Q3 Week/Lesson 2: Gravity

Q3 Week/Lesson 2: Gravity

Grades Six- Science Module 2

Gravity

Science 6 - Q3 Week 2

Let's Try

• You learned this topic from your previous lesson. Let’s us try to activate your prior learning by answering the following questions. Let’s do this. 

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Multiple Choice

1. Why did a coin throw to the air fall back to the ground?

• The weight of the coin made it fall back.

• Air caused the coin to fall on the ground.

• The size of the coin affected its movement.

• The force of gravity caused the coin to fall back.

Multiple Choice

How does gravity affect objects near Earth? It _____.

• pulls them in.

• pushes them away.

• makes them bigger.

• makes them move faster.

Multiple Choice

One of the hobbies developed by most people during this time of pandemic is cycling. It is one way of improving the body’s immune system to protect oneself against this Corona Virus 2019. Most cyclists have difficulty in running a bike uphill than downhill. Why does a bicycle travel faster in going down than in going up?

• It is moving against gravity.

• It is moving towards gravity.

• It is being pushed by the wind.

• It is being pushed by the weight of the bicycle.

Multiple Choice

When objects are closer together, what happens to its amount of gravitational force?

• It decreases.

• It disappears.

• It increases.

• It stays the same.

Multiple Choice

A coconut fruit falls from a tree. What makes it moves faster and faster as it approaches the ground?

• Force of gravity.

• Force of the wind.

• Height of the tree.

• The size of the fruit.

GRAVITY

Well done! Come on let’s find out more about this topic. 

GRAVITY

Today, we will learn new concepts or ideas about the things around us. Are you ready?

They say that one of the traits of a scientist is being inquisitive and curious in its surroundings. Have you ever also wondered why certain things happen?

What is gravity?

Anything that goes up ultimately goes down. Things do not fly on the Earth’s surface. This is because Earth is exerting a strong attractive force on you and the things around you. This force is called gravity. (Sarte 2016)

Flashback (Gravity)

Sir Isaac Newton, a well-known scientist, discovered gravity about 300 years ago. Newton saw an apple fell from a tree towards the ground. At first, he thought, “Why didn’t an apple goes up?” Then, he realized that there was a force that made it fall on the ground and he called it gravity. (D'Souza 2015) 

About Gravity

Gravity is an invisible (which means it cannot be seen) force that pulls objects toward each other. Earth’s gravity is what keeps you on the ground and what make things fall. (NASA 2020)

• The principle of gravity states that, everything in the universe whether big or small, exerts gravity on other things. Since Earth is massive (large and heavy), it strongly attracts anything on its surface. The same concept keeps the planets and other heavenly bodies in place. Since the sun is more massive than all the planets, its gravity pulls them into around its orbit. (Sarte 2016) Thus, this gravity is what keeps the planets in orbit around the sun and the moon around the earth. 

TRIVIA TIME!

Do you know that the tides in the sea and oceans happen because of the gravitational pull of the moon?

GRAVITATIONAL FORCE

Gravitational force is the force of attraction between all masses in the universe, especially the attraction of Earth’s surface. The more distant the body from the earth, the less the gravitational force of attraction is. (Padpad 2017)

Wow! Isn’t it amazing? That’s how gravity works! 

Wow! Isn’t it amazing? That’s how gravity works! 

If the boy will drop the objects of the same kind and mass, in of the same height and time, which do you think will hit the floor first, THE CRUMPLED PAPER OR THE PLAIN PAPER? Why?

In the above situation, the crumpled paper will land on the ground first. It shows that air resistance affects movement of falling objects. The sheet of paper falls slowly because of air resistance. The surface area of the sheet of paper is greater than the crumpled one. The surface area of the sheet of paper is affected by the air and causes it to drop slowly. The crumpled paper has a smaller surface area, which is not affected by air so it moves faster. The greater is the surface area of a falling object, the greater is the air resistance that affects its movement.

How about when there is no air resistance? What would happen to the falling objects?

