Floating and sinking

What are the two forces that affect you when you float??

• Frictional and gravitational forces

• Air resistance and tension forces

• Gravitational and upthrust forces

how do gravity and upthrust compare in size??

• They both are the same size

• gravity is bigger then upthrust

• upthrust is bigger then gravity

• I don't know

A man's weight is 400 N. what upthrust does he need to float??

• 500 upthrust

• 600 upthrust

• 400 upthrust

• 1 upthrust only

Look at the picture, why does some items float while some sink??

• because they don't want to float

• because some are heavy while some are not

• because some should stay in the water and some should breathe air

• because the density

choose the materials that can float on water (there are more then one)

• apples

• glass

• wood

• bottles

What is the density of water?

When does an object float on water??

• less density

• more density

• when the density is equal to the density of water

• when there is no density at all