 # Gravity

In this worksheet, students will explore the force that keeps our feet on the ground and stops the moon or satellites from moving off into space: gravity. Key stage:  KS 3

Curriculum topic:   Physics: Motion and Forces

Curriculum subtopic:   Forces

Difficulty level:   ### QUESTION 1 of 10

Gravity is a force that acts between all objects that have a mass - from the smallest object to largest of planets. Isaac Newton was a famous English scientist. It is said that he saw an apple fall from a tree and accelerate towards the Earth, and he named the force responsible for pulling the apple towards the Earth gravity Isaac Newton was also able to show that it was the force of gravity that held all the planets of the solar system in their orbits.

The force of gravity depends on the mass of the objects and the distance between the objects. The greater the mass of the objects, the greater the force of gravity between them.

So, the force of gravity between two very heavy objects such as the planet Earth and the moon is much greater than the force of gravity between two small objects such as an apple and an orange.

The further apart the two object are, the less the force of gravity. It is a large force of gravity that holds the moon in orbit around the Earth. The  gravitational force of the moon is responsible for the tides. Only a very weak force of gravity would occur between two objects of low mass. The force is so weak that we are unable to feel it.

The gravitational force between an object and the Earth is known as the weight of the object. On Earth, the force of gravity pulls objects down towards the centre of the Earth and the weight of the object can be calculated using the gravitational field strength.

Gravitational field strength is equal to 10 N/kg (Newtons per kilogram).

Type the name of the famous English scientist who is credited as being the first scientist to discover the force of gravity.

What are the two factors that affect the force of gravity between two objects?

distance between the objects

colour of the objects

size of the objects

mass of the objects

Assuming the objects are all the same distance apart, which TWO objects would have the greatest force of gravity between them?

Tick the TWO you agree with.

table tennis ball

tennis ball

football

bowling ball

Assuming the objects are all the same distance apart, which TWO objects would have the greatest force of gravity between them?

Tick the TWO you agree with.

1 kg weight

10 kg weight

100 kg weight

1000 kg weight

Which ONE of the following members of the solar system are responsible for the tides on Earth?

the Moon

Pluto

Neptune

Uranus

Complete the sentence below by typing the missing word into the text box:

The gravitational force between an object and the Earth is known as the _________ of the object.

What is the gravitational field strength on Earth equal to?

1 N/kg

10 N/kg

100 N/kg

1000 N/kg

Gravitational field strength has the the units N/kg, but what does this stand for?

Newtons per Kelvin

Newtons per kilogram

Newtons per kilogravity

Newtons per kilometre

• Question 1

Type the name of the famous English scientist who is credited as being the first scientist to discover the force of gravity.

Isaac Newton
Sir Isaac Newton
EDDIE SAYS
Sir Isaac Newton was a great scientist and his works covered more than just work on gravity. If you find the time, you can research Isaac Newton to discover why some people class him as the greatest scientist of all time.
• Question 2

What are the two factors that affect the force of gravity between two objects?

distance between the objects
mass of the objects
EDDIE SAYS
The mass and the distance between the objects dictates the strength of the force of gravity between the objects.
• Question 3

Assuming the objects are all the same distance apart, which TWO objects would have the greatest force of gravity between them?

Tick the TWO you agree with.

football
bowling ball
EDDIE SAYS
The greater the mass, the greater the force of gravity; so the bowling ball and the football would have the greatest force of gravity between them because they have a greater mass than the other two options.
• Question 4

Assuming the objects are all the same distance apart, which TWO objects would have the greatest force of gravity between them?

Tick the TWO you agree with.

100 kg weight
1000 kg weight
EDDIE SAYS
The greater the mass, the greater the gravitational pull between them.
• Question 5

Which ONE of the following members of the solar system are responsible for the tides on Earth?

the Moon
EDDIE SAYS
The gravitational pull of the moon causes the tides of the seas here on Earth.
• Question 6

Complete the sentence below by typing the missing word into the text box:

The gravitational force between an object and the Earth is known as the _________ of the object.

weight
EDDIE SAYS
Weight is a results of the Earth pulling an object towards it.
• Question 7

What is the gravitational field strength on Earth equal to?

10 N/kg
EDDIE SAYS
Gravitational field strength on Earth is equal to 10 N/kg. It is lower on the moon, so your weight would be much lower if you were standing on the moon.
• Question 8

Gravitational field strength has the the units N/kg, but what does this stand for?

Newtons per kilogram
EDDIE SAYS
The units for force are named after Sir Isaac Newton.
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