Floating and Sinking Keywords Quiz - G8

What is buoyancy?

• The ability of an object to float in a fluid

• The process of measuring the mass of an object

• The force pulling objects toward Earth

• The downward force acting on an object

What does density refer to?

• The volume of a fluid

• The amount of space an object occupies

• The mass of an object divided by its volume

• The amount of pressure exerted by a liquid

Which of the following defines upthrust?

• The force that pushes objects toward Earth

• The upward force exerted by a fluid on a submerged object

• The pressure applied to a surface

• The change in an object’s velocity over time

What is a hypothesis?

• A set of conclusions drawn from experiments

• An explanation based on observations that is not testable

• A proposed explanation for a phenomenon that can be tested

• A mathematical formula for gravity

What are balanced forces?

• Forces that cause an object to accelerate

• Forces that are equal in size but opposite in direction

• Forces that cause objects to sink

• Forces acting on objects in motion

When do unbalanced forces occur?

• When forces acting on an object are equal

• When the object's motion does not change

• When one force is greater than the other

• When an object is in free fall

What does submerged mean?

• Floating on the surface of a fluid

• Completely under the surface of a fluid

• Halfway submerged in a fluid

• Suspended in the air

In an experiment, what is a variable?

• The outcome that is measured

• A factor that can change

• A set of instructions for an experiment

• A fixed value that does not change

Which of the following best describes pressure?

• The upward force exerted by a fluid

• The force applied perpendicular to a surface per unit area

• The density of a fluid

• The force of gravity on an object

What are weather balloons used for?

• To measure the density of water

• To gather data about atmospheric conditions

• To measure the mass of objects in space

• To test the effects of balanced forces