Terminal velocity Flashcards
If an object has no force propelling it along what will happen and why?
- always slow down and stop because of friction
Which direction does friction always act?
Opposite direction to movement
To travel at steady speed , What forces need to balance out?
- driving force, frictional force
How do you get and reduce friction
- You get friction between two force in contact or when an object passes through liquid (drag)
- You can reduce friction between surfaces using a lubricant
What is drag and state an example?
What’s the most important factor in reducing drag
When do frictional forces from the liquid increase?
1) Resistance you get in a fluid , Air resistance is a type of drag.
2) Keeping shape of object streamlined
- this is where the object is designed to allow the fluid to flow easily across it, reducing drag, (parachutes work in opposite way = get as much drag)
3) with speed, ( car has more frictional forces to work against when travelling at 70mph then 30mph) (Engine works harder to maintain steady speed)
Steps when a falling object first sets off ( parachute )
Force of gravity greater than frictional forces slowing it down = it accelerates.
speed increase = friction builds up
This gradually reduces acceleration until frictional forces is equal to accelerating force
It will have reached max speed or terminal velocity and fall at steady speed
The less streamlined an object is ,,,
The lower the terminal velocity
object w large SA = lower terminal velocity
For example, if you dropped a marble and a beach ball
marble = terminal velocity higher than beach ball because more air resistance on beach ball at any given speed so beach ball spends less time accelerating
What’s a terminal velocity?
Terminal velocity is the maximum velocity that an object can attain when it is falling through a fluid, such as air or water.
