Year 9 triple science 🧬

What are the uses of earth observing satellites?

- weather forecasting
-making maps
-Scientific research
-measurements of the earth
-spying on other countries

What are the uses of communication satellites ?

-Transmit TV picture
-Transmit telephone signals

What is the definition of a satellite?

A satellite is any object that orbits a planet, or a star this can be natural or man-made .

What is an example of a natural satellite?

The earth is a satellite for the sun .
The moon is a satellite for the earth.

What happens to the orbit speed- The close of the satellite is to the earth?

The orbit speed gets faster because they are closer to the point of gravity.

What happens to the orbit time of a satellite the faster to the earth?

The orbit time will decrease as it takes less time to make a full circle.

Why don’t satellites crash into the earth ?

Because they reach the high point and gravity pulls them to the center of the earth . It always moves in a circular motion.

How is a satellite kept in orbit ?

A satellite is kept in orbit by the
gravitational pull/attraction between the satellite, and the planet its orbiting

How much larger is the sun than the earth?

300,000 times

How fast does the earth move around the sun?

The earth moves around the sun at approximately 100,000 km/h

What would happen if there was no gravity from the sun?

The earth would fly off into space, as there would be no gravitational attraction to keep it in its orbit.

What does the force of gravity do to the sun and the earth?

It keeps the earth moving in an elliptical(oval) orbit around the sun

What is the equation for gravity?

Gravity = mass * weight

What does the mass mean for the force?

The bigger the mass of an object, the stronger the force exerts

What is your weight measured in?

Newtons

What is your mass measured in?

Kg

How do you find your weight on a planet?

Weight = Mass (kg)* gravitational field strength .

N*kg

How do you find your mass?

Mass = weight (divided by) gravitational field strength.

What happens to the gravity when two objects attract each other are far apart

The gravity is weaker

What happens to the waves of the electromagnetic spectrum?

The waves all travel at the same time, but they have different frequencies and wavelengths

Characteristics

A defining feature or property of a living organism
Image

Inherited/genetic

From a parent through genes defined by the organisms DNA e.g hair color

Environmental

Affected by lifestyle e.g hair length

How many chromosomes does a human have

46

What’s a hybrid?

Is the offspring of a crossbreed between two different(but closely related species. They are usually in fertile

What are gammets ?

Sex cells
Egg and sperm

Discontinuous variation

Characteristics that can be counted, or only have a few options e.g eye Colour

Continuous variation

Characteristics that can be measured and have a range of values e.a height and weight

1 breed + 1 breed =

A cross breed

What are the 2 types of cell ?

Haploid
Diploid

What is a diploid?

99.9% of cells in your body

What is a haploid ?

Only sperm and egg cells they have
50% of the genetic information.