Forces Flashcards
What is a contact force
When and object is physically touching
Name some normal reaction forces
Friction
Air resistance
Tension
What is a non contact force
When a force is applied without physical touching
Examples of non contact forces
Magnetism
Electrostatic
Gravity
What is a scalar
A quantity that only has magnitude
What is a vector
A quantity that has magnitude and direction
How do you find the resultant vector
Using Pythagoras
Trig
The isn’t there a resultant force
When the forces are balanced
What is weight
The force that gravity pulls down on an object with
Weight =
N
Mass * gravitational field strength
Kg 9.8 n/kg
What is work done
Energy transferred by a force
Force times distance
Gravitational potential energy =
Mass time gravitational field strength times height
What happens when an object is stretched elastically
It returns to its original form
Force =
Spring constant times extension
What is the method for measuring a spring
Add masses to a spring to change force
Measure extension with a ruler
Plot a group f againced e
Gradient of graph is spring constant
Avoid systematic error by lining 0 up with the bottom of spring
What is a moment
A Turing force
What effects pressure under water
Weight of the Column of water above and object pushing down on it
