Tuition Centre Singapore Physics Tuition – Forces Important Definitions

1. Newton’s First Law of Motion states that an object will continue in its state of rest or uniform motion unless acted upon by an external force.
2. Newton’s Second Law of Motion states that for an object with constant mass, the net external force F acting on the object is equal to the product of its mass m and acceleration

           F= ma

3. Newton’s Third Law of Motion states that, for every action, there is an equal and opposite reaction. In other words, if object A exerts a force on object B, object B will exert the same force but opposite in direction on object A.
4. The SI unit for force is the newton (N).
5. A free body diagram can be drawn to identify all the forces acting on an object.
6. When forces on an object are balanced, the net force and acceleration are zero. Therefore, the velocity of the object is constant. When forces are unbalanced, the net force and acceleration are non-zero. Therefore, velocity is not constant.
7. Force is a vector Net force can be determined using a vector diagram.
8. Friction is the force that opposes the motion between two objects that are in contact with each other.
9. Friction can prevent or slow down motion. It causes wear and tear and generates heat.

Please contact Mr Ong @ 9863 9633 or Angie @ 96790479 if you need help in O level Pure or combined Physics