An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
If you leave an eraser on the table it will not move unless a force is applied to it. If you ride a bike it wil keep rolling until an outside force stops it.
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
If you use the sam e force to push a truck and push a car, the car will have more acceleration than the truck, because the car has less mass.
The principle stating that for every ac tion there is an equal and opposite reaction. Thus, if one body exerts a force F on a second body, the first body also undergoes a force of the same strength but in the opposite direction.
when swimming you push yourself forward by moving your hands downward