14. Friction & Air Resistance

Success Criteria

Your learning has been successful if you can do the following:


Learn these so you can communicate this concept well.

Lesson 14: Hei Mahi (Do Now)

Do Now: on Pg 43 of your SciPAD (find a space!)

Give some examples of friction from a solid, a liquid and a gas.

Lesson 4: Exit Task

Find some space on page 15 of your PESS1.2 SciPAD,
and answer the following questions:

What does each letter in CUTLASS stand for? 


Friction is the force that opposes the motion of an object when it comes into contact with another object or surface. 

It occurs due to irregularities in the surfaces of objects, causing resistance when they slide or move past each other. 

Friction is everywhere in our everyday lives, influencing various activities and processes.

Types of Friction

There are different types of friction:

Static Friction

This type of friction occurs when two surfaces are stationary relative to each other. It prevents an object from moving when force is applied, until the force overcomes the static frictional force, initiating motion.

Kinetic / sliding Friction

Kinetic friction arises when two surfaces are in motion relative to each other. It opposes the direction of motion, acting to slow down or stop the movement.

Rolling Friction

Rolling friction is experienced when an object rolls over a surface. It is generally less than sliding friction, making it easier for objects like wheels to roll.

Fluid friction also known as fluid resistance or drag

This is a type of friction that occurs when an object moves through a fluid such as air or water. Unlike solid friction, which occurs between solid surfaces, fluid friction arises due to the interaction between the moving object and the molecules within the fluid.

Factors Affecting Friction

There are three factors that affect friction: 

Air Resistance

Air resistance, also known as drag, is the force exerted by air molecules on objects moving through the air. It opposes the motion of the object, affecting its speed and trajectory. Air resistance becomes particularly significant at higher speeds or for objects with large surface areas.

There are several factors affecting air resistance:

Tasks & Homework

Task 1: PESS1.2 SciPAD

Page 14 - Calculating Speed from a Distance-Time Graph

Page 15 - New Zealand Secondary Schools Rally Team


Access your own copy of this homework task on Microsoft Teams. 

Homework - 9. Converting V-T to D-T Graphs