Newton's 3 Laws of Motion

By Isabella Droz

Newton's First law of Motion


An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Like when cars approach each other in a car-crash test lab, they move forward steadily. The kinetic energy the car possesses only affects the motion of the car when a force (push or pull) is applied to the objects.

Newton's Second law of Motion

The law that the sum of the forces acting on a body is equal to the product of the mass of the body and the acceleration produced by the forces, with motion in the direction of the resultant of the forces. When two cars collide, the front of each car exerts a force on the other car, slowing it down. When this happens, kinetic energy is converted to other forms of energy, such as heat and sound, while the front of the cars crumple. The forces in the object cause the energy the object (car) that it sustains. The energy changes the speed or motion the car travels.

f= m x a

Newton's Third law of Motion

Action / reaction-

The law that for every force acting on a body, the body exerts a force having equal magnitude and the opposite direction along the same line of action as the original force. So in this case, its impossible for one car to push on the other without it experiencing a push back with equal force. For every action/energy acting on the object, there is an equal and opposite reaction from the force to the object and then affects the motion/speed the car drives.