P10 Glossary Flashcards
What does braking distance mean?
the distance travelled by a vehicle during the time it takes for its brakes to act.
What does conservation of momentum mean?
in a closed system, the total momentum before an event is equal to the total momentum after the event. Momentum is conserved in any collision or explosion, provided no external forces act on the objects that collide or explode
What does directly proportional mean?
a graph will show this if the line of best fit is a straight line through the origin.
What does elastic mean?
a material is elastic if it is able to regain its shape after it has been squashed or stretched.
What does extension mean?
the increase in length of a spring (or a strip of material) from its original length.
What does gravitational field strength, g mean?
the force of gravity on an object of mass 1 kg (in newtons per kilogram, N/kg). It is also the acceleration of free fall.
What does inertia mean?
the tendency of an object to stay at rest or to continue in uniform motion.
What does limit of proportionality mean?
the limit for Hooke’s law applied to the extension of a stretched spring.
What does mass mean?
the quantity of matter in an object – a measure of the difficulty of changing the motion of an object (in kilograms, kg).
What does momentum mean?
this equals mass (in kg) x velocity (in m/s).
What does Newton’s second law of motion mean?
the acceleration of an object is proportional to the resultant force on the object, and inversely proportional to the mass of the object.
What does stopping distance mean?
the distance travelled by the vehicle in the time it takes for the driver to think and brake.
What does terminal velocity mean?
the velocity reached by an object when the drag force on it is equal and opposite to the force making it move.
What does thinking distance mean?
the distance travelled by the vehicle in the time it takes the driver to react.
What does weight mean?
the force of gravity on an object (in newtons, N).
