AS Physics Dynamics 0.0 / 5 ? PhysicsDynamicsASAQA Created by: AmyeFarmerCreated on: 13-06-18 10:30 What are the 4 Fundamental Forces? 1. Strong Nuclear 2. Weak Nuclear 3. Electromagnetic 4. Gravitational 1 of 14 Define Strong Nuclear Force Holds all protons and neutrons together in the nucleus 2 of 14 Define Weak Nuclear Force Involved in radioactive decay 3 of 14 Define Electromagentic Force Responsible for attractive and repulsive forces between atoms e.g. air resistance, friction 4 of 14 Define Gravitational Force Gravity is the dominant force in the universe for shaping the large scale structure of galaxies and stars 5 of 14 Define Gravity Gravitational field strength is the force of gravity on a mass of 1kg 6 of 14 What is Gravity measured in? N kg-1 or N/kg 7 of 14 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) 8 of 14 Define Resultant Force Overall/net effect of all the forces on an object 9 of 14 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 10 of 14 What is Newton's 2nd Law? The acceleration of an object is directly proportional to resultant force acting on that object (F=ma) 11 of 14 What is Newton's 3rd Law? Every action has an equal and opposite action 12 of 14 Define a Newton A force of one newton gives a mass of 1kg an acceleration of 1 m/s2 13 of 14 Define Terminal Velocity It is achieved when there is no resultant force acting on a falling body 14 of 14
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