p5 - forces

• force

  a push or pull that acts on an object due to its interaction with another object

  a vector quantity
• 2 types of forces

  contact forces - objects that are physically touching

  non-contact forces - objects that are physically separated
• examples of contact forces

  tension, friction, air resistance
• examples of non-contact forces

  gravitational force, electrostatic force, magnetic force
• scalar quantities + examples

  only have magnitude

  examples: speed, mass, time, distance, temperature
• vector quantities + examples

  have both magnitude and direction

  examples: velocity, displacement, acceleration, force, momentum
• resultant force


  overall force on an object
• weight

  the force acting on an object due to gravity

  weight = mass x gravitational field strength

  measured in Newtons
• force equation (elasticity)

  F = k * e

  force (N) = spring constant (N/m) * extension (m)
• elastic potential energy equation

  E = 1/2 * K * e^2

  elastic potential energy = 0.5 * spring constant * extension^2