Force - Is a push or a pull on an object. A force can change the motion of an object (its speed and/or direction)., Contact force -  Contact forces can only act when objects are touching each other e.g. pushing a book across the table, Non contact force - Non-contact forces can act without the objects touching each other due to the objects interacting with a field, e.g. a gravitational, electrical, or magnetic field., Balanced forces - The forces acting on an object are equal and opposite, Unbalanced forces - The forces acting on an object are NOT equal and opposite. (Net force does not equal zero), Stationary - The object has no motion, Constant speed - The object is moving but the speed is not changing, Acceleration - The object's speed is increasing. If the acceleration is described as negative acceleration the speed is decreasing (decelerating), Deceleration - The object's speed is slowing down, Net force - The sum of all forces acting on an object., Fricton - Friction is common force that opposes motion,

Year 11 Science - Forces and Motion 1

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