What is force? FORCE = A push or pull that changes an object’s velocity A change in velocity = acceleration As a result, forces can cause objects to speed up, slow down, or change direction
What are the units for force? UNIT: Newton (N) Measurement Unit Distance Meters (m) Time Seconds (s) Velocity m/s Acceleration m/s2 Force Newton (N)
What is Net Force? Usually more than one force is acting on an object NET FORCE = combination of all the forces acting on an object
What are Balanced Forces? Forces are balanced when the net force = 0 Equal forces going in opposite directions NO ACCELERATION Object is said to be in equilibrium
What are Unbalanced Forces? Forces are unbalanced when net force ≠ 0 One force is greater than another Acceleration occurs
Quick Checks What is net force? What is true about net force when all the forces acting on an object are balanced? What does this mean for the motion of the object? What is true about net force when all the forces acting on an object are unbalanced?
Equilibrium Video https://www.youtube.com/watch?v=t0akAKlJ3nc
Video Qs What is tension? (force in stretched rope) What is the equilibrium rule? (∑F=0 if the system doesn’t change its state of motion) ∑ - sigma – sum of What would happen to the tension in Burl’s rope if Burl and Hewitt were both on Burl’s side? (Burl’s rope would have ALL the tension – the force would increase)