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Further Mechanics Active Recall Answers
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Further Mechanics Active Recall QUESTIONS:1. What quality does velocity and Vector quantities
acceleration have in common?
2. An object in uniform circular Constant speed, changing velocity
motion has what speed and
what velocity?
3. If the object is constantly Accelerating
changing its velocity, what can
be said for the object?
4. What is acceleration defined Change in velocity over time
as?
5. What is the acceleration called Centripetal acceleration, it acts
for an object moving in perpendicular to the direction of linear
circular motion? What is its speed
relationship to linear speed?
6. What does centripetal mean? Acts towards the centre of a circular path
7. What is the centripetal F=ma, the centripetal acceleration is
acceleration cause by? Which caused by a centripetal force of constant
of newtons laws applies here? magnitude that acts perpendicular to the
Explain. direction of motion, therefore towards the
centre of the circle.
8. What direction does the Towards the centre of the circle, they act
centripetal acceleration act in? in the same direction.
What direction does the
centripetal force act in? Same
or different?
9. What is the angular The change in angle of a body as it
displacement? rotates in a circle
10.How is angular displacement In radians
measured?
11.What can you do to calculate The distance travelled round the
the angular displacement circle/the radius of the circle
ratio?
12.What is the angular speed The rate of change of angular
defined as? displacement with time
13.Is angular speed a vector or Scalar quantity
scalar quantity?
14.How angular speed is Change in angular displacement/change
calculated using the change in in time
angular displacement/ angle?
15.What are the equations for ⍵=2π/T=v/r
angular speed?
16.The greater the rotation angle, The greater the rotation angle, the
the greater or smaller the greater the angular velocity.
angular velocity?
17.If an object rotates further With a larger radius, it will move with a
from the centre of the circle, smaller angular velocity.
will it have a faster or smaller
angular velocity?
18.What is centripetal The acceleration of an object towards the
acceleration defined as? centre of a circle when an object is in
motion around a circle, rotating at a
constant speed.
, 19.How is centripetal acceleration A=v2/r
calculated?
20.What is centripetal force The resultant force acting towards the
defined as? centre of the circle required to keep a
body in uniform circular motion, always
directed towards the centre of the body’s
rotation.
21.How can the centripetal force Mv2/r=mr⍵2=mv⍵
be calculated? 3 equations
22.Is the centripetal its own No
force?
23.Give three examples of Tension in string when a ball is being
centripetal forces in real life spun. Friction between car tyres and the
applications? road when a car goes round a
roundabout, gravitational force when the
earth orbits the sun.
24.What two things are needed Acceleration proportional to the
for an oscillation to be classed displacement, acceleration opposite
as simple harmonic motion? direction to the displacement
25.Name some oscillators that Pendulum on a clock, mass on a spring,
undergo simple harmonic guitar strings, electrons in alternating
motion? current flowing through a wire.
26.What is the relationship Proportional to each other a ∝ −x
between acceleration and
displacement in simple
harmonic motion?
27.What is a restoring force? A force to return an object to its
What part does it play in equilibrium position, it is directly
simple harmonic motion? proportional, but in the opposite direction
to the displacement of the object from
the equilibrium position.
28.How is the acceleration a = −⍵2x
calculated for an object in
simple harmonic motion?
29.When is the acceleration at a Acceleration is at a maximum when the
maximum using the displacement is greatest
acceleration equation for
simple harmonic motion?
30.What does the negative sign When an object is displaced to the right,
in the acceleration equation the direction of acceleration is to the left
for simple harmonic motion? and vice versa. The acceleration and the
travel of displacement are always in
opposite directions to each other.
31.What does the acceleration Negative line through the origin. The
against displacement graph gradient is the a/x=−⍵2
look like for simple harmonic
motion? What is the gradient?
32.What is the displacement X=Acos(⍵t), when the object starts from
equation for simple harmonic the maximum displacement position.
motion?
33.When are the two different X=Acos(⍵t) (x=A, t=0)
displacement equations used X=Asin(⍵t) (x=0, t=0)
for simple harmonic motion?
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