forces

• what quantity only has a magnitude?

  scalar
• what quantity has magnitude and direction?

  vector
• what is used to represent a vector quantity?

  an arrow
• what does length of a vector arrow represent?

  magnitude
• what does direction of a vector arrow represent?

  direction
• what is a push or pull that acts on an object due to interacting with another object?


  a force
• what type force occurs when objects are physically touching?

  contact
• what force occurs when objects are physically separated?

  non-contact
• what type of force is friction?

  contact
• what type of force is air resistance?


  contact
• what type of force is tension?

  contact
• what type of contact is normal contact?

  contact
• what type of force is gravitational force?

  non-contact
• what type of force is electrostatic force?

  non-contact
• what type of force is magnetic force?

  non-contact
• what quantity is force?

  vector
• what is name of force acting on an object due to gravity?

  weight
• what is equation linking weight, mass and gravitational field strength?

  weight = mass x gravitational field strength
• what is standard unit for weight?

  N (newtons)
• what is standard unit for mass?

  kg (kilograms)
• what is the point called where the weight of an object is considered to act at a single point?

  centre of mass
• what is relationship between weight and mass of an object?

  they're directly proportional
• how can weight be measured?

  using a newtonmeter
• what does weight of an object depend on?

  gravitational field strength at the point where the object is
• what is the single force that replaces a number of forces acting on an object?

  resultant force
• what is done when a force causes an object to move through a distance?

  work
• what is equation linking force, distance and work done?

  work done = force x distance
• what is standard unit for work done?

  Joules
• how much work is done when a force of 1 Newton causes a displacement of 1 metre?

  1 Joule
• how many Joules is equivalent to 1Nm?

  1
• how many forces need to be applied to change the shape of an object by stretching, bending or compressing?

  more that one
• what is an object called that returns to its original shape after stretching?

  elastic
• what is relationship between extension of an elastic object and force applied to it?

  directly proportional
• what is point where an object no longer acts elastically?

  limit of proportionality
• what is equation linking extension, force and spring constant?

  force = spring constant x extension
• what is standard unit of spring constant?

  N/m
• what is the work done on a spring and elastic potential energy stored like in relation to eachother if a spring is stretched elastically?

  they're equal
• what word describes how for an object moves?

  distance
• what type of quantity is distance?

  scalar
• what word describes both the distance an object moves in a straight line and direction of the straight line?

  displacement