What is mass of an object?
Quantity of matter in it
What happens if object falls freely?
Resultant force acting on it is force of gravity
What will happen to object falling freely
when resultant force acting on it is gravity
Force will make object accelerate about 10 (m/s)2
towards Earth's surface
What is an object's weight?
Force of gravity that acts on object
What is acceleration due to gravity?
Acceleration , which object experiences due to gravity
force acting on an object is its weight
W = mg
W = weight , N
g = acceleration due to gravity - m/s2
m = mass , kg
What is gravitational field strength?
Gravitational force on a 1kg object at a place where the object is
What is units of gravitational field strength?
Newtons per kilogram
What happens when object falls through a fluid
(like liquid or gas)?
Fluid exerts a drag force on the object
resisting its motion
What happens the faster the object falls through fluid?
Bigger the drag force becomes
until it becomes eventually equal to weight of object
What happens after object falls through fluid?
resultant force = 0
Object stops accelerating
moves at constant velocity - terminal velocity
What happens when object falling through the air?
Drag force is called air resistance