# physics

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• physics
• displacement
• Distance in a given direction.
• What is the difference between a vector and a scalar quantity?
• vectors have direction as well as a magnitude.
• what is newtons third law of motion?
• When two objects interact they exert equal and opposite forces onto each other.
• what is newtons first law of motion?
• If the forces acting on an object are balanced, then the resultant force should equal zero.
• what is meant by resultant force?
• The sum of all the forces acting on an object.
• what is meant by the centre of mass?
• The point on an object where its mass is the most concentrated.
• why do we use a parallelogram of forces?
• To find the resultant of two forces which don't act along the same line.
• how to calculate distance travelled?
• The speed multiplied by the time.
• To find the speed of the object at any given time.
• To find the speed of the object at any given time.
• state the equation for acceleration
• Change in velocity/time taken.
• what is velocity?
• Speed in a given direction.
• what is deceleration?
• The change in velocity per second as an object slows down.