Across
- 4. change in momentum. a vector
- 6. fraction of energy which is usefully transferred
- 7. the force which opposes motion when one surface moves over another. it is caused by the roughness of the surfaces
- 10. and distance the scalar versions of velocity and displacement
- 12. the rate of change of velocity with time a vector, units m/s/s
- 13. the distance traveled in a particular direction from a specified origin
- 14. an unbalanced force causes an acceleration
- 16. upward force on a body which is immersed in a flud (liquid or gas)
- 18. one newton is the force which will accelerate
- 19. the force of gravity on a body
- 20. reaction two objects contact each other exert a force on each other which is perpendicular to the surface
Down
- 1. the property of matter which makes it resist acceleration
- 2. the rate of change of displacement with time. a vector, units m/s
- 3. upward force on the wing of an aircraft due to the air flowing around it
- 5. the value of a quantity measured at an instant in time, as opposed to an average quantity measured over a period of time
- 8. collisions the total ke is decreased ; perfectly inelastic if they stick together
- 9. energy energy an object has as a result of its motion
- 11. the rate of doing work. watts
- 15. the ability to do work
- 17. a force produced in a body. the opposite is compression
- 19. is done when a force moves an object in the direction of force. scalar