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# the physics language

### Vectors quantities, units of measurement, variable representation, mass vs weigh

If the unit of measurement is a Newton ,(N), what quantity does it represent? (give name & symbol) Force, symbol: F
If the unit of measurement is the kilogram, (kg), what quantity does it represent? (give name & symbol) mass, symbol: m
If the unit of measurement is meters per second squared, (m/s2), what quantity does it represent? (give name & symbol) acceleration, symbol: a
If the unit of measurement is the meter (m), what quantity does it represent? (give name & symbol) distance or displacement, symbol: d
If the unit of measurement is meters per second, (m/s), what quantity does it represent? (give name & symbol) speed or velocity, symbol: v
What two characteristics define a vector quantity? magnitude (size) and direction
Which is a vector quantity? (choose all that apply) a) acceleration b) speed c) velocity d) distance e) displacement f) weight g) mass a)acceleration, c)velocity, e)displacement, f)weight
In 1969, Neil Armstrong (wearing a spacesuit) had a mass of 163 kilograms. When Armstrong landed on the moon (g = 1.6 m/s2), what was his mass (w/spacesuit on)? a) 260.8 Newtons b) 260. 8 kilograms c) 163 kilograms d) 1599 Newtons c) 163 kilograms! explanation: his mass doesn't change on the moon! (but his weight is equal to 260.8 Newtons on moon, and 1599 Newtons on earth!)
Symbol: Ft tension force (measured in N)
symbol: Fg weight or force of gravity (measures in N)
symbol: m mass (measured in kg)
symbol: Fnet resultant force, net force, or unbalanced force (measured in N)
symbol: a acceleration
symbol: Fn normal force: the force exerted from a surface, perpendicular to the surface.
If a plane is flying overhead at constant altitude and a constant speed, how does the forward thrust force from the engines compare to the backward drag force? they are the same, since the plane is in equilibrium (it's moving at constant speed)
Created by: ccurlee