CH 2 Main Test Flashcards
What Unit do we use to Measure Weight? & Force is applied by?
To Measure Weight and apply force we use Newtons (N)
What is the Force “Newton” named after?
The Force Newton is named after Sir Isaac Newton; an english physicist who developed many of our current ideas about Force and Motion
What Does the Head of the Arrow indicate?
The head of the arrow indicates direction
What does 1 Joule equal
1 Joule equals 1 Newton-metre (N-M)
What does 1 Newton-metre equal?
1 Newton-metre equals 1 Joule (J)
What does the Length\Thickness of the
Arrow Indicate?
the length or thickness of the arrow indicates the magnitude.
What is the Formula for MA (Distance)
MA= Input Distance
——————
Output Distance
What is the formula for MA (Length)
MA= Effort Arm Length
————————
Load Arm Length
What are 2 common lubricants?
Ski wax and engine oil are two common lubricants.
What is Energy often defined as?
Energy is often defined as the ability to do work.
What is the Formula for Work?
W= FxD
What is the formula for Actual MA
Actual MA= Measured Output Force
———————————
Measured Input Force
One thousand Joules (J) is equal to how many kilojoules (KJ)?
One thousand joules (J) is equal to one kilojoule (KJ)
(1000 J= 1 KJ).
One Kilojoule (kj) is equal to how many joules (J) ?
One kilojoule (kj) is equal to one thousand joules (J)
(1 kJ = 1000 J).
When is Work done?
Work is done only when a force applied to an object causes the object to move a distance parallel to the force.
How can energy be consumed when no work is done?
you use energy to apply forces on things to make them move. not all of the energy consumed is turned into useful work. Energy was consumed applying the force even when there was no work done.
Ex: When you tried to move the rock, you consumed energy, but the rock did not move. Energy was used as your muscles contracted while pushing on the rock. Your heart pumped more blood and your chest muscles moved air in and out of your lungs as you applied more force. In other words, work was done on your internal organs, but not on the rock.
W= F x _ How do you find Distance?
D= W
—
F
W= _ x D How do you find Force?
F= W
—
D
What is the units used for work?
Newtons (N), Joules (J)
What is the 6 Simple Machines?
wedge, screw, lever, pulley, inclined plane and the wheel and axle.
