Newtons Laws of physics
Newtons 3 physic laws and how they work
For example, a ball sitting on a completely flat surface will stay sitting there unless a person acted on it, pushing it. It would stay moving unless an outside force acted on it.
The way an object moves is related to it's mass, if a toy car has little mass it would be easier to push. The mass of a real car has a lot more mass and therefor harder to push.
Acceleration is the change of an objects velocity during a given amount of time.
So how much force you would need to apply to the car is equal to if you did the cars mass, times it's acceleration.
According to this law, everything in nature always acts in pairs.
Take a frog leaping off a lillypad. The frog applies force down onto the lilly pad to jump and therefore pushes it down, pushing the frog upwards.
Or a helicopter lifting off, the air pushed down from the blades bounces off the ground and helps to push the helicopter upwards.