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Physics 9 Chapter 3 - Dynamics - 15
1.
What will be the formula of tension in the string for vertical motion of two bodies attached to the ends of a string that passes over the frictionless pulley?
a) T = (2m
1
m
2
) / (m
1
+ m
2
)
b) T = (m
1
m
2
)g / (m
1
+ m
2
)
c) T = (2m
1
m2)g / (m
1
+ m
2
)
d) T = (m
1
m
2
) / (m
1
+ m
2
)
2.
Two masses 5.2 kg and 4.8 kg are attached to the ends of an inextensible string which passes over a frictionless pulley. Find the acceleration in the system when both the masses are moving vertically?
a) 5.2 ms
-2
b) 50 ms
-2
c) 0.4 ms
-2
d) 4.8 ms
-2
3.
What will be the formula of acceleration for motion of two bodies attached to the ends of a string that passes over the frictionless pulley such that one body moves vertically and the other moves horizontally?
a) Formula: a = (m
2
) g / (m
1
- m
2
)
b) Formula: a = (m
2
) g / (m
1
+ m
2
)
c) Formula: a = (m
1
) g / (m
1
- m
2
)
d) Formula: a = (m
1
) g / (m
1
+ m
2
)
4.
What will be the formula of tension in the string for motion of two bodies attached to the ends of a string that passes over the frictionless pulley such that one body moves vertically and the other moves horizontally?
a) T = (2m
1
m
2
) / (m
1
+ m
2
)
b) T = (m
1
m
2
)g / (m
1
+ m
2
)
c) T = (m
1
m
2
) / (m
1
+ m
2
)
d) T = (2m
1
m
2
)g / (m
1
+ m
2
)
5.
A string is stretched by two equal and opposite forces 10 N each. How much is the tension in the string?
a) 5 N
b) Zero
c) 10 N
d) 20 N
6.
Two masses 4 kg and 6 kg are attached to the ends of an inextensible string which passes over a frictionless pulley such that mass 6 kg is moving over a frictionless horizontal surface and the mass 4 kg is moving vertically downward. Find the acceleration in the system?
a) 10 ms
-2
b) 6 ms
-2
c) 4 ms
-2
d) 24 ms
-2
7.
Two masses 4 kg and 6 kg are attached to the ends of an inextensible string which passes over a frictionless pulley such that mass 6 kg is moving over a frictionless horizontal surface and the mass 4 kg is moving vertically downward. Find the tension in the string?
a) T = 4 N
b) T = 10 N
c) T = 24 N
d) T = 20 N
8.
Which of the following is denoted by Pi?
a) Final potential
b) Initial momentum
c) Initial potential
d) Final momentum
9.
Which of the following is denoted by P
f
?
a) Final potential
b) Initial momentum
c) Initial potential
d) Final momentum
10.
Two masses 5.2 kg and 4.8 kg are attached to the ends of an inextensible string which passes over a frictionless pulley. Find the tension in the string when both the masses are moving vertically?
a) T = 40 N
b) T = 48 N
c) T = 50 N
d) T = 52 N
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