Gr4 Science Lesson 2: Materials that Float and Sink

Which the following materials have the ability to sink in the water?

• metal spoon

• Styrofoam

• plastic cup

• rubber ball

Why do boats float in water?

• Boats are made of wood that make them float.

• The sea breeze makes the boat float in water.

• Man uses paddle to make the boat float in water.

• The water current pushes the boat upward.

_______ means the action of an object when it becomes submerged in a liquid or fall to the bottom of a liquid.

• float

• sink

• absorb

• repel

_______ means the action of an object when it sits on the surface of a liquid or stay on top.

• float

• sink

• absorb

• repel

______ is the ability of a material to float in liquid.

• Porosity

• Viscosity

• Malleability

• Buoyancy

Which the following materials have the ability to float on the water?

• large stone

• bowling ball

• pencil

• 10-peso coin

Which of the following affects a material's ability to float? Check ALL that applies.

• shape of the material

• type of liquid

• density of the material

• color of the material

________ is the degree of compactness of an object. It is how closely molecules are crowded together in a space.

• viscosity

• density

• porosity

• buoyancy

Objects with tightly packed molecules will sink if it is more dense than the liquid it is immersed in.

• True

• False

Objects with loosely packed molecules will sink if it is less dense than the liquid it is placed in.

• True

• False