Topic 5 - 2/2 Flashcards
Draw a velocity time graph of a constant acceleration, steady speed, increasing acceleration, constant deceleration
Draw on book
Draw a Distance time graph of steady speed, stop, accelerating and descelerating
Draw on book
Define Terminal Velocity
Maximum speed
Explain how a falling object will reach its terminal velocity (5marks)
When falling objects first fall, the force of gravity is much greater than the frictional force. As the speed of object increases, the the frictional force increases. This gradually reduces the acceleration of the object as the frictional force is equal to accelerating force so the resultant force is zero. Therefore it will have reached its max speed or terminal velocity
What does terminal velocity depend on
Shape and Area
How does air resistance affect terminal velocity
reduces terminal velocity ( max speed )
What is Newtons First Law
A resultant force is needed to make something move
What is Newtons Second Law
Acceleration is directly proportional to Resultant Force
What is the formula for force
Force = Mass x Acceleration
What is resultant force directly proportional to
acceleration
What is Inertia
Inertia is the tendency for motion to remain unchanged so until acted upon by a resultant force, objects will stay at rest
What does an objects inertial mass show
An objects Inertial mass shows how difficult it is to change the objects velocity
What is the formula for inertial mass
Mass = Force / Area
What is newtons Third law
When 2 objects interact, the forces they exert on each other are equal and opposite
Summarise the Light Gate Method
This method proves newtons 2nd law. attach a trolley with as piece of card on it and mark on the table the starting position. attach a string on the trolley that goes over a pulley connected to masses which you change. once the masses are attached, release thr trolley and the light gate will record the acceleration of the trolley when released. to investigate the effect on mass, attach masses on the trolley
