physics

• Work done = force x distance moved in direction of force
• Distance is measured in metres and is a measure of the total length or distance of a journey
• Displacement is the distance between the start and end point
• Distance is a scalar quantity, meaning it has size but not direction
• Displacement is a vector quantity, meaning it has both size and direction
• Speed is a measure of how quickly something moves
• Average speed doesn't provide much information about a journey because speed usually changes
• Instantaneous speed is the speed at a particular instant, such as what you see on a car's speedometer
• Velocity is similar to speed, but it is a vector quantity, meaning it also has direction
• Changing direction results in a change in velocity, but not necessarily a change in speed
• There are different ways of measuring speed, such as light gates at the Olympic games, radar or lasers used by the police, and parking sensors on cars
• Work done = force x distance
• Potential energy (PE) is stored energy that can be converted into kinetic energy when released, such as gravitational potential energy (GPE).
• Kinetic energy (KE) is the energy an object has due to its motion, given by KE = 1/2 mv^2.
• Energy is the ability to do work or transfer heat.
• Kinetic energy is the energy an object has due to its motion, while potential energy is stored energy that depends on position.
• 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 can be transferred from one place to another or transformed into different forms.
• <S: >An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
• The SI unit of energy is the joule (J).
• Kinetic energy is the energy of motion. It is proportional to the mass and velocity of an object.
• Elastic collisions occur between two objects where they bounce off each other without losing any energy.
• The law of conservation of energy states that energy cannot be created nor destroyed, only transferred from one form to another.
• Energy can be stored in many forms, including kinetic energy, potential energy, thermal energy, chemical energy, nuclear energy, gravitational energy, elastic energy, electrical energy, magnetic energy, sound energy, electromagnetic radiation energy, and radiant energy.
• In a closed system where no work is done, the total mechanical energy remains constant.
• Kinetic energy (KE) is the energy an object possesses due to its motion, with the formula KEk = 1/2mv^2.
• The total mechanical energy of an object is equal to the sum of its PE and KE.
• Power is defined as energy transferred per second
• The equation for GPE is PEg = mgh.
• The SI unit for work done is joules (J)
• Newton's second law states that Fnet = ma, where Fnet is the resultant force acting on an object, m is the mass of the object, and a is the acceleration of the object.
• Distance in cm should be divided by 100 to convert to meters
• Distance in m should be divided by 1000 to convert to km
• Time in minutes should be multiplied by 60 to convert to hours
• Time in seconds should be divided by 60 to convert to minutes
• Speed in m/s should be multiplied by 3.6 to convert to km/h
• Speed in km/h should be divided by 3.6 to convert to m/s
• Speed is calculated by dividing distance by time (s = d/t)
• Displacement sketches are important in physics
• Distance-time graphs are used in speed calculations