Electricity & Motion
What type of machine coverts electrical energy to mechanical energy using magnetism?
Electric Motor
Which force does not require contact and can act on objects from a distance?
Gravity
Which tool could be used to model wave motion during a scientific investigation?
slinky, rope
What tool helps scientists determine the chemical composition of distant stars?
Spectroscope
A coil of wire wrapped around an iron core is rotated in a magnetic field and electric current begins to flow. What device is this set-up?
Generator
To have motion, a body must experience a change in what?
Position (Net-force cannot be zero)
If the speed of a sound wave increases, what other property of the wave must also increase when all other wave properties are held constant?
Frequency
Approximately how many times does the Moon revolve around Earth in one year?
About 12 times
Long distance electrical transmission is best achieved if the voltage of the electrical current is increased to thousands of volts. What component in the electrical grid performs this function?
Transformer
You push on a wall with 20 N of force, but it does not move. Are the forces balanced or unbalanced? Which one of Newton's laws is being represented?
Balanced & Third Law
The frequency of a transverse wave increases, but its speed remains constant. How does this influence the wave’s wavelength and the amount of energy carried by the wave?
The wavelength decreases and the energy carried by the wave increases
If the average distance between the Earth and Sun were reduced by half, what changes would occur in the Sun's gravitational pull on Earth and Earth's period of revolution?
GRAVITATIONAL PULL WOULD INCREASE, AND THE PERIOD OF REVOLUTION WOULD DECREASE.
Why is AC current more suitable for long-distance transmission than DC current?
current can be easily transformed to higher or lower voltage
What is the equation for finding force?
Force = mass x acceleration
What characteristic of a mechanical wave differentiates it from an electromagnetic wave?
MECHANICAL WAVES CANNOT BE TRANSMITTED THROUGH EMPTY SPACE.
How does the gravity of the Sun and the Moon compare when they affect the Earth's tides?
THE MOON HAS A GREATER PULLING EFFECT ON THE EARTH’S TIDES BECAUSE IT IS CLOSER TO THE EARTH THAN THE SUN.
What is the relationship between electric motors and electric generators?
EG converts mechanical energy to electrical energy/EM converts electrical energy to mechanical
Jasmine is driving a car and has a mass of 60 kg. Laura is her passenger and has a mass of 90 kg. Jasmine suddenly brakes to avoid hitting a deer. Who experiences the greatest force due to the seatbelt?
Laura because she has greater mass
Explain the 7 parts of an electromagnetic spectrum wave and give an example of each part.
RADIO WAVES-RADIO/TV
MICROWAVES-MICROWAVE/WIFI
INFRARED WAVES-REMOTE CONTROL/HEAT LAMP
VISIBLE LIGHT-SUN/RAINBOW
ULTRAVIOLET-FLUORESCENT BULB/VITAMIN D
X-RAYS-X-RAY/ULTRASOUND
GAMMA RAYS-NUCLEAR POWER PLANT/URANIUM
What are the dimmest, but hottest stars? What are the brightest and hottest stars? What are the coolest and dimmest stars? What are the coolest, but brightest stars?
White Dwarfs, Blue Giants, Main sequence, Super Red Giants