, the mass of the object and the amount of force.

For every action there is an equal and opposite reaction.

Every mass exerts a force on every other mass.

An object at rest tends to stay at rest.

Friction opposes the motion of an object.

Newton's first law

Newton's second law

Newton's third law

Conservation of momentum

Cart 1

Cart 2

Cart 3 

Cart 4

15 m/s^2

5 m/s^2

.5 m/s^2

10 m/s^2