Forces Flashcards
Kg =
Kilogram
m =
Metre, used in distance
m/s =
metre/second
m/s**2 =
metre/second (squared), used in acceleration
N =
Newton, used in force
s =
seconds, used in time
N/kg =
Newton/Kilogram, used in gravitational field strength
Nm =
Newton metre, used in torque
Kg m/s =
Kilogram m/s (momentum)
Different types of forces
Gravitational, weight, friction, electrostatic, air resistance (drag), tension (force in a spring), up thrust, lift, thrust
What is a vector quantity?
Vector quantities refer to the physical quantities characterized by the presence of both magnitude as well as direction
What is a scalar quantity?
Scalars are quantities that are fully described by a magnitude (or numerical value) alone.
Stopping distance is made up of…
thinking distance + breaking distance
What affects the stopping distance in a vehicle?
Speed, mass of the vehicle, road condition, reaction time
What is terminal velocity?
The speed that a falling object reaches when the resistance and acceleration balance out, so no more speed can be gained.
What happens when the forces on an object are balanced?
It will remain stationary, or it will move at the same speed in the same direction
What happens when the forces on an object are unbalanced?
It will either speed up, change shape or direction
What is Hooke’s Law?
Hooke’s Law states that force is directly proportional to extension
What is Netwon’s Third Law?
Every action has an EQUAL and OPPOSITE reaction
What is Elastic behaviour?
Elastic Behaviour is the ability of a material to recover to its original shape after the force is removed
