Buoyancy - Do Now #7

Do Now # 7
When does the volume of the displaced water = the volume of the object?
When does the mass of the displaced water = the mass of the object?






If an object has a density of 1.1 g/mL what will it do when placed in water?


Why do we float better in salt water?



What is the density of helium compared to the density of atmosphere at sea level? How do you know?



What happens to an ocean liner when all the people get on board?


If an object has a mass of 25 grams and when placed in water floats by only being exactally 1/2 submerged what is the volume of the object and what is the density of the object? What is the buoyant force.



If an object has a volume of 300 cubic centimeters and sinks completely what do you know about its mass?  What do you know about the buoyant force?



Better Understanding Buoyant Force.  What is a force?




In physics, a force is any influence that causes a object to undergo a change in speed, a change in direction, or a change in shape. Force can also be described by intuitive concepts such as a push or pull that can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. A force has both magnitude and direction, making it a vector quantity. Newton's second law, F=ma, was originally formulated in slightly different, but equivalent terms: the original version states that the net force acting upon an object is equal to the rate at which its momentum changes.^[1]


F=MA
Mass time acceleration due to gravity.....


weight is the name given to the force on an object due to gravity.  thus:


Weight  = mg.


An object with a mass of one kilogram has a weight 9.8 newtons on the surface of the Earth, about one-sixth as much on the Moon, and very nearly zero when in deep space far away from all bodies imparting gravitational influence.