Calculations Review Calculate the force An object has a mass of 30 kg It experiences an acceleration of 20 ms 2 Calculate acceleration A car slows with a braking force of 550 N The cars mass is 700 kg ID: 773806
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Calculations Review Calculate the force: An object has a mass of 30 kg. It experiences an acceleration of 2.0 m/s 2 . Calculate acceleration : A car slows with a braking force of -550 N. The car’s mass is 700 kg. Calculate mass : The car accelerates by 1.2 m/s 2 . The force of the engine is 800 N.
Balanced Forces Unbalanced Forces
A state of balanced forces cause objects to maintain a constant velocity. Forces are equal in magnitude and opposite in direction. All forces acting upon the object cancel out. Net force = ZERO
What is the effect of balanced forces ? (Remember Newton’s 1 st Law of Motion).The object will maintain a constant velocity. It will not get faster. It will not get slower. It will not change direction.
The cyclist will move with a constant velocity of 10 m/s because the forward force moving the bicycle is equal and opposite the resisting force of friction. Balanced forces acting upon a moving object will maintain the constant velocity . Constant velocity of 10 m/s Will not speed up Will not slow down
The man will remain motionless (constant velocity = 0 m/s) at the surface of the water because the force of gravity pulling down is equal and opposite to the buoyant force of the water pushing up. Balanced forces.
Static Equilibrium The condition where an object that is already motionless remains motionless when acted upon by balanced forces.
A state of unbalanced forces cause objects to accelerate and change their motions. Forces are NOT equal in magnitude and opposite in direction. A net force will act upon the object when force vectors are added. Net force > 0
What is the effect of unbalanced forces ? (Remember Newton’s 1 st Law of Motion).The object will accelerate with an unbalanced external net force. It will get faster. It will get slower. It will change direction.
Wagon will accelerate to the right (direction of greater force). Net force = 40 N. Tug-o-war teams will accelerate to the right (direction of greater force) Net force = 2 N.
Unbalanced Forces. Engine F > - Friction F Balanced Forces Engine F = -Friction F Unbalanced Forces Engine F < - Friction F
Applied Forces Applied forces (action forces) are all of the outside or external forces that act upon an object at the same time. Applied forces are the pushes and pulls acting on the object. Net Force The net force is the ONE FORCE that remains after all of the applied or action forces acting upon the object are added together and cancel out. Forces are vectors, they can be added together.
Balanced Forces Net force = 0 N No acceleration. Unbalanced Forces Net force = -100 N Acceleration to the left. Unbalanced Forces Net force = + 40 N Acceleration to the right.
F = -500 N v = 20 m/s F = +500 N Identify if the forces are balanced or unbalanced. Calculate the net force affecting the car. Will the car’s velocity increase, decrease, or remain constant? Why?
F = -400 N v = 20 m/s F = +500 N Identify if the forces are balanced or unbalanced. Calculate the net force affecting the car. Will the car’s velocity increase, decrease, or remain constant?
F = -400 N v = 0 m/s F = +500 N Identify if the forces are balanced or unbalanced. Calculate the net force affecting the car. Will the car’s velocity increase, decrease, or remain constant?
F = -500 N v = 25 m/s F = +400 N Identify if the forces are balanced or unbalanced. Calculate the net force affecting the car. Will the car’s velocity increase, decrease, or remain constant?
Concept Review What is mass? How do you calculate force? What do forces cause? What are balanced forces? What are unbalanced forces? What happens to the motion of an object when forces are balanced? What happens to the motion of an object when forces are unbalanced?