Understanding Friction and Drag Forces

What role does friction play when walking on a dry surface?

• It helps in maintaining grip.

• It makes walking difficult.

• It has no effect.

• It causes slipping.

Why is it important to reduce friction in machinery?

• To increase noise levels.

• To make the machine slower.

• To prevent parts from wearing down.

• To increase the weight of the machine.

What is the purpose of using lubricants like oil and grease in machines?

• To make machines heavier.

• To reduce friction.

• To change the color of the machine.

• To increase friction.

What is the term used for the resistive force experienced by an object moving through air?

• Surface tension

• Buoyancy

• Air resistance

• Water resistance

How does streamlining benefit fast-moving vehicles?

• It increases the weight of the vehicle.

• It increases fuel consumption.

• It reduces drag forces.

• It makes the vehicle slower.