Projectile motion describes the path of an object going through the air under its own influence. An example of this is someone throwing a shot put during a track meet. You can also demonstrate this in an experiment. Boston University has an introductory lab session that deals with investigating the properties of projectile motion. In this lab, students observe where a red ball lands in an online simulation. The ball stops when the value of the y-axis becomes a small negative number. After observing the simulation, students write values such as the range and time of flight in a table.
Columb's Law describes the force between two charged particles. You can demonstrate the principle of this law by using two balls in a lab. An experiment from Boston University involves giving two balls equal charges and placing them at various distances from each other. A force from a twisted wire balances the force that one charge exerts over the other. According to the directions for the experiment, the force provided by the wire should be similar to its twist angle.
According to Michigan State University, all electric forces and potentials are proportional to the charge of an object. So the field and potential are the electrical force and potential energy of an object divided by the charge of that object. Boston University has two online simulations for this experiment. In the first one, there are several charges the instructor can move along half circles. Students are asked to find the point on the half circle that gives the voltage reading of the highest magnitude for the test charges. In the second simulation, students move a charge to find other points that have the same or similar readings as the test charge.
According to an experiment from Boston University, students obtain an equation giving force as a function of distance between repelling magnets. First they must get the values to plug into the equation. Then they will use a second equation to obtain the related potential energy. One way to verify the potential energy, according to the BU experiment, is to roll a cart with magnets attached down an incline toward another set of magnets. The students will need to monitor the different types of energy.