Simple Machines

123456789
Across
  1. 4. a sloping ramp up which heavy loads can be raised by ropes or chains
  2. 7. the branch of science concerned with the nature and properties of matter and energy.
  3. 8. the systematic study of the structure and behavior of the physical and natural world through observation, experimentation, and the testing of theories against the evidence obtained.
  4. 9. a rod or spindle (either fixed or passing through the center of a wheel or group of wheels.
Down
  1. 1. a wheel that carries a flexible rope, cord, cable, chain, or belt on its rim.
  2. 2. Simple ________
  3. 3. a piece of wood, metal, or some other material having one thick end and tapering to a thin edge, that is driven between two objects or parts of an object to secure or separate them.
  4. 5. a rigid bar resting on a pivot, used to help move a heavy or firmly fixed load with one end when pressure is applied to the other.
  5. 6. a circular object that revolves on an axle and is fixed below a vehicle or other object to enable it to move easily over the ground.
  6. 8. ________ Machine