forces Flashcards
what is a scalar quantity
a scalar quantity only has magnitude (size)
what is a vector quantity
a vector quantity has both direction and magnitude
what is the relationship between weight and mass
they are directly propotional
what is the center of mass
the point where the weight of an object is concentrated
what is elastic deformation
when an object has two or more forces applied to it in order to change its shape and then the object returns back to normal after the forces are removed
formula for force with spring constant and extension
force (m) = spring constans (N/m) * extension (m)
what is work
work is the transfer of energy by applying a force
what is the formula for work
work (J) = force (N) * distance (m)
what is a moment
the turning effect of a force
what is the formula for calculating a moment
moment (Nm) = force (N) * distance from pivot (m)
what is the functions of gears and levers
to act as a force multipliers
what is the formula for pressure
pressure (pascals/pa) = force exerted at normal to a surface (N) * area of that surface (m²)
why do objects float in liquids
objects float when the upthrust is equal to the objects weight or if the density of the
how can you calculate upthrust
the size of the upthrust is equal to the weight of the water displaced by the object
what is the formula for pressure of a column of liquid
pressure (pascals) = height of column * density of liquid (kg/m³) * gravitational feild strength
what happens to the velocity of the car if it is moving in a circle at a constant speed
its direction will be constantly changing so the velociy will also be constantly changin as it is a vector quantity
what does the gradient in a distance time graph show
the speed
what is the equation of acceleration
change in velocity / time (s)
what is newtons first law of motion
if the resultant forces acting on an object are 0 then the object will remain stationary or keep moving at a constant velocity
what is newtons second law of motion
the acceleration of an object is directly proportional to the resultand force acting on the object and inversely proportional to the mass of the object
what is the stopping distance
the distance travveled from when the driver spots an obstruction to when the driver stops
what is the thinking distance
the distance travelled by the car during the drivers reaction time
what is the braking distance
the distance travelled from when the driver applies the brakes to when it stops
what is the formula for momentum
momentum (Kgm/s) = mass * velocity
what is the formula for force regarding time and change in momentum
force (N) = change in momenum (Kgm/s) / time (s)
