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A-Level Physics
Physical Science Final
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Physical Science
A-Level Physics
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105 Terms
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Acceleration
Vector showing how a speed changes
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Average Speed
total distance divided by total time
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Constant Speed
Speed that does not change
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Deceleration
A decrease in speed
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Displacement
Measure length from point A to B with direction
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distance
Measurement of how far you traveled
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Frame of Reference
System of objects not moving
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Instantaneous Speed
the speed of an object at one instant of time
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Motion
An object's change in position relative to a reference point.
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Speed
How fast you move; not a vector
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Velocity
Speed in a given direction
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Vector
a quantity that has both magnitude and direction
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Air Resistance
force that opposes the motion of objects that move through the air
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Balanced Force
two forces acting in opposite directions on an object, and equal in size
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Electric Force
The force between charged objects
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Electromagnetic Force
a force associated with charged particles, which has two aspects, electric force and magnetic force
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Fluid Friction
friction that occurs as an object moves through a fluid
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Force
A push or pull exerted on an object
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Friction
A force that opposes motion between two surfaces that are in contact
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Gravitational Force
the force of attraction between all masses in the universe
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Kinetic Friction
Energy of Motion
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Magnetic Force
the attraction or repulsion between magnetic poles
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Nuclear Force
an attractive force that acts between all nuclear particles that are extremely close together, such as protons and neutrons in a nucleus
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Projectile Motion
the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth
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Rolling Friction
friction that occurs when an object rolls over a surface
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Sliding Friction
friction that occurs when one solid surface slides over another
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Static Friction
Friction that acts on objects that are not moving
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Terminal Velocity
the greatest velocity a falling object reaches
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Unbalanced Force
Forces that produce a nonzero net force, which changes an object's motion
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Universal Force
immaterial creation by universal intelligence for the purpose of uniting intelligence & matter
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Action Force
the initial push or pull of one object on another object
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First Law of Motion
a body remains at rest or in motion with a constant velocity unless acted upon by an external force
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Inertia
the tendency of an object to resist any change in its motion
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Mass
the amount of matter in an object
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Momentum
The product of an object's mass and velocity
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Reaction Force
force acting in the opposite direction
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Second Law of Motion
Acceleration is produced when a force acts on a mass.
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Third Law of Motion
For every action there is an equal and opposite reaction
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Weight
A measure of the force of gravity on an object
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Compound Machine
a machine made of more than one simple machine
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Fulcrum
The fixed point around which a lever pivots
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Inclined Plane
a slanted surface along which a force moves an object to a different elevation
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Lever
A rigid bar that is free to move around a fixed point
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Machine
A device that makes work easier
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Mechanical Advantage
Ratio of the output force exerted by a machine to the input force applied to the machine.
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Power
the rate at which work is done
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Pulley
A simple machine that consists of a rope that fits into a groove in a wheel
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Screw
An inclined plane wrapped around a cylinder
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Simple Machine
a machine that does work with only one movement of the machine
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Wedge
V-shaped object with two inclined planes sloped toward each
other
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Wheel and Axle
Two different sized circular objects that are attached together and turn as one.
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Work
A result of a force moving an object a certain distance.
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Fixed Pulley
A wheel attached in a fixed location
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Movable Pulley
Attached to a load
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Pulley System
A combination of fixed and movable pulleys
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Block and Tackle
(Type of pulley system) Fixed pulley and a movable pulley are used together
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Chemical Energy
Energy stored in chemical bonds
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Electrical Energy
The energy of electric charges
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Electromagnetic Energy
A form of energy that travels through space in the form of waves
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Energy
the ability to do work
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Kinetic Energy
the energy an object has due to its motion
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Law of Conservation of Energy
the law that states that energy cannot be created or destroyed but can be changed from one form to another
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Mechanical Energy
The amount of work an object can do because of the object's kinetic and potential energies
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Nuclear Energy
Energy stored in the nucleus of an atom
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Potential Energy
stored energy
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Thermal Energy
The total energy of all the particles of an object.
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Absorption
the process or action by which one thing absorbs or is absorbed by another.
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Crest
Highest point of a wave
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Electromagnetic Spectrum
the complete range of electromagnetic waves placed in order of increasing frequency
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Gamma Ray
Electromagnetic waves with the shortest wavelengths and highest frequencies
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Infrared Wave
an electromagnetic wave that has a wavelength shorter than a microwave but longer than visible light
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Microwave
very short electromagnetic wave
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Opaque
impossible to see through; preventing the passage of light
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Polarization
A polarized light vibrates or oscillates in only one direction
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Radio Waves
Electromagnetic waves with the longest wavelengths and lowest frequencies
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Reflection
The bouncing back of a wave when it hits a surface through which it cannot pass.
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Refraction
The bending of a wave as it passes at an angle from one medium to another
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Scattering
reflection of light in all directions
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Translucent
allowing light to pass through, but blurring it so that images cannot be seen clearly
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Transmit
to send something across places; to pass along
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Transparent
Allowing light to pass through; easily recognized or understood; easily seen through or detected
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Trough
Lowest point of a wave
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Ultraviolet Light
Part of the electromagnetic spectrum that consists of waves with frequencies higher than those of visible light and lower than those of x-rays
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Visible Light
Electromagnetic radiation that can be seen with the unaided eye
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X-ray
A form of energy that travels in waves. X-rays have smaller wavelengths and therefore higher energy.
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Wave
A disturbance that transfers energy from place to place
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Wavelength
Horizontal distance between the crests or between the troughs of two adjacent waves
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Pseudoscience
A fake or false science that makes claims based on little or no scientific evidence.
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Law of Conservation of Momentum
The rule that in the absence of outside forces the total momentum of objects that interact does not change.
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Aristotle
Said force is required to keep an object moving
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Galileo
Said that without friction, an object would keep moving
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Newton
Defined force and mass as well as the three Laws of Motion
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6 Simple Machines
Lever, pulley, screw, wheel and axle, inclined plane, wedge
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What is the Mechanical Advantage of A Pulley?
More ropes
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What is the Mechanical Advantage of a Lever?
Longer input arm shorter output arm
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What is the Mechanical Advantage of a Wedge?
Thinner wedge
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What is the Mechanical Advantage of a Screw?
Closer threads
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What is the Mechanical Advantage of a Wheel and Axle?
Big wheel, small axle
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What is the Mechanical Advantage of a Inclined Plane?
Less steep
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First Class Lever (example)
Fulcrum in the middle (see-saw)
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