Force

• Straight line / - directly proportional
• Mass - the amount of matter in an object,(it can’t be created or destroyed)
• Weight - is a force pulling an object towards the centre of the Earth. It has a direction and can change. It gets smaller as you rise upwards from ground level. Weight is measured in N.
• Gravity - is the force that pulls objects to the earth, it is always acting on all objects.
• The bigger the force applied, the more energy is stored in a body (in the spring).
• Maximum height - least kinetic energy
• Hookes law - if you apply force to a spring then it extends
• Force can cause a stationary object to move
• Force causes an object to change its speed or direction of movement
• Contact force - touchs an object to change its shape speed or direction of movement ( elastic force- elastic band)
• Uptrust - a boat - force pushing the object up to keep it floating
• Surface tension - force that cause a molecule on the surface to form a layer - raindrop
• gravitational force - non contact force
• Newton

  • That an object that isn’t moving will not move
  • The acceleration of an object is directly proportional To the strength of the force applied. (F x m. )
  • For every action there’s an equal and opposite reaction
• F = mass by acceleration
• Weight - newtons - mass x acceleration due to gravity (10)
• Lever - clockwise moments are equal to anti clockwise moments
• Friction - opposition to motion
• Gravity - force that holds the atmosphere of the earth
• Pressure - pascal ( pa)
• Work = force x Distance