Year 7 Spr1 Forces and waves Flashcards
A force
Something that can push or pull
Gravity
Humans have always wanted to fly, if gravity you would be able to float. Nearly like flying. This is a pushing force.
Friction
Friction hold back the movement of a sliding object. If this force wasn’t here you’d just fall over.
Reaction force
The force that keeps gravity from digging you into the ground it is also a pushing force
Air resistance
The force that makes it so when your skydiving you dont go at an infinite amount of speed. If this force wasn’t here skydiving would be a way to kill yourself
Water resistance
Its exactly like air resistance but for water. Water resistance is resistance that makes it so you couldn’t just go ridiculously fast in water
Magnetic force
Magnets exert a magnetic force onto other magnets or objects, if that material happens to be magnetic it will be sucked towards the magnet. This force is a non-contact force
Electrostatic force
If you rub a ballon on paper you cam eventually pick up the paper, that is what an electrostatic force does. This force is a non-contact force
Hookes law
This law says that if you double the force you double the extension of a spring or something like a spring.
Transparent
An object that lots most light through
Translucent
An object that lets a bit of light through
Opaque
An object that doesnt let light through
Reflection
An object that light bounces off
Refraction
An object that bends light
Lens
The bit in your eye that refracts light onto your retna
Iris
The coloured bit of your eye that help to move the pupil to expand and shrink
Cornea
The protective layer around the eye
Retina
The bit at the back of the eye that picks up light and puts it into images
Pupil
The black bit in the middle of your eye that expands to let it light and shrinks to let in less light
Compress
When you squish an object
Extension
When you make stretch an object
Elastic limit
If a spring is stretched more than its elastic limit it wont go back to its original form
Balanced force
When a push and pull force are equal
Unbalanced force
When one push or pull force is stronger than another push or pull force