The speed of falling objects will be different on Earth and on the moon. If air is removed, the air resistance will disappear. When a stick and a feather is dropped on Earth at the same time, the stick will fall faster than the feather. Air resistance acts against the feather, which slows down its falling. But if you drop the feather and the stick at the same time on the moon, the stick and the feather will fall at the same speed. The moon has no air, therefore, there is no air resistance acting on a falling object. ( (Padpad 2017)

So, do you know now why such things happen? How gravity affects movements of objects? Come on, let’s explore the following activities and experience the wonders of this force.

Hello kids! I hope you learn something from the discussion about gravity. Below is a poem about gravity. Read the poem and answer the comprehension questions below. Are you ready? You can do it.

Gravity (by Lorelyn A. Cosep)

Isaac Newton’s curiosity lead him in discovering this gravity.

It is when an apple fell from a tree that made him realized that a force set it free.

Gravity is an invisible force that keeps everything on the ground of course!

Take a coin and toss it high. It will fall back on the ground and you would wonder why!

Gravity (by Lorelyn A. Cosep)

The bigger the object, the more gravity it has. Planets and other heavenly bodies have different mass.

The sun’s massive size keeps them in its place Its gravitational pull attracts them in space.

Despite this strong attraction, barriers are all around The presence of air resistance affects object’s motion on the ground. It’s hard to imagine when gravity is missing. Weightlessness will happen on Earth’s surface and everything will float freely on space. 

Open Ended

Comprehension check: Please have time to answer the following questions.

What is gravity and who discovered gravity?

Open Ended

Comprehension check up:

How does air affect the falling object? What would happen if air is removed?

Open Ended

Comprehension check up:

How does the mass of an object affect gravity?

Open Ended

Comprehension check-up:

What will happen if there were no gravity on Earth?

Multiple Select

Choose the statements by checking the box which describes about gravity. Come on, you start!

• It is a non-contact force.

• It pulls objects toward each other.

• It is a force that can be seen everywhere.

• It is a force that pulls things down to earth.

Multiple Select

Choose the statements by checking the box which describes about gravity. Come on, you start!

• It keeps the things on the earth’s surface from floating

• It holds the planets and other heavenly bodies to stay on its orbit.

• It is a force that causes an object to move, stop or change direction.

Multiple Choice

There is gravity between the Milky Way Galaxy and other galaxies.

• True

• False

Multiple Choice

There is gravity between you and the moon.

• True

• False

Multiple Choice

Which of the following would have the most gravity between them?

• two ping pong balls 1 meter apart

• two ping pong balls 2 meters apart

• two bowling balls 1 meter apart

• two bowling balls 2 meters apart

Multiple Choice

Mass can be best defined as:

• The weight of an object

• The amount of matter in an object

• The volume of an object

• The size of an object

Multiple Choice

Which of the following would NOT be an example of the force of gravity?

• The moon orbits around Earth

• Earth revolves around the Sun

• A ball hit in the air comes down into the outfielder's glove

• All of the above are examples of gravity

Multiple Choice

When will the forces of gravity between two objects be the GREATEST?

• when the masses of both objects are small and the objects are far apart

• when the masses of both objects are large and the objects are close together

• when the masses of both objects are small and the objects are close together

• when the masses of both objects are large and the objects are far apart

Multiple Choice

Which statement about gravity is true?

• gravity causes objects to pull towards one another

• gravity causes objects to push away from each other

• gravity only takes place between planets

• the moon doesn't have any gravity

Multiple Choice

What two things determine the gravity of an object?

• mass & weight

• mass & distance

• density & mass

• volume & distance

Multiple Choice

Without gravity, the stars, planets and all objects in the universe would _______.

• continue to orbit each other

• move in a random direction

• move in a straight line

• stop moving

Multiple Choice

Without gravity, the stars, planets and all objects in the universe would _______.

• continue to orbit each other

• move in a random direction

• move in a straight line

• stop moving

Congratulations! See you on the next lesson!