Summary Edexcel A Level Physics Student Book 2 - Unit 7 - Electric Magnetic Fields
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PHYSICS
EDEXCEL IAL
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UNIT 4 : MOMENTUM
Q1
A DVD is rotating at 570 rotations per minute.
What is its angular velocity in radians per second?
(1)
A 1.5
B 10
C 60
D 3600
(Total for question = 1 mark)
Q2.
A student read the following extract from a textbook.
'In an elastic collision between objects of equal mass, where one is initially stationary, the objects move off at 90° to each
other after the collision.'
The student investigated this using a collision between two identical steel balls, each of mass 66 g.
(a) The diagrams illustrate the collision between the balls.
1
, In one experiment u1 was 0.72 m s−1 and θ was 29°. For such a collision it can be shown that, if the balls are to
separate at 90°, then
v1=0.63ms−1
φ= 61°
v2=0.35ms−1
(i) Show that these values satisfy the conditions for conservation of momentum in the initial direction of ball 1.
(b) The photograph shows the student's actual results for this experiment. The positions of the colliding balls at successive
time intervals have been overlaid on a single image.
(i) State the additional information that the student needs in order to determine the speeds of the balls.
(ii) The student looked at the photograph and noticed that the angle between the paths of the two balls after
thecollision was not 90°. He modelled the collision on a computer.
He used the same initial conditions for ball 1 and the same value of θ. The computer calculated the total kinetic energy
after the collision for a range of angles φ. The following graph was produced.
3
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