Science Flashcards
What is Mass?
Mass is the amount of matter in a object.
To understand what Weight is, whhat do you need to think about?
Forces of Gravity
What do we measure weight with?
Newton (N)
Who was newtons named after?
Newtons are named after a person called Sir Isaac Newton.
Who Sir Isaac Newton?
A scientist who lived in England 400 years ago. He was the first person to explain abt what forces are.
What is the forces that pulls objects towards the Earth?
Weight
How many newtons forces does one kg of mass has on Earth?
10
How does forces act? How does it works?
It act in different ways and in pairs
How can you explain a balanced forces?
When both forces on an object are the same size, the forces are balanced
How do you say when a forces are unbalanced and one force is grater than the other?
Net Force
What can forces do?
Forces can makes things move. Forces can also speed up moving objects. They can also slow down moving objects or makes them stop moving. It can change an object’s direction of movement. It can also change the shape of an object
What does exert mean?
to use/ to bear a force
What is needed to make objects move or to stop them moving?
Force
What does moving object has?
Energy
what is the amount of energy transferred to an object to makes it move?
Work
What is friction?
Friction is a force which tries to stop things sliding past one another.
How is friction caused?
When two surfaces rub together
what can friction act and cannot make?
it only acts on moving objects and cannot make object move
Friction change the energy of moving object into what?
Into heat energy
When does it change into heat energy?
When the object slow down
How is friction useful?
Friction can be useful as it helps objects to grip on surfaces
How can friction be a problem?
It makes object wear out and get hot
What kind of surface are greater for frictional force? and not worse for it?
Rough surface is great for frictional force. Smooth surface is not great for frictional force.
Frictional force is bigger over —— than ——.
large surface than small surface
