AQA A Level Physics Mechanics UPDATED Actual Exam Questions and CORRECT Answers
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Course
AQA A Level Physics Mechanics
Institution
AQA A Level Physics Mechanics
AQA A Level Physics Mechanics
UPDATED Actual Exam Questions and
CORRECT Answers
Difference between a scalar and a vector - CORRECT ANSWER- vector has magnitude
(size) and direction, whereas scalar only has magnitude (size).
Examples of scalars - CORRECT ANSWER- speed, mass, time, energy, pow...
AQA A Level Physics Mechanics
UPDATED Actual Exam Questions and
CORRECT Answers
Difference between a scalar and a vector - CORRECT ANSWER- ✔✔vector has magnitude
(size) and direction, whereas scalar only has magnitude (size).
Examples of scalars - CORRECT ANSWER- ✔✔speed, mass, time, energy, power
Adding perpendicular vectors by calculation - CORRECT ANSWER- ✔✔draw vectors as a
right angled triangle
use pythagoras' theorem to find magnitude of resultant vector
use trigonometry to calculate the angle of resultant vector (sin=o/h; cos=a/h; tan=o/a)
Adding vectors
by scale drawing - CORRECT ANSWER- ✔✔write down scale eg 1cm=2N
draw vectors to correct length and angle to each other "tip to tail"
add the resultant vector line (from original tail to free tip)
measure length and angle of resultant vector
convert length into appropriate quantity (using scale) to find magnitude of resultant vector
Resolving vectors into two perpendicular components - CORRECT ANSWER- ✔✔
Resolving components along, and perpendicular to, an inclined slope - CORRECT
ANSWER- ✔✔slide down slop = sine
force dow slope = sintheta
, Conditions for equilibrium of two or three coplanar forces acting at a point - CORRECT
ANSWER- ✔✔total resultant force equals zero
or
if the vectors representing the forces are added together they will form a closed triangle.
Two conditions for a body to remain in equilibrium - CORRECT ANSWER- ✔✔1. resultant
force acting on body is zero
2. resultant moment about any point is zero
object could be stationary OR travelling at constant velocity
Definition of the moment of a force about a point - CORRECT ANSWER- ✔✔force
multiplied by the perpendicular distance from the point to the line of action of the force.
Units of moment - CORRECT ANSWER- ✔✔Nm
Principle of Moments - CORRECT ANSWER- ✔✔in equilibrium, the sum of the clockwise
moments about a point equals the sum of the anticlockwise moments.
Definition of a couple - CORRECT ANSWER- ✔✔A pair of equal and opposite coplanar
forces
Definition of the moment of a couple - CORRECT ANSWER- ✔✔(one) force multiplied by
the perpendicular distance between the lines of actions of the two forces.
Definition of centre of gravity - CORRECT ANSWER- ✔✔point in a body through which
weight appears to act
(an object will balance if supported at its centre of gravity)
Definition of centre of mass - CORRECT ANSWER- ✔✔point in a body where the resultant
moment from an applied force is zero
(in a uniform gravitational field the centre of mass is at the same point as the centre of
gravity)
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