Arun Minhas

Newton's First Law of Motion states that a body at rest will remain at rest unless an outside force acts on it, and a body in motion at a constant velocity will remain in motion in a straight line unless acted upon by an outside force. If a body experiences an acceleration ( or deceleration) or a change in direction of motion, it must have an outside force acting on it. Outside forces are sometimes called net forces or unbalanced forces. The property that a body has that resists motion if at rest, or resists speeding or slowing up, if in motion, is called inertia. Inertia is proportional to a body's mass, or the amount of matter that a body has. The more mass a body has, the more inertia it has. The Second Law of Motion states that if an unbalanced force acts on a body, that body will experience acceleration ( or deceleration), that is, a change of speed. One can say that a body at rest is considered to have zero speed, ( a constant speed). So any force that causes a body to move is an unbalanced force. Also, any force, such as friction, or gravity, that causes a body to slow down or speed up, is an unbalanced force. This law can be shown by the following formula F= ma F is the unbalanced force m is the object's mass a is the acceleration that the force causes If the units of force are in newtons, then the units of mass are kilograms and the units of acceleration are m/s2. If the units of force are in pounds (English), then the units of mass are in slugs, and the units of acceleration are ft/s2. Motion of an object that is not accelerated (moving at a constant speed and in a straight line) can be found using the formula d= v t d is the distance traveled v is the rate of motion (velocity) t is the time