Download - “DO NOW” FOR TUESDAY, FEBRUARY 4 TH
“DO NOW” FOR TUESDAY, FEBRUARY 4TH
WHAT TYPE OF FORCES ARE NECESSARY IN ORDER FOR AN OBJECT TO MOVE? THERE ARE TWO POSSIBLE ANSWERS.
“Do Now” for Thursday!
Draw a balanced and an unbalanced force.Illustrate the net force in each drawing.
Forces = Pushes & Pulls!
We know that the strength of a force is measured in SI units called Newtons…After Sir Isaac Newton. 1
Newton is equal to about 102 grams (0.22481 pounds).
Sir Isaac Newton
Net Force is the sum or difference of the forces on an object.
Net force = 300NGreen Team Wins!
What is a NON-ZERO FORCE?Same as an unbalanced force!
Non-zero = Unbalanced = Movement!
What is a ZERO FORCE?Same as a balanced force!Zero force = Balanced = NO Movement
Balanced?
Balanced?
Balanced?
So what is WORK??
Work is done when an object is moved in the direction in which a force is applied to
it.
Is There Work Without Motion?
NOPE!No Work Here!
Carrying your backpack to school might seem like work - but it’s not!
^^^FORCE
DIRECTION
The force must be in the direction the object moves!!!
Pushing, dragging or pulling your backpack = work!
FORMULA FOR WORK!
Work = Force X Distance(Newtons)
(Meters)
Work is calculated as the amount of force applied to an object times the distance the object moves. The term JOULE is used to describe a unit of work.
(Joule)
FYI – A 500N runner in the Empire State Building’s “Run-Up-Race” creates 160,000 joules of work while climbing the 1,576 steps. Enough
work to lift an elephant over 3 meters!
What is Power?
FORMULA FOR POWER!Power = Work OR Power = Force X Distance Time Time
Power is described in Joules/Second units called WATTS.
One joule of work done in one second = one watt of power.
A watt is a very small unit!Power is often measured in larger units such as Kilowatts (Kw) or Horsepower (hp).
1 Kilowatt = 1,000 watts1 Horsepower = 746 wattsThe average car has 110 – 150 hp.The average semi-truck has 200-400 hpA drag race car can have over 5,000 hpThe average horse has 22.5 hp.
Try some Equations!