Forces (Yr_7) Flashcards
What is force measured in?
Newtons(N)
How are forces measured?
Spring balances
What are the two main types of forces?
Contact and non-contact
What are balanced forces and what do they look like in everyday life?
Balanced forces are when two forces are equal in strength. Most things in everyday life are balanced as balanced forces don’t move.
What is net force?
Net force is the total of all the forces.
What are the key things to remember when drawing force diagrams?
- direction of the arrows show the direction of the fence
- the length of the arrow indicates how strong the force is
- arrows need to be labelled to show agent and the receiver
What is friction?
- contact force
- it happens when two objects rub against each other
- other types of friction are air resistance and drag
What is gravitational field?
A region in space where an object of any mass experiences a force
What is an electric field?
A region in space where a charged or neutrally charged object experiences a force.
What is a magnetic field?
A region in space where a ferromagnetic material experiences a force.
What is the difference between mass and weight?
Mass is a measure of how much matter an object contains therefore it doesn’t change. It is measured in kilograms, Weight is a measure of the force on an object pushing down on the ground due to gravity. It is measured in Newtons and changes from planet to planet.
How do buoyancy and gravity work against each other?
When an object of mass goes into the water, gravity pull sit down while buoyancy pushes it back up. Objects float or sink depending on which force is stronger.
