Project- Motion & Force Due Wednesday Oct. 21.1. On a Poster board. 2. Define speed, velocity, acceleration, & gravity. 3. Formulas to calculate speed, acceleration, force,

momentum, & pressure. 4. Pictures of moving objects (car, train, spacecraft,

….)5. At least 2 new inventions and research works

(2010-15) on high speed locomotives (search internet / books).

6. Disadvantages of ‘speed’. Mention any 2 accidents that killed many people, including year, date and how?

7. Reference books, websites, etc.

Bell work

1. In which of the following sound travels the fastest?

a) Water b) Steel c) Air

2. Name the parts of the human ear in the order of receiving sound from air to our brain –

Cochlea, Hammer, Stirrup, Ear Canal, Auditory Nerve, Anvil, Ear Drum.

Sound and temperature

If temperature increases, molecules get more energy, move faster and transfer sound waves faster.

Sound travels …………….. at high temp.

Test practice* Which two factors affect the speed

of sound? …………..……. and ……………….

……* Which factor is maintained the

same through out the experiment? …………….* How does increasing temperature

affect the speed of sound? …………………….

Quiz 1. Disturbance in a medium. 2. Wave travels in the direction of the disturbance. 3. Wave travels perpendicular to the direction of the

disturbance.4. Lowest point of a wave.5. Distance between one crest or trough to the next. 6. Distance between the rest line to the crest.7. Unit for measuring frequency.8. Waves bend when they move from one medium to

another. 9. Spreading of waves. 10.Interference in which waves cancel out each other.

Quiz 1. Spreading of waves. 2. Wave travels perpendicular to the direction of the

disturbance.3. Lowest point of a wave.4. Disturbance in a medium. 5. Distance between the rest line to the crest.6. Unit for measuring frequency.7. Wave travels in the direction of the disturbance. 8. Distance between one crest or trough to the next. 9. Interference in which waves cancel out each other. 10.Waves bend when they move from one medium to

another.

Class work1. What is the difference between

the speed of the sound in air at zero and 100 degree C?

2. Which moves faster, light waves or sound waves?

3. Does sound travel faster through a gas or a liquid?