Science (machines) Crossword Puzzle

QUESTIONS LIST:

• aquaplane : to skid or slide on the surface of water
• complex machine : a machine built from two or more simple machines
• engines : machines that change the energy from a fuel into movement
• friction : the force that opposes motion when one surface slides, or tends to slide, over another
• lubricant : a substance such as oil that reduces the friction between two surfaces
• mesh : when the teeth on gear wheels overlap
• motor : a machine that converts another form of energy into kinetic energy
• opposes : acts against; on opposite sides
• pitch : how high or low a sound is
• rough : not smooth; a surface with lumps and bumps
• screw : a simple machine that uses a spiral thread to increase a turning force
• skidding : when a vehicle's wheels lose grip and spin or slide on the road
• smooth : level; without lumps or bumps
• teeth : projections around the edge of a gear wheel
• thread : the spiral groove around a screw
• tread : the grooves in a tyre or the sole of a shoe
• turning motion : movement around a pivot or turning point; like a door turning on a hinge
• wear : damage caused by friction