"Mum, if gravity pulls everything down, why doesn't my balloon fall? And if air resistance slows things down, why does the racing car go faster when it's more streamlined? Doesn't that mean air is pushing it?"
Welcome to Year 5 forces, where your child's everyday sense of how things move meets the surprising reality of physics. This is the unit where children discover that heavier objects don't actually fall faster, that friction is essential as well as annoying, and that the air they can't see pushes hard enough to slow a parachute.
Forces is one of the harder topics in primary science because it asks children to rethink things they see every day. A ball doesn't simply "stop rolling": friction and air resistance slow it until it stops.
For many parents, this is where helping with homework becomes genuinely difficult. You remember that gravity exists and friction slows things down, but explaining why a feather and hammer fall at the same speed in a vacuum? That requires understanding you may not have retained from your own schooling.
This guide explains what Year 5 children learn about forces, why some of it is confusing, how to address common misconceptions, and practical ways to help at home.
What the National Curriculum Requires
The Year 5 science programme of study for forces is specific. Pupils should be taught to:
- Explain that unsupported objects fall towards the Earth because of the force of gravity acting between the Earth and the falling object
- Identify the effects of air resistance, water resistance, and friction, that act between moving surfaces
- Recognise that some mechanisms, including levers, pulleys, and gears, allow a smaller force to have a greater effect
Alongside this, the working scientifically objectives ask children to plan and carry out investigations and explain their results. Many schools also use force meters (newton meters) in practical work.
Understanding Gravity: The Force That Never Switches Off
Gravity is simultaneously the most familiar and most misunderstood force your child will encounter.
What Gravity Actually Is
Gravity is a pulling force between all objects that have mass. We only notice it when one of the objects is enormous, like a planet. The Earth pulls you towards its centre, and that pull is what you feel as weight.
At Year 5 level, children should understand:
- Gravity always pulls objects toward the centre of the Earth (which we experience as "downward")
- Gravity acts on all objects with mass, regardless of size, shape, or material
- On Earth's surface, gravity gives objects weight (the force of gravity acting on an object's mass)
- Gravity's pull gets weaker the further you are from Earth, but it never switches off. Astronauts on the space station feel weightless because they and their station are falling freely around the Earth together, not because gravity is weak up there (it is still about 90% as strong as on the ground)
Mass and Weight (This Comes Later, in Key Stage 3)
Your child may hear that mass (how much stuff is in an object, in kilograms) is different from weight (the pull of gravity on that mass, in newtons). On the Moon you would weigh about one-sixth as much, but your mass would be the same. This distinction is Key Stage 3 content. In Year 5 it is enough to know that gravity pulls things down and that force meters measure pulls in newtons.
Why Things Fall at the Same Rate
This is profoundly counterintuitive. A hammer and a feather dropped from the same height hit the ground at the same time (if air resistance is removed, as famously demonstrated by Apollo 15 astronauts on the Moon).
Children's intuition says heavy things fall faster. After all, if you drop a bowling ball and a table tennis ball, the bowling ball lands first. But that's because of air resistance, not gravity. In a vacuum, they'd fall at identical speeds.
Why? Gravity pulls harder on the heavier object, but the heavier object is also harder to get moving, and the two effects cancel out exactly. The full explanation, with Newton's laws, comes in Key Stage 3.
Common misconception: Many children think heavy objects fall faster because gravity "pulls harder" on them. It does, but a heavier object needs a bigger pull to speed up by the same amount, so they fall together.
Air Resistance: The Invisible Force
Air resistance (also called drag) is the force that opposes motion through air. It's why a feather falls more slowly than a hammer on Earth, why parachutes work, and why cars and planes are streamlined.
How Air Resistance Works
As an object moves through air, it collides with air molecules. These collisions create a force opposing the direction of motion. The faster the object moves, the more collisions per second, and the greater the air resistance.
Air resistance depends on:
- Speed: Faster movement = more air resistance
- Surface area: Larger surface facing the direction of motion = more air resistance
- Shape: Streamlined shapes reduce air resistance by allowing air to flow around smoothly
Extension: Terminal Velocity (This Comes Later, in Key Stage 3)
When a skydiver first jumps from a plane, they accelerate downward due to gravity. As their speed increases, air resistance increases. Eventually, air resistance upward equals gravitational force downward. The forces are balanced, so the skydiver stops speeding up and falls at a steady speed. This is called terminal velocity.
