Quiz 4 Flashcards
State the equation linking weight,mass and gravitational field strength
W=mg
Forces are always interactions between how many objects?
2
State 3 example of contact-forcss
Tension
Friction
Air resistance
What is an electrostatic force?
The force exerted between charged objects
What 3 changes can forces cause?
Change of speed,change of direction, change of shapd
State the equation linking force,spring constant and extension
F=ke
State the unit of mass
Kg
State the unit of weight
Newton
When an object is lifted,work is done against….?
Gravity
Define scalar quantity
A quantity with magnitude and no direction
Beyond which point does Hookes law not apply?
The limit of proportionality
Define a vector quantity
A quantity with magnitude and direction
What is air resistance?
The force which acts against motion when an object moves through air
What measuring instrument is used to measure mass?
Mass balance
What is friction?
The force which acts against motion when 2 surfaces run against each other
Which is the same wherever an object goes in the universe? Weight or mass?
Mass
What is water resistance?
The force which against motion when an object moves through water
What is lift?
The force which acts upwards on an object with wings
What store of energy is stored in an object when it is deformed elasically?
Elastic potential energy
What is the spring constant measured in?
N/m
What are forces measured in
Newtons or N
What is extension measured in?
meters or M
What is the equation that links force,extension and spring constant in words
Force= spring constant x extension
What is the equation linking elastic potential energy,extension and spring constant
Ee= 0.5x k x e squared
