Science Revision

What is work?

• The transfer of energy when a force is applied to move an object over in an object.

• The ability to cause movement

• to pull of gravity on an object's mass

How can the direction and size of a force be represented?

• By a number

• By a circle

• By an arrow

How does air resistance affect the falling speed of objects?

• It decreases their falling speed

• It increases their falling speed

• It changes the direction of their fall

In Which direction does friction typically work?

• In the direction opposite to the object's motion

• Friction does not have a specific direction

• In the same direction as the object's motion

What happens to a stationary object when the forces acting on it are balanced?

• It moves

• It disappears

• It remains stationary

Does pure water conduct electricity?

• Yes

• No

What type of water is more likely to conduct electricity?

• tap water

• saltwater

• rainwater

Why does distilled water usually not conduct electricity well?

• It lacks Ions

• It is too cold

• It is too hot

What is the main factor that influences water's ability to conduct electricity?

• Tempertaure

• Density

• smell

Which substance is added to water to make it a better conductor of electricity?

• salt

• sugar

• vinegar