1_1.3 and 1.4 mindmap

1_1.3 and 1.4 mindmap

1. Pushes, Pulls or Twists

2. Isaac Newton

   • Ist law of motion
     • An object will remain this way unless it is acted upon by a force
     • An object that that is moving will continue to move in the same direction unless an unbalanced force acts upon it
     • Inertia
       • The tendency to resist any change in motion
   • 2nd law of motion
     • An object will accelerate in the direction of an unbalanced force acting upon it. The size of this acceleration depends upon the mass of the object and the size of the force acting
   • 3rd law of motion
     • For every action force there is an equal or opposite force
       • The nail is hit by a hammer (action). The nail exerts an equal force back on the hammer
   • F=MxA

3. Work

   • Work is a measure of the amount of energy used in moving the object
   • Work done= Force applied x Distance moved
   • Measured in joules
   • Power
     • Power is the rate that work is done or how fast energy is used
     • Power= work done divided by time

4. Energy

   • Kinetic energy
     • The energy of a moving object
     • kinetic energy= half of ( mass x speed squared)
     • Doubling the mass of a moving object doubles it's kinetic energy. This shows that increasing speeds are dangerous
   • Potential energy or stored energy
     • The energy an object has because of it's position and structure
   • Elastic Potential energy
     • the energy a stretched or compressed string has.
     • The energy is converted to kinetic energy when the spring is released
   • Gravitational Pootential energy
     • The energy an object has positioned above ground
     • GP energy= mgh
   • The law of conservation of energy states that an object is transferred , but is never crea
   • Efficiency
     • A measure of how much useful energy is produced
     • Efficiency= useful energy divided by total energy x 100%