Force and Friction

What is friction?

• Friction is the force that accelerates motion.

• Friction is the force that attracts objects.

• Friction is the force that causes objects to float.

• Friction is the force that resists motion.

Name the two types of friction.

• dynamic friction and rolling friction

• sliding friction and rolling friction

• fluid friction and air friction

• static friction and kinetic friction

Which type of friction occurs when an object moves through a fluid?

• Static friction

• Rolling friction

• Fluid friction or drag

• Kinetic friction

Which type of friction occurs when an object is at rest?

• Dynamic friction

• Kinetic friction

• Static friction

• Sliding friction

What is static friction?

• Static friction is the force that resists the initiation of sliding motion between two surfaces that are in contact and at rest relative to each other.

• Static friction is the force that causes objects to move smoothly without resistance.

• Static friction is the force that increases as objects move faster.

• Static friction is only present in liquids and gases, not solids.

What is kinetic friction?

• Kinetic friction is the force that increases the speed of objects in motion.

• Kinetic friction is the force that helps objects move smoothly without resistance.

• Kinetic friction is the force that opposes the relative motion or attempts of motion between two surfaces in contact when they are moving past each other.

• Kinetic friction is the force that causes objects to attract each other.

How does friction affect the motion of an object?

• Friction opposes the motion of an object by acting in the opposite direction.

• Friction has no effect on the motion of an object

• Friction accelerates the motion of an object

• Friction changes the color of an object

Give an example of rolling friction.

• A ball rolling on grass

• A bike on a sidewalk

• A skateboard on a ramp

• A car moving on a road

Explain the concept of fluid friction.

• Fluid friction is the energy lost by a fluid due to its viscosity.

• Fluid friction is the resistance to an object's motion through a fluid.

• Fluid friction is the force exerted by a fluid on an object at rest.

• Fluid friction is the attraction between two objects submerged in a fluid.

How can friction be reduced?

• Increasing friction, using rough surfaces, applying more pressure

• Using lubricants, polishing surfaces, or using ball bearings