Parachutes
What forces act on a falling parachute?
gravity and air resistance
Name 3 simple machines
lever, inclined plane (ramp), wedge, pully, wheel and axle, screw
Why do we do refinements?
What is a force?
A force is something that pushes, pulls or twists
How did we extend the parachute prac?
We added 2 more sizes to parachutes to have a total of 3 sizes.
This was to see the trend and relationship between surface area and air resistance
What is the benefit of simple machines?
They make work easier to do.
Basic mechanical device used for applying force
What is the difference between a refinement and extension?
A refinement is changing something already there where an extension is adding something to the method.
What is the difference between a contact and a non-contact force?
A contact force has direct contact with an opject where a non-contact force does not
How does the surface area of a parachute impact on the time taken for a mass to fall?
As the surface area increases, so does air resistance. The greater the air resistance the longer the fall time.
Give an example of each type of lever
Seasaw - 1st class
wheelbarrow - 2nd class
chopsticks - 3rd class
Identify the relationship in this graph
Positive linear
What is the total net force with 200N of upwards thrust and 50N of gravity?
150N Upwards
What is Terminal Velocity?
Terminal velocity is when a falling object is falling at a constant speed because the forces acting on it are balanced.
What is the ramp mechanical advantage formula
mechanical advantage = length of ramp over height
There are two types of error in an experiment, what are they?
Systematic error and random error
BONUS POINTS!!!
can you give an example of each type of error
What is the difference between mass and weight?
The mass is the volume of an object where the weight is the objects relationship with gravity