Forces

• The weight of an object depends on the mass of the object and the strength of gravity at the location where it is placed.
• Forces are measured using newtons (N)
• A force is anything that causes an object to change its speed, direction or shape
• Weight = Mass x Gravity
• A force can be described as a push or pull
• Gravitational field strength (g) varies with altitude above sea level, latitude, and local geology.
• At the Earth's surface, g has a value of approximately 9.8 N/kg or 10 m/s^2.
• When two forces act together, they produce a resultant force which has both magnitude and direction
• If two forces have equal magnitudes but opposite directions, their resultant will be zero