When the parachute opens, surface area dramatically increases, so air resistance becomes much greater than gravity. The skydiver slows (negative acceleration) until reaching a new, much slower terminal velocity where the forces balance again.
Year 5 children don't need the term "terminal velocity" or the idea of balanced forces. It is enough to know that a bigger parachute means more air resistance and a slower fall.
Water Resistance: Air Resistance's Aquatic Cousin
Water resistance works on the same principles as air resistance but is much stronger because water is denser than air. This is why streamlining matters even more for boats and submarines, and why swimming is more tiring than running at the same speed.
Children should understand:
- Water resistance opposes motion through water, just as air resistance opposes motion through air
- Streamlined shapes reduce water resistance
- Surface area and speed affect water resistance
- Fish, dolphins, and submarines are streamlined to reduce water resistance
Common misconception: Children sometimes think water resistance only acts on objects moving through water, not objects floating on the surface. In fact, boats experience water resistance as they move through water, which is why hull shape matters for speed.
Friction: The Force That Makes Movement Possible
Friction is the force that opposes motion between two surfaces in contact. It's often taught as something that "slows things down," which gives children the impression it's purely negative. In reality, friction is essential. Without it you couldn't walk, cars couldn't drive, and nothing would stay on a sloping shelf.
How Friction Works
When two surfaces are in contact, even smooth-looking surfaces have microscopic bumps and irregularities. When surfaces try to slide past each other, these irregularities catch and resist movement. This is friction.
Friction depends on:
- Surface texture: Rougher surfaces create more friction (sandpaper on wood) than smoother surfaces (ice on metal)
- Force pressing surfaces together: Heavier objects create more friction because they press surfaces together more firmly
- Not speed: This surprises many children, but friction between solid surfaces is roughly the same whether you slide slowly or quickly
Friction Is Essential
Help your child appreciate that friction is useful:
- Walking: Your foot pushes backward against the ground; friction pushes you forward. On ice (low friction), you slip
- Braking: Friction between brake pads and wheels slows vehicles
- Grip: Friction holds objects in your hand, keeps pictures on walls, prevents books sliding off tilted desks
- Writing: Friction between pencil and paper leaves graphite marks
Sometimes we want less friction. Oil on a bicycle chain, wheels instead of sliding, and polished surfaces all reduce it.
Mechanisms: Getting More From Less
The final component of Year 5 forces is understanding how levers, pulleys, and gears allow a small force to have a large effect.
Levers
A lever is a rigid bar that pivots around a fixed point (the fulcrum). Depending on where the fulcrum is positioned relative to the effort (force you apply) and load (object you're moving), you can multiply force.
Simple examples children understand:
- Seesaw: move the fulcrum closer to the heavy person to balance a lighter person
- Crowbar: the fulcrum is very close to the load, so a small effort creates a large lifting force
- Bottle opener: short distance from fulcrum to load, long distance from fulcrum to effort
The key principle: the further the effort is from the fulcrum (relative to the load), the greater the force multiplication. You trade distance moved for force gained.
Pulleys
Pulleys are wheels with grooved edges that rope runs through. They can change the direction of a force (pulling down lifts something up) and, when multiple pulleys are combined, reduce the effort needed.
- Single fixed pulley: Changes direction but doesn't reduce effort (flagpole)
- Movable pulley: Reduces effort to half (but you pull twice the distance)
- Multiple pulleys: Each additional pulley further reduces effort required
Gears
Gears are toothed wheels that interlock. When one turns, it turns the other. Differently sized gears change the force and speed:
- Large gear turning small gear: Increases speed but reduces force (high gear on a bicycle: faster but harder to pedal uphill)
- Small gear turning large gear: Decreases speed but increases force (low gear on a bicycle: slower but easier to climb hills)
Year 5 children should understand these concepts practically rather than mathematically. They should be able to identify mechanisms and explain generally how they make tasks easier, not calculate mechanical advantages.
Common Misconceptions About Forces
Teachers meet these misconceptions about forces in most classes:
Misconception 1: Heavy Objects Fall Faster
This is the most persistent misconception. Children observe that a brick falls faster than a feather and conclude mass affects falling speed. Address this by explaining that air resistance causes the difference, and showing videos of vacuum chamber experiments where objects fall at identical rates.
