Select all of the forces below that are contact forces. Gravitational force
Applied force
Spring force
Tension force
Air resistance (drag) force
Normal force
Frictional force
Electric force

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is