A-LEVEL Physics: 4.1.13: Friction (Seneca)

Question 1

What is ‘Friction’?

Answer 1

Friction is the Resistance to Motion Due to Contact Forces.

Question 2

Why do Object Usually Experience Friction?

Answer 2

Usually, an Object Experiences Friction Due to Collisions with Particles in the Air, or a Rough Surface of a Solid.

Question 3

Friction Always…
What does this mean?

Answer 3

Opposes Motion.
This means that it Slows Down Moving Objects.

Question 4

Friction Converts the Kinetic Energy of the Object into…

Answer 4

Other Energy Stores, Mainly Heat (Thermal).
(sometimes Sound Energy, etc…).

Question 5

What is ‘Drag’?

Answer 5

Drag is a Frictional Force. Objects that Travel Through a Liquid or Gas Experience Drag.
Drag is Due to Collisions Between the Travelling Object & the Particles in the Medium.

Question 6

Drag is a ___ Force.

Answer 6

Frictional.

Question 7

Objects that Travel Through a ___ or ___ Experience Drag.

Answer 7

Liquid, Gas.

Question 8

The Faster an Object Moves Through a Medium (Liquid or Gas), the ___ the Drag.

Answer 8

Larger.

Question 9

Drag is Also Affected by…

Answer 9

The Shape of the Object (how Streamlined it is).

Question 10

What is ‘Air Resistance’?

Answer 10

Air Resistance is a Type of Drag.
It is a Frictional Force which Opposes the Motion of an Object Travelling Through the Air.

Question 11

What is ‘Lift’?

Answer 11

Lift is an Upward Force Due to the Collisions with Air Particles on the Underside of the Object.

Question 12

Lift is a Result of Newton’s Third Law:

Answer 12

‘Every Action has an Equal & Opposite Reaction.’

Question 13

The Wing of a Plane Pushes Air Particles Downward as it Flies Forward. What happens as a Result of this?

Answer 13

As a Result of this Downward Force on the Air Particles, there is an Equal & Opposite Upward Force on the Wing: Lift.
This is the Basic Principle of how Aeroplanes Fly.

Question 14

Explain the Basic Principle of how Aeroplanes Fly: (2)

Answer 14

-As the Wing of the Plane Pushes Air Particles Downward, it Flies Forward.

-As a Result of this Downward Force on the Air Particles, there is an Equal & Opposite Upwards Force on the Wing: Lift.

(Application of Newton’s Third Law of Motion)

Question 15

Explain the Shape of a Plane Wing, and Why it is Shaped like this: (2)

Answer 15

-The Wing is Angled: Maximises the Amount of Air Particles it Can Push Downwards, thereby Generating the Maximum Upwards Force of Lift.

-The Wing is Smooth & Slightly Curved: Reduces the Drag Forces & Turbulence.