Unit 2a forces and motion Flashcards
What is the difference between distance and displacement?
Distance just measures how far something is whereas displacement measure how far and which direction.
What is the difference between speed and velocity?
Both measure how fast something is going however velocity also measures the direction
What is a scalar quantity and vector quantity?
S= Speed, distance, mass, time
V= velocity, displacement, force
What is the difference between weight and mass?
Mass if just the amount of particles in a thing that makes it dense, whereas weight is the amount of gravity acting upon it.
What is newtons first law?
An object will remain at rest or in uniform motion unless acted upon by an external force
What is newtons second law?
A non-zero resultant causes an acceleration (resultant force = mass x acceleration)
What is a drag?
object passes through a fluid or gas, for example air resistance
How to reduce drag?
Making an object streamlined
What is inertia?
Measure of how difficult it is to change an objects velocity. Therefore, the larger the mass the larger the inertia.
What is newtons third law?
If body A exerts a force on body B, then body B will exert an equal and opposite force on body A
What is Work Done?
When an object is moved by a force, energy is transferred and therefore work is done
What is the limit of proportionality?
Extension is no longer proportional to force
What makes cars lose energy?
Idling losses
Aerodynamic drag
Rolling resistance
inertial losses
Why is stopping in short distances dangerous?
work is done to transfer the kinetic energy to any other energy type, but over a shorter distance the energy will be transferred very quickly meaning there will be a greater force, putting a higher risk on people
