Flashcards in Physics Paper 2 GCSE Deck (78)
What does scalar quantities only have?
What does vector quantities have?
magnitude and an associated direction
How is vector quantities represented?
What does the length of the vector quantities arrows show?
What does the direction of the arrow representing vector quantities show?
direction of the vector quantity
What is a force?
a push or a pull that acts on an object due to the interaction with another object
What are the forces between objects?
contact forces - the objects are physically touching
non-contact forces - the objects are physically seperated
What is weight?
force acting on an object due to gravity
What does the weight of an object depend on?
gravitational field strength at the point where the object is
How do you calculate weight?
mass x gravitational field strength
What is the gravitational field strength of the earth?
How do you calculate work done?
force x distance
What is one joule in newton-metre?
What does work done against the frictional forces acting on an object cause?
rise in the temperature of the object.
To change the shape of an object what must happen?
more than one force has to be applied – this is limited to stationary objects only
Whats elastic deformation?
elastic deformation is a change in shape of a material at low stress that is recoverable after the stress is removed.
Whats inelastic deformation?
a deformation occurring when a material is stressed beyond its elastic limit.
What is the extension of an elastic object like compared to the force applied?
The extension of an elastic object, such as a spring, is directly proportional to the force applied, provided that the limit of proportionality is not exceeded.
How do you calculate force?
spring constant x extension
What type of energy is stored in a spring?
elastic potential energy
How do you calculate elastic potential energy?
0.5 x spring constant x (extension)2
How do you calculate moment of a force?
force x distance
How can you calculate pressure?
force normal to a surface/area of that surface
height of the column x density of the liquid x gravitational field strength
A partially (or totally) submerged object experiences what?
a greater pressure on the bottom surface than on the top surface. This creates a resultant force upwards. This force is called the upthrust.
What does displacement include?
Displacement includes both the distance an object moves, measured in a straight line from the start point to the finish point and the direction of that straight line. Displacement is a vector quantity.
What is speed?
Speed does not involve direction. Speed is a scalar quantity
What is a typical value of someone walking?
What is a typical value of someone running?
What is a typical value of someone cycling?