Matter review

What is mass?

• The amount of matter in an object

• The amount of space in an object

• The relationship between the space and the matter in an object

What do we use to measure volume?

• Digital scales

• A measuring cylinder

• Scales and weights

To find the density of an object, what do we need to know?

• The object's mass

• The object's mass and volume

• The object's mass and weight

Why does a cork float in water?

• Because the cork weighs less than water

• Because the cork has less volume than water

• Because the cork's density is lower than that of water

Gravity is...

• a force that acts at a distance

• a contact force.

• an effect of density.

When a force is applied to an elastic object,

the object…

• does not change shape.

• changes shape and then returns to its original shape

• changes shape but does not return to its original shape.

Speed is...

• how fast an object moves.

• the movement of an object.

• the diameter of an object.

What is an airship?

• an aircraft that has blades

• an aircraft filled with hydrogen or helium that has an engine

• a balloon filled with hot air

What does an aeroplane have to overcome in order to fly?

• Density

• Lift

• Its own weight

What is an aerodynamic shape?

• A shape that increases resistance to the wind

• A shape that increases resistance to the air

• A shape that reduces the amount of air friction over a moving object