P2.2 Motion Laws Flashcards
Contact force and examples
Two objects must be touching to exert a force
- friction
- air resistance
Forces can be…
Contact and non-contact
Non-contact forces and examples
Forces between two objects that aren’t touching
- gravity
- magnetism
What is a resultant force?
A resultant force is when a number of forces act at a single point so you can replace them with a single force
Newton’s First Law of Motion (inertia)
An object will remain stationary or at a constant velocity unless acted upon by an external force
Newton’s Second Law of Motion Equation
F=mA
Force = mass x acceleration
Newton’s Second Law of Motion
Acceleration of an object is directly proportional to the resultant force exerted on it and inversely proportional to its mass
Newton’s Third Law of Motion
For every action, there exists an equal and opposite reaction
Inertia
The ability of a body to resist acceleration
Types of energy
thermal
light
sound
kinetic
electric
chemical
gravitational potential
elastic potential
nuclear
Law of conservation of energy
Energy cannot be created or destroyed, only transferred
What is GPE?
depends on height above earth’s surface and mass
GPE (J) equation
mass (kg) x gravity (N/kg) x height (m)
Kinetic energy (J) equation
1/2 x mass x velocity^2 (m/s)
Momentum
The larger the mass or greater the velocity, the more momentum an object has
