# AS Physics Dynamics

What are the 4 Fundamental Forces?
1. Strong Nuclear 2. Weak Nuclear 3. Electromagnetic 4. Gravitational
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Define Strong Nuclear Force
Holds all protons and neutrons together in the nucleus
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Define Weak Nuclear Force
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Define Electromagentic Force
Responsible for attractive and repulsive forces between atoms e.g. air resistance, friction
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Define Gravitational Force
Gravity is the dominant force in the universe for shaping the large scale structure of galaxies and stars
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Define Gravity
Gravitational field strength is the force of gravity on a mass of 1kg
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What is Gravity measured in?
N kg-1 or N/kg
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Define Friction
The force exerted by a surface as an object moves across or makes an effort to move across that surface (friction opposes the motion of an object)
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Define Resultant Force
Overall/net effect of all the forces on an object
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What is Newton's 1st Law?
Every object at rest or continues in a straight line with constant velocity unless acted upon by a resultant force
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What is Newton's 2nd Law?
The acceleration of an object is directly proportional to resultant force acting on that object (F=ma)
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What is Newton's 3rd Law?
Every action has an equal and opposite action
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Define a Newton
A force of one newton gives a mass of 1kg an acceleration of 1 m/s2
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Define Terminal Velocity
It is achieved when there is no resultant force acting on a falling body
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## Other cards in this set

### Card 2

#### Front

Define Strong Nuclear Force

#### Back

Holds all protons and neutrons together in the nucleus

### Card 3

#### Front

Define Weak Nuclear Force

### Card 4

#### Front

Define Electromagentic Force

### Card 5

#### Front

Define Gravitational Force