Higher Physics
Our Dynamic Universe
Check Test 3: Solutions
1. D
2. B
3. C
4. A
5. C
6. D
7. C
8. C
9. A
10. D
11 (a). (i).
(1)
(1)
(1)
(ii).
A collision in which total momentum is conserved but kinetic energy is lost.
(1)
(1)
(b). (i).
(1)
(1)
(ii).
Find largest % uncertainty:
(1)
(1)
12 (a).
The total momentum before a collision is equal to the total momentum after a collision,
provided that no external forces are acting.
(1)
(1)
(b).
(1)
(1)
H Physics: ODU—CT 3
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L. Mitchell
(c).
(1)
(1)
(1)
(1)
OR
(1)
(d).
by conservation of energy
It increases the time over which the force acts, (1)
therefore reducing the overall average force exerted on the person (since change in
momentum stays the same).
(1)
(A smaller average force decreases the risk of injury.)
H Physics: ODU—CT 3
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L. Mitchell