forces

• scalar quantity is size only
• vector has magnitude and direction
• forces are vector quantities
• when more than one force acts on an object it can appear as a single force that has the same effect as all the forces acting together, this is resulting force
• when work is done energy transfers take place within the system
• if an objects returns to its original shape after the forces are removed it was elasticity deformed
• a resultant force is the sum of all the individual forces acting on an object
• spring constant dictates how easy it is to stretch or compress a spring
• the greater the spring constant the harder it will be to stretch or compress the spring
• distance is a scalar quantity. displacement is a vector quantity
• velocity is a vector quantity
• newtons first law- an object will remain in the same state of motion unless acted upon by an external force
• newtons second law- the acceleration of an object is proportionl to the resultant force acting upon the object
• when an object slows down, the change in velocity is negative so it has a negative acceleration
• newtons third law- for every action there is an equal and opposite reaction
• the weight of an object is the gravitational pull on that object from earth
• mass is constant but gravity changes depending on where you are
• a newton metre is a unit of torque or turning effect