Every object persists in its state of rest or uniform motion in a straight line unless it is compelled to change that state by forces impressed on it.

An object's motion will not change until an unbalanced force acts on the object. An object will not start to move until an unbalanced force acts on it.

Force is equal to the change in momentum per change in time. For a constant mass, force equals mass time acceleration. F=ma

The larger the unbalanced force on an object, the more the object's motion will change. The larger the object's mass, the smaller its acceleration will be.

For every action, there is an equal and opposite reaction.

Action forces always produce reaction forces. Action forces and reaction forces are always equal in size, but act in opposite directions.

Inertia is the tendency of an object to resist changes in its velocity: whether in motion or motionless.

the object has gained kinetic energy.

Gravity, Magnetism, Electrostatic

Sliding friction(ice skating), rolling friction(bowling), fluid friction(air or water) air or water resistance

Lubrication, streamlining (aerodynamics), slowing down, smoothing surfaces

Because of inertia, objects resist their change in motion. When car that is going 80 km/hour is stopped by a brick wall, your body keeps moving at 80 km/hour.

F=mxa

The net force of an object is equal to the product of its mass and acceleration, or F=ma or m=f/a or a=f/m.

the unit of force is in Newtons.

required to accelerate one kilogram of mass at one meter/second/second.

If force remains constant, doubling the mass, halves the acceleration.

but with different forces.

9.8m/s/s

are equal, in opposite directions, and happen at the same time.

up-lift, right-drag, down-weight, left-thrust

Various fuels are burned in the engine, producing hot gases.

As gases move downward, the rocket moves in the opposite direction.

your body exerts a downward force on the chair and the chair exerts an upward force on your body.

m/s2