FORCES

• what is a force


  a push or pull on an object
• examples of different forces

  water resistance

  
  

  air resistance

  
  

  friction

  
  

  gravity

  
  

  magnetic

  
  

  bouyancy

  
  

  electrostatic
• contact-forces


  result from physical contact between two objects
• non-contact forces


  the objects don't physically come into contact, e.g. gravity, magnetic force
• what are balanced forces

  equal forces acting on one object in opposite directions

  
• what are unbalanced forces


  Forces that are unequal and result in motion

  
• what is a free body diagram


  a diagram showing all the forces acting on an object

  
• what is the resultant force


  The overall force on a point or object

  
• what is the formula for finding the resultant force

  
• What is Newton's first law?


  An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
• What is Newton's second law?

  Force = mass x acceleration
• What is Newton's third law?

  For every action there is an equal and opposite reaction
• What does F=ma mean?

  Force(N) = mass(kg) x acceleration(m/s^2)
• the bigger the resultant force....

  the bigger the acceleration
• the smaller the resultant force...

  the smaller the acceleration
• the more massive the object...


  the smaller the acceleration
• the less massive the object...

  the larger the acceleration
• heavy things are...


  hard to speed up
• lighter things are...


  easy to speed up