Misconception 2: Forces Are Only Pushes and Pulls You Can Feel
Many children don't initially recognise gravity, air resistance, and friction as forces because they're always present and often invisible. Emphasise that forces are any pushes or pulls, whether you apply them consciously or not.
Misconception 3: Moving Objects Must Have a Force Acting on Them
Children often think a ball rolling along the ground has a force pushing it forward. In reality, once released, nothing pushes it forward; friction and air resistance slow it until it stops. The idea that movement needs a constant push feels natural but is wrong. The rule behind this (Newton's First Law) is taught in Key Stage 3. For Year 5 it is enough to say: the ball slows because forces act against it.
Misconception 4: Friction Always Opposes Motion
This is subtle. Friction opposes relative motion between surfaces, which isn't quite the same as opposing motion generally. When you walk, friction between foot and ground actually enables forward motion by preventing your foot slipping backward. The friction opposes your foot's tendency to slip, not your body's forward motion.
Practical Investigations to Support Learning
Forces comes alive through hands-on investigation. Try these at home:
Investigation 1: Testing Air Resistance
Equipment: Two identical pieces of paper
Method: Drop both from the same height simultaneously. One flat, one crumpled into a ball. Which lands first? Why?
Learning: Same mass, same gravity, but different air resistance due to surface area. The crumpled ball has less air resistance so falls faster.
Extension: Make paper helicopters with different blade sizes and see how falling speed varies.
Investigation 2: Parachute Design
Equipment: Plastic bags, string, small weights (like plasticine), scissors
Method: Create parachutes of different sizes and shapes. Test which falls most slowly. Graph surface area against falling time.
Learning: Larger surface area increases air resistance, slowing descent. Demonstrates how parachutes work and relationship between surface area and air resistance.
Investigation 3: Friction on Different Surfaces
Equipment: Toy car, ramp, different surface materials (carpet, wood, sandpaper, plastic, foil)
Method: Roll car down ramp onto different surfaces. Measure how far it travels on each before stopping.
Learning: Different surface textures create different friction. Rougher surfaces (carpet, sandpaper) stop the car more quickly than smooth surfaces (plastic, wood).
Investigation 4: Investigating Levers
Equipment: Ruler, pencil (fulcrum), small weights or coins
Method: Balance ruler on pencil. Place weight on one side. Experiment with moving fulcrum position to find where a single coin on the other side balances the weight.
Learning: Changing fulcrum position changes how much force is needed to balance a load. Further from fulcrum = less force needed but greater distance moved.
Investigation 5: Streamlining Experiment
Equipment: Plasticine, water in a deep container or bathtub, stopwatch
Method: Make plasticine shapes of the same mass: a sphere, a streamlined shape, a flat disc. Drop each from same height into water. Time how long each takes to reach the bottom.
Learning: Streamlined shapes experience less water resistance and fall faster despite identical mass.
Supporting Children Who Struggle
Forces is abstract, requiring children to think about invisible influences on visible effects. If your child finds this challenging:
Make forces visible: Draw arrows to show which way each force pushes or pulls, and how big it is.
Connect to personal experience: "Remember when you ran on the wet tiles by the pool and slipped? That's low friction. How is walking on carpet different?"
Use analogies carefully: Analogies help but can mislead. "Air resistance is like swimming through water" works until children think air is as dense as water.
Address misconceptions directly: If your child says "heavy things fall faster", don't simply say "no". Drop a heavy book and a light book together and let them see.
Build gradually: Master gravity before adding air resistance. Understand friction before introducing mechanisms. Layering complexity helps prevent overwhelm.
Connecting to Real-World Applications
Children engage more when they see relevance. Connect forces to:
Sports: Why sprinters and cyclists wear tight clothing (less air resistance), why a puck slides so far on ice (less friction)
Transport: Why cars are streamlined (reduce air resistance for fuel efficiency), why tyres have tread (increase friction for grip), why planes need powerful engines (overcome gravity and air resistance)
Everyday tasks: Why bicycle gears help on hills (gear mechanisms), why door handles are at the edge opposite the hinges (a lever with the fulcrum at the hinge)