forces - floating or sinking

Question 1

why does water at bottom of container with holes in squirt further than hole at the top?

Answer 1

water at the bottom of the container is at a higher pressure than the water at the top as there is a greater weight of liquid acting downwards

Question 2

equation for calculating pressure of a column of liquid

Answer 2

pressure (Pa) = height of column (m) x density of liquid (kg/m3) x gravitational field strength (N/kg)
p=hpg

Question 3

how does pressure of liquid increase with density?

Answer 3

because liquids with a greater density have a greater weight acting downwards

Question 4

what does pressure of liquid depend on?

Answer 4

depth

Question 5

A object is submerged in water.
what experiences more pressure? what experiences less?
meaning?

Answer 5

bottom of object experiences a larger pressure than the top meaning there is a larger force acting in bottom than top

Question 6

what force is acting howard’s on object submerged in liquid?

Answer 6

resultant. called upthrust

Question 7

when does an object float?

Answer 7

• when an objects weight (downward force due to gravity) = the upthrust
• also if an object can displace its own weight of water then the upthrust will equal the objects weight making it float

Question 8

when does an object sink?

Answer 8

if upthrust is less than the objects weight

Question 9

why does water rise when object placed in it?

Answer 9

it has displaced the water

Question 10

what is the size of the upthrust acting on the object the same as?

Answer 10

the weight of water displaced by the object

Question 11

what does an object that’s less dense than water do?

Answer 11

displace small volume of water before the weight of water displaced equals the weight if the object.now upthrust equals the weight of the object + the object floats. it will float high

Question 12

what happens to object that is the same density as water?

Answer 12

it will have to displace its own volume of water in order for weight of water displaced to equal the weight of the object. upthrust equals weight of object and floats. however surface of object will be at the surface the water

Question 13

what happens to an object that has a higher density than water?

Answer 13

object cannot displace volume of water equal to its weight. this means weight of object is greater than upthrust so object sinks