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How to solve for the horizontal displacement when the projectile starts with a horizontal initial velocity. We also explain common mistakes people make when doing horizontally launched projectile problems.

Visualising position, velocity and acceleration in two-dimensions for projectile motion.

Visualising, adding and breaking down vectors in 2 dimensions.

Defining and comparing tension, weight, friction and normal forces using free body diagrams.

Determining how fast something will be traveling upon impact when it is released from a given height. 

Plotting projectile displacement, acceleration, and velocity as a function of time.

There are many different processes and phenomena that emit electromagnetic radiation. Humans have taken advantage of many of these processes to develop technologies that use electromagnetic radiation.

Photoelectric materials emit electrons when they absorb light of a high-enough frequency.

When electromagnetic radiation is absorbed by a material the energy it carries has to go somewhere. When lower energy waves, like radio and infrared waves, are absorbed there can be an increase in temperature of the absorbing material. Higher energy waves, like x-ray and gamma waves, can actually permanently damage or change materials. Learn about the different types of electromagnetic waves and how their energies can influence their effects on objects.

An explanation of wave interference and solution of a few examples to find the value of the total wave when two wave pulses overlap