Contact Forces
This is a pulling force only
Tension
The earths gravitational constant is equal to this value
10 N/kg
the change in length of a loaded spring is called
extension
Increasing the area where a force is applied does this to the pressure
decreases
Si unit of mass
kilogram
kg
This force always acts perpendicular to the surface
Normal Reaction
This force always acts down
Gravitational force / Weight
Hookes law states that these two are directly proportional
force and extension
The Si unit of pressure is this
Pascal
SI unit of Force
Newton
N
This force slows a a moving object down
friction
To find the weight of an object on the moon you must do this
Divide the weight on the earth by 6
this value is unique for every spring
spring constant
the ratio of force per unit area
pressure
Formula to calculate Weight on the earth
Weight = Mass x gravity
W = m x g
This is an objects ability to return to its position after a displacement
stability
This is the point on an object where its entire weight seems to act
center of gravity
The extension of an unloaded spring is always
zero
A 100 N bulldog sits on a chair whose seat has an area of 5 square meters. What is the pressure exerted on the chair?
20 Pascals
Formula to Calculate pressure
Pressure = Force / Area
The weight of an object immersed in a fluid is called the ...
apparent weight
These two forces exhibit attraction and repulsion
magnetic and electric
If a spring has a total length of 10 cm and an extension of 7 m, what was its original length?
3 m
A 20 N cube exerts what pressure on a square tile of sides 2 meters?
5 Pascals
SI unit for "spring constant"
Newtons per meter
N/m