These notes cover Section B as per the IEB Physical Science SAGS. included are notes on the (1) Different kinds of forces, (2) Force Diagrams and free body diagrams and (3) Newtons First, Second and Third laws. These notes are detailed and explain different calculation scenarios step-by-step but to...
The perpendicular force exerted by a surface on an object in contact with it
FRICTIONAL FORCE
The force that opposes motion of an object and acts parallel to the surface with which the
object is in contact
• The force opposes motion
• Acts parallel to the surface
• Acts opposite to the direction of movement
• It never causes movement
• Can never be greater than the applied force
, STATIC FRICTION VS KINETIC FRICTION
STATIC FRICTION KINETIC FRICTION
Frictional force that acts on an object Frictional force that acts on object that is
while it is at rest moving
• Varies from minimum to maximum • Object moves as the force of friction
• In the case of static friction, the has been overcome by the applied
applied force has not yet overcome force
the frictional force
𝐹𝑠 𝑚𝑎𝑥 = 𝜇𝑠 𝐹𝑁 𝐹𝑓𝑘 = 𝜇𝑘 𝐹𝑁
PUSH AND PULL APPLIED FORCES
• Push and pull forces are applied forces
• Push and pull forces act in opposite
directions to one another
• Push forces act on the object
• Pull forces act away from the object
FORCES APPLIED AT AN ANGLE
• Push and pull forces applied at an angle can be deduced into a vertical and
horizontal component
PUSH FORCE AT AN ANGLE PULL FORCE AT AN ANGLE
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