Friction

Friction can be reduced by using

• Lubricants or smoother surfaces
• Higher temperatures
• Rough surfaces
• Increased weight

Which of the following materials is commonly used as a lubricant to reduce friction?

• Oil

• Sand

• Wood

• Plastic

What effect does increasing the surface area of contact have on friction?

• Increases friction

• Decreases friction

• No effect

• Depends on the material

Which of the following scenarios would likely result in the highest friction?

• Sliding a book on a table

• Pushing a car on a smooth road

• Rolling a ball on grass

• Dragging a heavy box on a carpet

The shape of an aeroplane is like a

• tree
• car
• bird
• fish

What is the primary purpose of an airplane's wings?

• To provide lift

• To reduce weight

• To increase speed

• To enhance stability

Which of the following factors does NOT affect friction?

• Surface texture

• Weight of the object

• Color of the object

• Material of the surfaces

What happens to friction when a surface is lubricated?

• It increases

• It decreases

• It remains the same

• It becomes unpredictable

How does increasing the weight of an object affect friction?

• Increases friction

• Decreases friction

• No effect

• Depends on the surface

Which of the following is a common effect of friction on moving objects?

• Heat generation

• Increased speed

• Decreased weight

• Change in color