Force: Force is a push or a pull on an object with mass that can cause it to change its velocity (to accelerate)

Motion: Motion can also be defined as a continuous change in the position of an object

Newton: A newton N is the international unit of measure for force

Balanced force: Balanced forces are two forces acting in opposite directions on an object and are equal in sizes

Unbalanced forces: Unbalanced forces are forces that cause a change in the motion of an object.

Mass: Mass is the actual amount of matter that is contained in an object

Weight: The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity. W=mg

Kilogram/gram : A kilogram Kg / gram g is the international unit of measure for mass

• Objects such as a falling stone or a galloping horse are in motion.

• An object is in motion if its position is changing.

• The motion of an object can be described using four quantities:

Distance (d): how far the object travels

Time (t): how long the journey takes

Speed (v): how fast the object is going (v stands for velocity)

Acceleration (a): how the object's speed is changing over time.