Measuring motion and types of forces Flashcards
(24 cards)
what happens when forces and balanced/ unbalanced?
balanced: object is stationary/ moving with a constant speed
unbalanced: acceleration
weight forces
force due to gravity
e.g. weight on moon is different than on earth
reaction force
when an object is placed on a surface, the surface will push back on the object
drag or air resistance forces
when a fluid (gas or liquid) pushes back on the object moving through the fluid
friction forces
a force that opposes motion and tries to stop two surface from slipping over each other
upthrust forces (causes buoyancy)
when an object is placed in a fluid it will experience a force upwards
thrust forces
drives an object forward or backward
e.g. produced by a jet engine or propellers of an aircraft
magnetic forces
attracts a magnetic material to a magnet or can cause two magnets to repel each other
electrostatic forces
between charged particles or charged object
nuclear strong force forces
holds together the particles inside a nucleus
lift forces
enables things to fly
e.g. birds, planes, frisbees
tension forces
when a material is stretched, the material will pull back on the object stretching it in an attempt to return to its original size
unbalanced force synonym
net force/ resultant force
scalar vs vector
a scalar is a quantity that has magnitude (size) only, while a vector has both magnitude and direction
distance: unit, scalar or vector, definition
(m) scalar, total number of meters travelled by a body
displacement: unit, scalar or vector, definition
(m) vector, straight line distance of a body from its starting point
c in a + b + c, degrees (starting from north), compass (e.g. 5km 36.9o NE)
speed: unit, scalar or vector, definition
(m/s) scalar, distance travelled per second
average speed equation
average speed = total distance/ total time
velocity: unit, scalar or vector, definition
(m/s) vector, speed in a certain direction
velocity equation
velocity = displacement/ time
acceleration: unit, scalar or vector, definition
(m/s/s), vector, rate of change of velocity
average acceleration equation
average acceleration = change in velocity/ time
acceleration/ deceleration unit
acc: m/s^2
dec: -m/s^2
what is friction
