speed, velocity,physics

1. Speed in a given direction is
velocity
called ____________________
Velocity and speed are very similar ideas, but velocity is a vector, and speed is not. Suppose
we knew that someone was driving at thirty-five kilometers an hour (35 km/hr), but the
direction wasn't given. How would you draw an arrow to represent a vector? You can't know
how to draw the vector if you only have one value (either amount or direction). In this
example, you were never told about the direction. Physicists would say that the speed is
thirty-five kilometers an hour (35 km/hr), but the velocity is unknown. On the other hand, if
you're moving at 35 km/hr in a northern direction, then you would have an arrow pointing
north with a length of 35. Physicists would say that the velocity is 35 km/hr north.
Velocity is the rate of motion in a specific direction. I'm going that-a-way at 30 kilometers
per hour. My velocity is 30 kilometers per hour that-a-way. Average speed is described as a
measure of distance divided by time. Velocity can be constant, or it can change
(acceleration). Speed with a direction is velocity.

2. List the electromagnetic spectrum in order,
from largest to smallest wavelength.
KNOW THIS!!
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Radioactive
monkeys
infect
vicious unicorns,
xcept George

3. •
•
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List the electromagnetic spectrum in
order, from largest to smallest
wavelength. KNOW THIS!!
Radio waves
Microwaves
Infrared
Visible light
Ultraviolet
X-rays
Gamma rays

4. The velocity a rocket must reach to
establish an orbit around Earth is
ORBITAL VELOCITY
called• ____________________.
A rocket reaching the orbital velocity
(1st cosmic velocity) will enter into
orbit around the Earth (C), higher speed
will lead to an elliptical trajectory (D).
When the escape velocity (2nd cosmic
velocity) is attained, the rocket will
move away (E).

5. What are two firsts achieved by the
Soviet Union during the space race?
• First artificial satellite
• First man in space

6. The main advantage of multistage
rockets is that…
• What characterizes it as "multi-stage" is that it successively jettisons one
or more stages as they become empty.
• It is effectively one or more rockets (stages) stacked on top of or attached
next to each other ("parallel staging"); in order to reduce the total amount
of mass which needs to be accelerated to the final speed/height
• THE ROCKET GETS LIGHTER AND CAN GO FASTER/FURTHER
http://www.youtube.com/watch?v=sQw_C5KLhFM&feature=related

7. Reflecting telescopes are different from
refracting telescopes because…
• REFLECTING telescopes REFLECT light off of a
mirror.
• REFRACTING telescopes collect and BEND light
with convex lenses.

8. Some of the main uses of satellites
are…
• Communications
• Collecting weather data
• Measuring ocean currents, temperatures and other scientific data.
• Click here for cool website with more satellite information

9. It’s a basic law of physics that for
every force, or action, there is…
• An EQUAL and OPPOSITE REACTION.

10. The space race was between what two
countries?
• The Soviet Union (Russia)
• The United States

11. The distance
between the
crest of one wave
and the crest of
the next wave is
the
wavelength
wave’s______.

12. Exploration of space beyond the moon
has been done by
• Unmanned probes.
• The US manufactured Voyager space probes
have left the SOLAR SYSTEM!
• Click here to learn more about voyager

13. A large artificial satellite on which
people can live and work for long
periods is called a…
• SPACE STATION

14. The reaction force that propels a
rocket forward is called…
• THRUST