Force & Motion
Three laws
What is the formula for kinetic energy?
KE= 1/2mv2
What is a wave?
A disturbance that transfers energy from one place to another without transferring matter.
What is electric current?
A flow of charged particles.
What is a simple machine?
A basic mechanical device that changes the direction or magnitude of a force.
How does friction affect the motion of an object?
It can slow or stop the moving object.
What is potential energy?
The stored energy of an object due to its position or state.
What are the main types of waves?
Transverse and longitudinal waves.
What is Ohms Law?
V=IR
How does a lever work?
A lever consists of a rigid bar that rotates around a fixed point called the fulcrum.
What is the difference between balances and unbalanced forces?
With balanced forces there's no change in motion, but with unbalanced forces there's an acceleration in the direction of the net force.
What is the law of conservation of energy?
Energy cannot be created or destroyed, it can only be transformed from one form to another.
What is the wavelength of a wave?
The distance between two consecutive points that are in phase on a wave.
What is the difference between conductors and insulators?
Conductors promote the transfer of electrons while insulators prevent the transfer of electrons.
What is mechanical advantage?
The ratio of the output force produced by a machine to the input force applied to it.
How does mass effect the gravitational force between two objects?
The gravitational force increases as the mass of either object increases.
What is thermal energy?
The total kinetic energy of particles in a substance.
How does frequency relate to waves?
Frequency is the number of completes waves that pass a given point in one second.
What is a magnetic field?
A region around a magnet where magnetic forces can be observed.
What is the purpose of a pulley?
It's used to lift heavy object by changing the direction of the force applied.
What is terminal velocity?
Terminal is the constant speed an object reaches when the force of gravity pulling it downward is balanced by the air resistance pushing upward.
What is mechanical energy?
The sum of kinetic energy and potential energy in an object.
How is the speed of a wave calculated?
The formula Speed=wavelengthxfrequency
What is electromagnetic induction?
The process by which a changing magnetic field can induce an electric current in a conductor.
What is the difference between a compound machine and a simple machine?
A compound machine is made up of two or more simple machines working together, while a simple machine is just one machine.