Physics Flashcards
Explain why sound travels fastest in solids.
Describe how to convert a s-t graph to a v-t graph
y coordinate of a v-t graph = gradient of a s-t graph (e.g. increasing grad of s-t, vel. increases)
(For reflection) When mirror rotates x degrees, the normal rotates ? degrees
(For reflection) When mirror rotates x degrees, (angle of incidence + angle of reflection) increases by ? degrees
When air pressure
List out all base quantities, their SI unit and symbols (6 of them, exclude luminous intensity)
Define derived quantities
List out all factors n their respective prefix and symbol (4 multiples, 5 sub-multiples)
State size of an atom n size of the earth
State the 4 measuring instruments, the length they can measure and their precision in cm
How to minimise errors while using a metre rule (4 ways)
- Avoid zero errors.
- Take care to line up the end of the object with the zero of the scale. - Avoid parallax errors.
- Position your eye vertically above the scale such that your line of sight is perpendicular to the rule
marking.
3.Taking several readings and calculating the average
4.due to wear and tear on the ends of a ruler, it will be better to measure from another point and subtract it from the final reading instead of beginning at 0.0 cm.
State what a pendulum is affected by n how so, and what it isnt affected by
-The period of a pendulum is affected by its length. The larger the length, the longer the period.
-The period of a pendulum is not affected by the mass of the pendulum bob.
Define scalar and vector quantities and their examples
Deleceration happens when v and a are in ?
Define distance and displacement
Distance= Total length covered by a moving object regardless of the direction of motion.
Displacement=Distance measured in a straight line in a specified direction.
Define instantaneous speed/vel.
Speed (or velocity) at a particular instant.
how to calculate speed of a ticker tape
the time taken for each interval (derived by e.g. 1s/50 if f=50 dots per second) x no. of intervals= total time.
-then use std triangle to find speed of ticker tape
Acceleration occurs when..
-a change in speed
-a change in direction
-or both