Things in motion will keep going until a force such as friction will slow them down until they slow down
Example: If a car was going along a road and its engine was off, the car will eventually stop because of the friction between the road and tyres. If a rocket was pushed into outer space it'll keep going because no force is there to stop it.
Newtons second law:
Things with a heavier mass will accelerate slower than a thing with a lighter mass.
Example: If two skateboards are pushed by the same time and one of them has a load of books on it, the one with no weight will go further.
f=ma Force= Mass x Acceleration
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