Physics is the study of matter and its motion through space and time, but you knew that already! So, are you an ion or a neutron? Take our physics quiz and find out! You got this! What is the force resisting the relative motion of objects sliding against one another? Friction. Torque. Gravity. Thrust. Solid matter is mostly... Mass. Quarks. Empty space. Atoms. An object at rest has what kind of energy? Kinetic. Elastic. Mechanical. Potential. When you step on a scale, your weight is essentially... Your mass. Your buoyancy. A product of your mass and gravitational force. Inertia. A playground see-saw is an example of what simple machine? A pulley. A wedge. A lever. A screw. What derived unit is used to measure energy? Hertz. Watts. Joules. Ohms. The Law of Conservation of Energy states that energy... Can’t be created or destroyed. Is created but not destroyed. Is always kinetic. Is destroyed only at an event horizon. Not like you’ll ever use it, but who do you have to thank for inventing Calculus? Rene Descartes. Blaise Pascal. Euclid. Isaac Newton. Radioactive isotope decay is measured in... Newtons. Half-life. Ohms. Inches. The four fundamental interactions are the strong nuclear force, the weak nuclear force, gravity, and... Drag. Thermodynamics. Electromagnetism. Sexy time.