Topic 5 - Forces Flashcards
What are fluids?
substances that can flow
particles are able to move around
The pressure of a fluid means
force is exerted at right angles to any surface in contact with the fluid
Formula for pressure
pressure (pascals) = force (newtons)/area(m^2)
F=M/A
The more dense a liquid is the pressure is…
higher as there are more particles in a a given space
Relationship between depth and pressure
As depth increases the pressure increases as there are more particles above
Area under a velocity-time graph represents
Distance travelled
Newton’s 1st law
Resultant force on a stationary object is 0 the object will be stationary
Resultant force on a moving object is 0 it will carry on moving at the same velocity (speed and direction)
Newton’s 2nd law
F=ma
force(newtons)=mass (kg) x acceleration (m/s^)
The larger the resultant force acting on an object
the more the object accelerates
Difference in acceleration between a large and a small object
large object accelerates less than the smaller one
Inertia is
the tendency for motion to remain unchanged
inertial mass measures
how difficult it is to change the velocity of an object
Newton’s 3rd law
When 2 objects interact the forces they exert on each other are equal and opposite
Acceleration is the
change in velocity in a given time
Formula for acceleration
acceleration(m/s^2) = change in velocity(m/s) / time taken(s)
