Forces Flashcards
what is a scalar quantity?
has a magnitude only
what is an example of a scalar quantity?
temperature, speed, energy
what is a vector quantity?
has a magnitude and a direction
what is an example of a vector quantity?
displacement, momentum, acceleration, velocity
what represents vector quantites?
an arrow
what does the length of a vector arrow show?
shows the magnitude
what does the direction of a vector arrow show?
the direction the vector quantity is acting
what quantity is force?
vector
what is a contact force?
forces that act when two objects are physically touching
what is a non contact force?
forces that can act from a distance/when they are not touching
what are examples of a contact force?
friction, air resistance, tension, upthrust, normal contact force
what are examples of non contact forces?
gravitational force, electrostatic force, magnetic force
what is gravity?
a force of attraction between all masses, the force of gravity close to Earth is due to the gravitational field around the planet
what is the mass of an object?
the mass of an object is related to the amount of matter it contains. its constant
what is the weight of an object?
force acting on an object due to gravity
what does the weight of an object depend on?
depends on the gravitational field strength where the object is and is directly proportional to its mass
what is the equation for weight?
weight(N) = mass(kg) x gravitational field strength(n/kg)
what is a resultant force?
when more than one force acts on an object, these forces can be seen as a single force that has the same effect as all the forces acting together
what is work done?
when a force causes an object to move and it requires energy to move
what is the workdone equation?
workdone = force x distance
what is elasticity?
the ability to stretch or compress an object
what is elastically deformation?
if a object returns to its original shape after the forces have been removed
what is inelastically deformation?
if the object does not return to its original shape after the forces have been removed
what is newtons first law?
if a resultant force is stationary or a moving objects resultant force is 0, the object will either remain stationary or remain at constant speed
what is newtons second law?
the second law states that the acceleration of an object is dependant on the force acting upon the object and the mass of the object
what is the equation for resultant force?
resultant force (N) = mass (kg) x acceleration (m/s^2)
what is newtons third law?
when two objects interact with each other, they will exert an equal and opposite forces on each other
what is inertia? (HT)
the tendency for objects to continue in the same state of motion
what is the equation for inertial mass? (HT)
inertial mass = force / acceleration
