Definition Physics AS

5. mass multiplied by its velocity.
6. The turning effect of a force (or moment or torque)about a point is defined as the force x the perpendicular distance from the point to the line of action of the force, i.e. moment = F × d.
7. A vector is a quantity that has magnitude and direction.
8. A _________ wave is one where the particle oscillations are at 90° (right angles) to the direction of travel (or propagation) of the wave.
11. The spring constant is the force per unit extension.
12. For a system to be in equilibrium, ∑ anticlockwise moments about a point = ∑ clockwise moments about the same point.
14. the spreading out of waves after passing through an aperture or meeting the edge of an obstacle.
15. the ratio of stress to strain
16. The terminal velocity is the constant, maximum velocity of an object when the resistive forces on it are equal and opposite to the accelerating forces
18. A scalar is a quantity that has magnitude only.
19. It is the force per unit cross-sectional area when equal opposing forces act on a body.

1. The wavelength of a progressive wave is the minimum distance between two points on the wave oscillating in phase.
2. _________ states that if two or more waves occupy the same region then the total displacement at any one point is the vector sum of their individual displacements at that point.
3. there is no loss of kinetic energy in _____ collision
4. Waves or wave sources, which have a constant phase difference between them (and therefore must have the same frequency)
9. The amplitude is defined as the maximum displacement of any particle from its equilibrium position.
10. Waves which move energy from place to place without the transfer of matter
13. The tension in a spring or wire is proportional to its extension from its natural length, provided the extension is not too great.
17. A _________ wave is one where the particle oscillations are in line with (parallel to) the direction of travel (or propagation) of the wave.