forces in motion

• velocity is the speed of an object in a given direction
• if an object is not travelling in a straight line

  • the speed is constant
  • the velocity will change

  if an object is moving in a circle

  • constantly changing velocity
  • is accelerating
• newtons first law

  • an object will remain in the same state of motion unlessacted on by an external force
  • the tendency or an object to continue in the same state of motion is called intertia
• distant - time graphs

  • represent motion of an object travelling in a straight line
  • speed can be found using the gradient
• velocity - time graphs

  • gradient tells you acceleration
  • the area under the graph tells you distance
• newtons second law is often stated as the acceleration of an object is proportional to the resultant force acting on the object and inversley proportional to the mass
• mass is a measure of inertia
• terminal velocity

  • first the object speeds up due to the force of gravity
  • as it speeds up , the resistive force increases
  • the resultant force reaches zero when the forced balance
  • at this point the object falls at a steady speeed
• newtons thirs law

  • for every action there is an equal opposite reaction