FORCES GCSE PHYSICS 2 Flashcards
What type of vector is force?
vector quantity
What are some examples of vector quantities?
force, velocity, displacement, acceleration, momentum
What are vector quantities?
have magnitude and direction
What are scaler quantities?
only have magnitude and no direction
What are some examples of scaler quantities?
speed, distance, mass, temperature, time
How are vectors represented?
by an arrow
the length of the arrow shows the magnitude and direction of the arrow shows the direction of the quantity
What is force?
a force is a push or pull on an object that is caused by interacting with something
What are the two types of forces?
contact and non contact forces
What is a contact force?
when two objects have to be touching for a force to act
What is a non contact force?
if the objects do not need to touching for the force to act
What is an interactional pair?
is a pair of forces that are equal and opposite and act on two interacting objects (basically newtons third law)
What is the sun and the earth attracted to eachother by?
- by gravitational force
- this is a non contact force
- an equal but opposite force of attraction is felt by both the sun and the earth
What is mass?
-the amount of “stuff” in an object
- for any given object this will have the same value anywhere in the universe
What is weight?
- the force acting on an object due to gravity (the pull of gravitational force on the object)
When is gravitational field strength the easiest?
- its stronger the closer to are to the mass causing the field
- and stronger for larger masses
What does the weight of an object depend on?
- depends on the strength of the gravitational field at the location of the object
- the weight of an object changes with its location
How is weight measured?
- forced measured in newtons
What is the equation for weight?
weight= mass x gravitational force
What is a single force?
- resultant force
When does a force need to be applied?
- to make something move
What happens when you push something along a rough surface?
- you are doing work against frictional forces
- energy is being transferred to the kinetic energy store of the object because it starts moving
- some is transferred to thermal energy stores due to friction
- this causes the temp of the object to increase
How can you find out how much work is done?
work done= force x distance
What happens if all of the forces acting on an object?
- they give a resultant force of zero
-the object is in equilibrium
How do forces act?
- horizontally, vertically, awkward angles
How do you calculate elastic potential energy?
0.5 x spring constant x extension squared