Forces and Motion

Forces and Motion

1. Speed

   • s=d/t
     • Speed=distance/time
   • Units
     • Speed m/s
     • Distance m
     • Time s
   • Amount of time taken for an object to cover a distance
     • How fast it is going

2. Weight

   • w=mg
     • Weight=mass x gravity
   • It is measured in Newtons (N)
     • It is the force of an object due to mass and the amount of gravity

3. Force

   • f=ma
     • Force=mass x acceleration

4. Terminal Velocity

   • Terminal Velocity is when an object falls at a constant velocity in a fluid as the forces acting on it are equal

5. Work Done

   • w=fd
     • Work= force x distance
   • The units are Joules (J)
   • Work done calcuates how much enegry is needed to push an object with a force, a distance

6. Newtons Laws

   • First Law
     • An object will continue to be either stationary or move in a straight line at constant speed, unless resultant force acting on it
   • Second Law
     • Force on object directly proportional to its mass times acceleration f=ma
   • Third Law
     • Every force applied to object surface there is opposite equal reaction force