# Water Resistance

Looking at the effects of water resistance.

Key stage:  KS 2

Curriculum topic:  Forces

Curriculum subtopic:  Resistance and Friction

Difficulty level:

### QUESTION 1 of 10

Friction is a force that acts whenever moving objects come into contact with each other. The objects don't have to be solid. Friction also works for gases and liquids.

Air resistance is the friction force that acts when a solid object moves through the air. This worksheet is about water resistance, the friction force that acts on an object moving through water.

Water resistance is important. Cutting down water resistance as much as possible can make the difference between a gold medal and a silver one!

What effect does water resistance have on an object moving through the water?

it twists it sideways

it speeds it up

it slows it down

it has no effect

What sort of force is water resistance?

a pulling force

a pushing force

a turning force

Which is the stronger force, water resistance or air resistance?

water resistance

air resistance

there is no difference

Look at the shape of this boat. Do you think it is designed to...

help the boat go faster

make the boat slower

not make any difference to the speed

What word describes something that is shaped to go through the water with the least amount of water resistance?

waterproofed

airtight

streamlined

outlined

Which is more streamlined, the tuna...

or the seahorse?

both are streamlined

the seahorse

the tuna

• Question 1

What effect does water resistance have on an object moving through the water?

it slows it down
EDDIE SAYS
Water resistance acts in the opposite direction to the direction of travel, so it slows the object down.
• Question 2

What sort of force is water resistance?

a pushing force
• Question 3

Which is the stronger force, water resistance or air resistance?

water resistance
EDDIE SAYS
Water resistance is a much greater force than air resistance. If you have tried to walk through the water in a swimming pool you will know how much harder it is to move through water than it is to move through air.
• Question 4

Look at the shape of this boat. Do you think it is designed to...

help the boat go faster
EDDIE SAYS
The narrow shape of this boat is designed to cut through the water, reducing water resistance so the boat can go as fast as possible.
• Question 5

What word describes something that is shaped to go through the water with the least amount of water resistance?

streamlined
EDDIE SAYS
Something that is shaped to pass easily through water, or air, is said to be streamlined.
• Question 6

Which is more streamlined, the tuna...

or the seahorse?

the tuna
EDDIE SAYS
The body of a tuna is very well streamlined and tuna are among the fastest swimmers in the ocean. Seahorses tend to swim slowly amidst clumps of seaweed.
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