Force and Motion Flashcards
what is stopping distance
The distance taken for you to see a hazard, to think about how to react and to stop your vehicle
stopping distance comprises what
thinking distance and braking distance
what is thinking distance
The time taken and the distance travelled when you react to a hazard
what is braking distance
The time taken for your brakes to stop you
what factors affect thinking distance
drugs and alcohol, attention, cognitive function, how tired you are, speed, age
what factors affect braking distance
size/quality of brakes, speed, road surface, mass, quality of tyres, grips
what are scalars
quantities which only have a size/magnitude
what are vectors
quantities which have magnitude and direction
List seven scalars
distance, speed, density, energy, area, change, time
List seven vectors
displacement, velocity, acceleration, momentum, force, current, moment
what are the applied forces
push and pull
in what direction does frictional force act
in the opposite direction to the motion
masses attract other masses due to what force
gravitational force
at what angle does normal reaction force act when an object rests on a solid
90°
what is normal reaction force to the force of the object pushing on the surface
equal and opposite
what is air resistance called in liquids
drag
What is drag affected by
The objects shape and the fluid it travels in
when does thrust occur
when mass is pushed out the back of something causing the object to move
what does mass depend on
The number and type of atoms in an object
what is weight
The force of attraction an object feels towards another object
State the relationship between weight, mass and gravitational field strength
Weight = mass x gravitational field strength
w=mg
what three factors affect terminal velocity
viscosity of the fluid, profile of the shape and weight
how does the viscosity of the fluid affect terminal velocity
The thicker the fluid the higher the drag
how does the profile shape affect terminal velocity
if you decrease the profile of the shape you decrease the drag… this leads to a greater terminal velocity
