Frictional force and Terminal Velocity Flashcards
If an object has no force propelling it, what will happen?
It will always slow down and stop because of friction
Friction always acts in the [ ] direction to movement
Opposite
To travel at a steady speed, the [ ] needs to [ ] the frictional forces
driving force
balance
When do you get friction?
Between two surfaces in contact or when an object passes through a fluid (drag)
What is drag?
Friction when an object passes through fluids (liquid or air)
Most of the resistive forces, in fluids are cause by [ ]
Air resistance
What is the most important factor in reducing drag in fluids?
Keeping the shape of the object streamlined
What is he best way of creating drag in a fluid?
A parachute
Drag increases as [ ] increases
speed
[ ] increases as speed increases in a fluid
Frictional forces
What do objects falling through fluids reach?
A terminal velocity
When falling objects first set off, the force of [ ] is [ ] than the frictional force slowing them down, so they [ ]
gravity
much more
accelerate
As the speed of the object falling increases …
What does this do?
…The friction builds up
This gradually reduces the acceleration until the frictional force is equal to the accelerating force and then it won’t accelerate any more = terminal velocity
What is terminal velocity?
The maximum speed of an object where the frictional force is equal to the gravitational force
What does the terminal velocity of a falling object depend on?
Shape and area
