Friction Force and Motion Quiz

What is friction fundamentally defined as in the video?

• A push or pull between objects
• A force that opposes motion when objects rub together
• A type of energy transfer
• A way objects move smoothly

Why do objects with rougher surfaces generate more friction?

• They are heavier
• Their bumpy surfaces catch on each other
• They have more color variations
• They are always made of rock

According to Newton's first law, what happens to an object in motion?

• It stops immediately
• It remains in motion unless acted upon by an outside force
• It accelerates randomly
• It disappears

Why do car tires have grooves called 'treads'?

• To make them look cool
• To increase friction between the tire and road
• To reduce weight
• To collect water

What practical example demonstrates friction generating heat?

• Rubbing hands together
• Sitting in a cold room
• Drinking hot chocolate
• Wearing gloves

When might we want to DECREASE friction?

• When walking
• When using playground slides
• When writing on paper
• When turning doorknobs

What substance might be added to an icy road to increase friction?

• Water
• Oil
• Sand
• Soap

Which surface would create MORE friction?

• Smooth glass
• Polished marble
• Rough concrete
• Slick ice

What mechanism do brakes use to stop a moving vehicle?

• Electrical signals
• Friction between brake pads and wheel
• Air pressure
• Magnetic forces

How might someone INCREASE friction when walking on ice?

• Wearing smooth-soled shoes
• Wearing shoes with metal spikes
• Wearing socks
• Walking very slowly