Anh 10 - Bài 3- issac newton (mai anh)

Who is he?
What did he discover?
When did he discover the law of gravity?
Isaac Newton
the law of gravity

UNIT 3
GRAVI
TY

VOCABULARY
GRAVITY a high jumper

THE EARTH
THE MOON
VOCABULARY
Whirl around / travel around
Hurl off / shoot off
SPACE
Outer space
orbit
UNIVERSE
PLANET

A ROCKET
Take off
SPEED
escape from
A man-made satellite

Float about
ASTRONAUT
= spaceman
Space capsule /
space ship
Space suit
helmet
Weightless (adj)
Weightlessness (n)
Space flight
Anchor (v)

Do you agree or disagree?
1. Gravity pull everything down.
2. A champion high jumper can jump more than ten feet
off the ground.
3. As the earth whirl around, everything is thrown off the
earth.
4. Man-made satellites leaves the earth at very great
speeds.
5. Every person has a weight on the earth.
6. Astronauts orbiting the earth don’t have weight.
7. Weightlessness is a big problem.
8. Other bodies in the universe have a pull just as the
earth does.
9. The sun exerts a pull on other planets in its system.

Even a high jumper can jump only about
seven and a feet off the ground. The earth
pulls him so hard that he cannot jump any

higher. The pull of the earth is called gravity.

How high can a high jumper jump?
He can jump only about seven and
a half feet off the ground.
Why can’t he jump higher?
Because the earth pull him very hard.
What do you call the pull of the earth?
The pull of the earth is called gravity.

Gravity makes water run downhill. It
makes balls thrown into the air fall back
down, and ripe apples drop from trees.
Gravity keeps us all from being hurled off
the earth as it whirls around. It keeps the
moon travelling around and around the
earth instead of shooting off into space.

What would happen if there were not gravity?
If there were not gravity,
Water wouldn’t run down hill.
Ball thrown into the air wouldn’t fall back down.
Ripe apple wouldn’t drop from trees.
We would be hurled off the earth.
The moon would be shot into space.

Some man-made satellites have escaped
from the earth and gone into outer space
never to return. But to do so they had to
take off from the earth at a speed of more

than 25,000 miles an hour.

Can man-made satellites escape from the earth?
Yes, it can.
How can they escape from the earth?
They had to take off from the earth at a speed of more than 25,000 miles
an hour.
1km = 0.6214mile 25,000 miles ≈ 40,231km
1foot = 30.48 cm  7.5 feet = 228.6cm ≈ 2.28m

A person can easily find out how hard the
earth is pulling him. All he has to do is
weigh himself. If there weren’t gravity,
no one would weigh anything at all.

Can a person find out how hard the earth is
puling him? How?
Yes, he can. He can weigh himself.
What would happen if there were not gravity?
No one would weigh anything at all.

Astronauts orbiting the
earth in space capsules
are weightless. Before
anyone had made a
space flight, scientists
wondered whether a
person could stand
weighing nothing. Actually
weightlessness has been

no problem except for the
nuisance of having to
anchor every object in a
space capsule in place to
keep it from floating
about.

Do astronauts in space capsules have a weight?
No, they don’t. They are weightless.
Is weightlessness a big problem?
No, it isn’t. but they have to anchor every object in a space capsules in place to keep it from floating about.

All other bodies in the universe exert a pull
just as the earth does. The pull of the sun
keeps its whole family of planets from
running away.

What do all the bodies in the universe exert?
They exert a pull of the sun to keep its whole family of the planets from running away.

Do you agree or disagree?
1. Gravity pull everything down.
2. A champion high jumper can jump more than ten feet
off the ground.
3. As the earth whirl around, everything is thrown off the
earth.
4. Man-made satellites leaves the earth at very great
speeds.
5. Every person has a weight on the earth.
6. Astronauts orbiting the earth don’t have weight.

7. Weightlessness is a big nuisance.
8. Other bodies in the universe have a pull just as the
earth does.
9. The sun exerts a pull on other planets in its system.

Even a high can jump
only about seven and a half feet off
the . The earth
him so hard that he cannot jump
any higher. The pull of the earth is
called .
jumper
ground pulls
gravity

Gravity makes water run
. It makes balls
into the air fall back down, and ripe
apples drop trees.
Gravity keeps us all being
hurled off the earth as it whirls
. It keeps the moon
around and around the
earth instead of shooting off
space.
into
travelling
around
from
from

thrown
downhill

Some satellites
have escaped from the earth
and gone into never
to return. But to do so they had
to from the earth at a
speed of more than 25,000
miles an .
man-made
space
take off
hour

A person can easily find out how
hard the is pulling him.
All he has to do is
himself. If there weren’t ,
no one would weigh anything at
all.
earth
weigh
gravity

Astronauts orbiting the earth in
are weightless.
Before anyone had made a ,
scientists wondered whether a person
could stand weighing .

Actually has been no
problem except for the nuisance of
having to anchor every object in a
in place to keep it from
floating .
space capsules
space flight
nothing
weightlessness
space capsule
about