Test 1- Forces, Weight, Springs and Elasticity and Hooke's Law Flashcards
Drag
The force that acts against an object moving through fluid (like friction for fluids)
Friction
The force that acts against an object sliding across a surface
Tension
The force in a string holding up a picture
Weight
The force acting on an object due to gravity
Lift
The force on the wings of an aircraft
Contact Force
The force that a solid exerts against an object
Thrust
The propulsive force from an engine
Electrostatic
The force between charged particles
Magnetic
The force between a magnet and an iron nail
W=mg
Weight= Mass x Gravitational field strength
A force
A push or pull on an object caused by it interacting with another object
What can happen when an object experiences a force
It could change speed (accelerate) or change shape (deform)
Contact forces
Objects have to be touching
Non-Contact forces
Objects do not have to be touching
What is that special random note about Normal Contact force?
Normal Contact force is perpendicular to a surface
W=mg
Weight (N) = Mass (kg) x Gravitational Field Strength (N/kg)
Gravitational Field Strength of Earth
9.8 N/kg
What are the 3 possible results of exerting force on a spring?
Stretch, Compress and Bend
How to calculate extension of a spring
New length - Original length
Elastically deformed object
If an object goes back to its original shape and length when the force is removed
Inelastically deformed object
If an object doesn’t go back to its original shape and length when the force is removed
Hooke’s Law
The extension of an object that obeys Hooke’s Law is directly proportional to the force supplied
Direct proportionality
Whatever % change to force you would get same % change to extension
Directly proportional symbol
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