Activity 13

Match the definitions with their statements

STATEMENTS

  1. Conservation of energy principle

  2. Friction

  3. Frictionless system

  4. Ideal machine

  5. Actual machine

  6. Efficiency

DEFINITIONS

  • Force that makes the relative motion between two objects more difficult.

  • Is the ratio of energy used by a machine to the useful work the machine has done.

  • Energy can neither be created nor destroyed; it can only be transformed from one state to another.

  • Machine in which there is loss of energy (i.e., real machine)

  • Ideal system with no friction forces within it.

  • Theoretical machine in which there is no loss of energy (e.g., because of the friction).