Friction and gravity

What happens to objects when they move through air?

• Objects gain speed as they move faster through air.

• Objects are unaffected by air when they are in motion.

• Objects experience air resistance, which opposes their motion.

• Objects become lighter when moving through air.

Why does a feather fall slower than a pencil?

• Both fall at the same speed in a vacuum.

• A pencil has a larger surface area than a feather.

• A feather falls slower than a pencil because of greater air resistance acting on the feather.

• A feather falls faster due to its lighter weight.

What is drag force?

• Drag force is the resistance force acting opposite to the relative motion of an object moving through a fluid.

• Drag force is the gravitational force acting on an object in free fall.

• Drag force is the force that propels an object forward in a fluid.

• Drag force is the force that increases with the speed of an object moving through a vacuum.

How does the size of an object affect drag?

• Only the shape of an object influences drag, not its size.

• Smaller objects experience greater drag due to less surface area.

• Larger objects experience greater drag due to increased surface area and fluid displacement.

• Drag is unaffected by the size of an object in fluid dynamics.

Why does water slow down a rock?

• Water has no effect on the rock.

• Water slows down a rock due to drag and resistance.

• Water makes the rock heavier.

• Water increases the rock's speed.

What is friction?

• Friction is the force that opposes the relative motion of two surfaces in contact.

• Friction is the temperature increase caused by two surfaces rubbing together.

• Friction is the force that enhances the motion of two surfaces in contact.

• Friction is the energy lost when two surfaces slide against each other.

Why is hiking on ice more dangerous than on a rough path?

• Hiking on ice is more dangerous due to reduced traction and hidden hazards.

• Rough paths have more obstacles than icy surfaces.

• Hiking on ice provides better grip than on rough paths.

• Ice hiking is safer because it is more predictable.

How does friction help you walk on a sidewalk?

• Friction helps you walk by providing grip between your shoes and the sidewalk.

• Friction is only important for running, not walking.

• Friction allows you to float above the sidewalk while walking.

• Friction makes your shoes slippery on the sidewalk.

What happens to friction when surfaces are pressed together more?

• Friction only depends on the material type, not the pressure.

• Friction increases when surfaces are pressed together more.

• Friction decreases when surfaces are pressed together more.

• Friction remains the same regardless of pressure on the surfaces.

Do heavier objects have more or less friction?

• Heavier objects have the same friction as lighter ones.

• Friction is independent of weight.

• Heavier objects have less friction.

• Heavier objects have more friction.