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9702 CIE AS LEVEL PHYSICS
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9702 CIE AS LEVEL PHYSICS
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9702 CIE AS LEVEL PHYSICSDerived Units - correct answer-Some combination of the base units. The base units may be
multiplied together or divided by one another, but never added or subtracted.
Homogeneous Units - correct answer-When each term has the same base units, the
equation is said to be homogeneous or 'balanced'.
Scalar - correct answer-A quantity that has magnitude/size
Vector - correct answer-A quantity that has magnitude/size and direction
Accuracy - correct answer-How close a reading is to its true value. When readings are
accurate, the peak / average value moves towards the true value
Precision - correct answer-Smallest change in value that can be measured by an instrument.
OR Spread of values / measurements (scatter between each data is relatively small/ lines
are closer together / sharper peak)
Random errors - correct answer-Readings have positive and negative values around the
peak value / values are scattered / wide range. To reduce errors, take several readings to
get an average value.
Systematic Error - correct answer-The average / peak is not the true value / the readings are
not centered around the true value. Look/check for zero error to avoid systematic error.
Uncertainty - correct answer-The range of value within which a measurement is likely to be
in.
Acceleration (vector) - correct answer-Rate of change of velocity.
Displacement (vector) - correct answer-is the straight line distance between start and finish
points (in that direction) / minimum distance
Distance (scalar) - correct answer-is the actual path traveled
Free Fall - correct answer-The downward motion of an object under the influence of force of
gravity with a constant acceleration (g = 9.81 ms-2).
Projectile motion - correct answer-Objects acted upon by a force with a vector perpendicular
to its horizontal velocity. Assume zero frictional forces. Trajectory of the object will result in a
parabola.
Speed (scalar) - correct answer-Distance traveled per unit time taken
, Terminal velocity - correct answer-Constant speed of object when resultant force is zero due
to large air resistance.
Velocity (vector) - correct answer-Rate of change of displacement
Conservation Of Momentum - correct answer-Total momentum of (an isolated) system (of
interacting bodies) remains constant, provided there are no resultant external forces (e.g.
friction)
Elastic Collisions - correct answer-Total momentum and total Kinetic Energy of a system is
conserved. Relative speed of approach is equal to the relative speed of separation
Force - correct answer-It is defined as the rate of change of momentum of a body
Impulse - correct answer-It is the product of a force & the time during which the force is
applied.
Inelastic Collisions - correct answer-Total momentum of a system is conserved, but the total
Kinetic Energy is not conserved. Speed before impact is not equal to speed
Linear Momentum - correct answer-Product of an object's mass & velocity, with its direction
always being the same as the direction of velocity.
Mass - correct answer-It is a measure of inertia of a body or the property of a body that
resists change in motion
Newton's 1st Law - correct answer-A body remains at rest or constant velocity unless acted
on by a resultant (external) force
Newton's 2nd Law - correct answer-The (resultant) force is proportional to the rate of change
of momentum
Newton's 3rd Law - correct answer-If one body exerts a force on another, it will experience a
force by the other body, which is equal in magnitude & opposite in direction. Both forces are
of the same kind.
Weight - correct answer-Weight is the force due to the gravitational field
Centre Of Gravity - correct answer-The point on an object at which the entire weight of the
body seemingly acts. It is the point at which the Earth actually applies the pull of gravity.
Density - correct answer-Amount of mass per unit volume of a substance.
Equilibrium - correct answer-Net / resultant force and moment is zero (OR sum of clockwise
moments = sum of anticlockwise moments). If the triangle of forces is 'closed' then there is
no resultant force and the object is in equilibrium.
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