Force

• speed = distance / time (m/s)
• distance = speed x time
• time = distance / speed (s)
• weight = mass x g(9.8)
• moment(Nm) = force(n) x distance(m)
• purity = mass of pure substance / total mass x 100
• relative motion in the same direction = greater speed - smaller speed
• relative motion in different direction = add together
• pressure = force / area
• principal of moments = w1 x d1 = w2 x d2
• the larger the area, the smaller the pressure applied.
• higher temperature = higher gas pressure

  • bigger kinetic energy due to more frequent collision between the gas particles
  • more force exerted to the surface
• when in a circular motion, the speed of the object is constant
• equilibrium = when two forces are balanced and staying the same - the object is either in a constant speed or stationary
• resultant force on an object when it's at equilibrium = 0N(no force)
• acceleration is the change in sped or a direction - force not balanced
• moment is the turning effect of a force and is measured in Nm
• gas pressure is the total force that is acting on a surface area because of the collision of gas particles with the surface.
• normal reaction force is the force that stops objects from falling through solid surfaces
• lift is the force that stops airplanes from falling down through the air
• thrust is the force produced by engines
• friction

  force produced when solid surfaces rub against each other
• air resistance


  force produced when an object moves through the air
• applied force

  force produced when a person pulls or pushes an object
• water resistance

  force produced when an object moves through water
• upthrust


  force that stops object from sinking on water