General Knowledge

Which force is applied when brakes are used to stop a car?

• Stopping force

• Frictional force

• Gravitational force

• Air resistance

How can a person reduce the friction on a surface?

The friction on a surface can be reduced by ______

• Making the surface rough

• Making the surface uneven

• Making the surface lubricated

• Making the surface steeper

What kind of force is an upthrust force?

• Pushing force

• Stopping force

• Frictional force

• Pulling force

A boy observed a woman trying to push a rock along a road. Though the woman was sweating heavily and she was pushing with all her might, the rock was not moving.

Which is a LIKELY reason for the rock not moving?

• Gravity was pulling on the rock

• There was friction between the woman's hand and the rock

• No work was being done by the rock

• No work was being done by the woman's pushing force

Which energy source is correctly matched with its energy form?

• Wind energy---Chemical energy

• Solar energy---Heat energy

• Wave energy---Heat energy

• Hydroelectric energy--- Chemical energy

Which statement is true about the flow of heat energy?

Heat energy _____

• does not flow, objects have their own heat

• flows, but only when there is no difference in temperature

• flows, bbut from a cold location to a warm location

• flows, but from a warm location to a cold location

In which situation would a conductor be useful?

It would be useful when____

• someone wants to quickly boil a pot of water

• someone want to remain warm on a cold night

• someone want to keep water warm for a long time

• someone is holding a hot cup of soup in their hand

A student wanted to tell her classmates what energy is. what would you recommend she tell her classmates?

Energy is_____

• what is needed to move a desk forward

• what you see when a sandwich rests on a table

• when gravity causes a ball to fall to the ground

• the pressure you feel when you press your hand on a wall

Which provides a reason for energy conservation?

Conserving energy____

• increases the need to open windows so as to cool rooms down

• decreases global temperatures as more trees are available to make shade

• saves wild life habitat as only old trees are removed

• reduces carbon dioxide in the atmosphere as fossil fuel is used more wisely

Which nutrient is the MAIN energy source for the human body?

• staples

• proteins

• fats

• carbohydrates