physics

• The law of universal gravitation states that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
• Weight (W) = mass x g
• Gravitational field strength (g) = mass/distance^2
• Work done = force x distance moved in direction of force
• Energy can be transferred from one object to another by work done, heating or electrical current.
• Newton's first law of motion - an object at rest stays at rest, an object moving at constant velocity continues to move at constant velocity unless acted upon by a net external force
• The SI unit of energy is the joule (J).
• Gravitational field strength (g) = acceleration due to gravity
• Force (F) = mass x acceleration
• Newton's second law of motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
• Energy stored in an elastic object = 1/2 kx^2
• Potential energy = mgh
• A potential difference between two points causes charge carriers to flow through a circuit.
• Resultant force = sum of all forces acting on an object
• Potential difference (V) = change in electric potential / Coulomb per second
• Current (I) = coulombs per second
• A vector quantity has both magnitude and direction, while a scalar quantity only has magnitude.
• Velocity = distance travelled / time taken
• Acceleration = change in velocity / time taken
• Distance (d) = area under graph of displacement vs time
• Pressure = force per unit area
• Power = work done / time taken
• Work done by a constant force moving through a displacement = Fd cosθ
• Kinetic energy = 0.5mv^2
• Work done = change in potential energy + change in kinetic energy
• Power (P) = work done / time taken
• Ohm’s Law states that the current passing through a conductor is directly proportional to the potential difference applied across the ends of the conductor if the temperature remains constant.
• Power = Current x Voltage
• Electric current (I) = rate at which charge flows past a point, measured in amperes
• Resistance (R) = voltage / current
• Power (P) = V x I
• Electric field strength (E) = Voltage / distance
• The SI unit for current is ampere (A).