Physical Science

Across

4. Space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there.
5. an optical phenomenon that creates the illusion of water and results from the refraction of light through a non-uniform medium
11. the one who proposed the laws of planetary model
12. transparent optical element with flat, polished surfaces that refract light
13. is the point in the orbit of a celestial body where it is nearest to its orbital focus
20. is the bending of a wave when it enters a medium where its speed is different
21. an optical instrument designed to make distant objects appear nearer,
25. which is the point in the orbit where the celestial body is farthest from its focus
26. He changed the way of thinking, not only astronomically but also religiously.by saying the universe is sun-centered.
28. color that has the lowest frequency and the longest wavelength
29. the property or tendency of a moving object to continue moving.
30. the change in position of an object
33. the branch of mechanics concerned with the motion of objects without reference to the forces that cause the motion
34. the speed of an object in a particular direction
37. a space between objects, units, points, or states
38. the natural agent that stimulates sight and makes things visible.
41. the rate at which velocity changes over time
42. made important contributions by devising the most precise instruments available before the invention of the telescope for observing the heavens
43. An acronym for the colours of the visible light spectrum
44. the fundamental particle of light. They have a unique property in that they are both a particle and a wave.
45. is the branch of physics which involves the behaviour and properties of light.
47. He is sometimes called the grandfather of science. He studied under the great philosopher Plato

Down

1. the branch of science concerned with the nature and properties of matter and energy
2. invent/devised a telescope that could enlarge objects up to 20 times
3. an object, whether natural (such as the moon),that revolves around a central body.
6. distance divided by time
7. the gravitationally curved path of an object around a point in space
8. the apparent daily motion of stars around the Earth
9. Earth-centered model of the universe
10. the combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or canceled.
14. an object's change in position relative to a reference point
15. is a point on the wave where the displacement of the medium is at a maximum
16. the branch of science that deals with celestial objects, space, and the physical universe as a whole.
17. sus-centered model of the universe
18. the act of reflecting, as in casting back a light or heat, mirroring, or giving back or showing an image
19. the separation of white light into colors, or the separation of any radiation according to wavelength.
22. F=ma is the formula of
23. the distance over which the wave's shape repeats
24. a force that attracts any objects with mass.
27. a force that opposes motion between two surfaces that are in contact
31. is the slight bending of light as it passes around the edge of an object.
32. the distance traveled divided by the time interval during which the motion occurred
35. proposed the three law of motion
36. an arch of colors formed in the sky in certain circumstances, caused by the refraction and dispersion of the sun's light by rain or other water droplets in the atmosphere
37. An object at rest will remain at rest unless acted on by an unbalanced force
39. a colour or shade
40. the transport of energy without the transport of matter
46. biggest star