tension and upthrust

What happens if the weight of an object is equal to or less than the upthrust?

• It floats

• It sinks

• It spins

• It explodes!

What happens if the weight of an object is greater than the upthrust?

• it floats

• it sinks

• it bounces

• it vibrates

Objects A-D are in water. Which is the most dense?

• A
• B
• C
• D

What is the type of force in a rope when the rope is stretch by a weight?

• Tension

• Gravitational force.

• Upthrust.

• Thrust.

When a boat is float on a river,

• its weight is larger than its upthrust.

• its upthrust is larger than its weight.

• its upthrust is equal to its weight.

What is upthrust force?

• An upward force exerted by fluids on an object.

• An downward force exerted by fluids on an object.

Which liquid is the least dense?

• oil
• water
• syrup 
• plastic bottle

Why do boats float?

• The material they are made up of.
• Their volume gives them a large density.
• Their hollow shape leads to a low density.
• The number of passengers is not too high.

Tags

NGSS.MS-PS2-4

A helium balloon floats in air because

• there is more air than helium.
• helium is equally dense as air.
• helium is less dense than the air.
• helium is as dense as the air.

Identify on what factor upthrust depends on?

• Density of the liquid

• Density of the object

• mass of the object

• None