The period of time when a place on Earth is facing the Sun and has daylight.
Happens when a part of the Earth faces the Sun.
The sky is bright because of sunlight.
Plants and animals are usually active during the day.
Energy cannot be created or destroyed it can only be changed from one form to another.
Energy cannot be created.
Energy cannot be destroyed.
Energy can change from one form to another.
Energy changing form is when energy transfers from one type to another without being created or destroyed.
Energy can change from one form to another.
Energy is never created or destroyed.
This is called energy transfer.
Energy transfer is how energy moves from one object or place to another.
Energy moves from one place to another this is called energy transfer.
Energy can change form while moving.
Energy is never lost, just transferred or transformed.
Kinetic energy is the energy that an object possesses due to its motion. Any object that is moving whether fast or slow has kinetic energy, and the amount of kinetic energy depends on how heavy the object is and how fast it is moving.
Only moving objects have kinetic energy.
Objects with more speed have more kinetic energy.
Objects with more mass have more kinetic energy.
Thermal energy is the energy an object has because its particles are moving, and it is felt as heat.
A hot object has lots of thermal energy.
The air or nearby objects are cooler.
Thermal energy moves from hot to cold.
Energy is the ability to do work or cause change. It makes things move, heat up, light up, make sound, or change shape.
Without energy:
Nothing can move.
No light.
Chemical energy is the energy stored in substances that can be released during a chemical reaction.
In food.
In fuels.
In batteries.
Using energy is when energy is used to make something move, work, change, or happen.
1. Using energy makes things move, work, or change.
2. Energy comes from food, fuel, electricity, sun, wind, and water.
3. Renewable energy never runs out.
The pattern of falling is the regular way in which objects move downward under the influence of gravity, usually speeding up at first and sometimes reaching a constant speed due to air resistance.
Falling starts when gravity pulls an object down.
The longer it falls, the faster it goes.
Gravity pulls equally on all objects.
Air resistance is the force of air pushing against a moving object.
When an object moves, it hits air particles.
The air pushes back against the object.
This push opposes motion.
Friction is a force that opposes the motion of two surfaces that are in contact with each other.
Static friction – keeps an object from moving.
Sliding friction – slows things sliding.
Rolling friction – slows rolling objects.
Weight is the pulling force of gravity on an object.
Gravity pulls everything towards the Earth
That pulling force is called weight
Weight depends on gravity
A force is a push or a pull that can move something, stop it, or change its shape.
Big forces are strong pushes or pulls.
A car engine pushing a car forward.
A force is a push or a pull that can change the motion, shape, or direction of an object.
A force arrow is a diagram arrow used to show a force acting on an object.
It shows:
where the force acts
Definition:
Electricity is a type of energy caused by the movement of tiny particles called electrons.
Examples:
When you switch on a bulb, electricity makes it glow.
A fan spins because electricity powers its motor.
Televisions and computers work using electricity.
Definition
Force is a push or pull on an object that can make it move, stop, or change direction.
Example
Pushing a door, pulling a rope, or kicking a ball are all examples of force.
Definition
An electromagnet is a magnet that works only when electricity flows through it
Examples
Electric bell
Fan motor
Speakers
Definition
Gravity is a natural force that pulls all objects toward each other
Examples
An apple falling from a tree
people staying on the ground instead of floating away
Rain drops falling from the sky
Definition
Thermal expansion is when a material becomes bigger on heating and smaller on cooling.
Examples
Bridges have small gaps so they can expand in heat.
Railway tracks have gaps to stop bending in hot weather.
Jar lids loosen when heated because the metal expands.
Surface tension is like thin skin on liquid.
It is caused by molecules pulling each other.
Molecules inside are pulled in all directions.
Molecules on the surface are pulled inward.
This makes the surface tight.
Small insects can walk on water.
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