Science

• What is scalar?

  Physical quantity described by its magnitude
• What is a vector?


  A quantity of direction and magnitude.
• What is the formula for speed?


  speed= distance/time
• What is the equation for acceleration


  Final velocity-starting velocity / time
• Newtons 1st law


  If an object at rest it stays at rest.
• Newtons 2nd law


  An object will accelerate in response to resultant force.
• Newtons 3rd law


  For every force, there is equal reactions
• Gravitational potential energy equations


  mass x gravitational field x height
• Kinetic energy equation


  0.5 x mass x speed
• What is mass and weight?


  Mass is how much matter is on an object

  Weight is the size of gravity acting on an object.
• What energy stores are there?


  Kinetic, magnetic and thermal
• What energy transfers are there?


  electrical, heating, mechanical and radiation.
• What is renewable energy?


  Energy from a source that won't run out. (hydroelectric, wind, solar)
• What is refraction?


  Bending of light passing through a medium.
• Transverse waves


  Wave direction at a right angle. (light waves)
• Longitudinal waves

  Waves travelling parallel. (sound waves)
• Equation for wavelength


  velocity / frequency
• Long & Short wavelengths


  Short wavelength = high frequency

  Long wavelength = low frequency
• Radiation


  Emitting energy in the form of waves or particles.
• Half life graph


  Shows how activity of a radioactive sample changes over time.