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Chapter 4 Force and Motion - Test 2
1.
The greatest disadvantage of friction is that we can walk on the ground
1) True
2) False
2.
Kinetic friction is usually less than static friction
1) True
2) False
3.
fs (max) remains inversely proportional to fn.
1) True
2) False
4.
The value of μk is usually less than that of μs.
1) False
2) True
5.
The friction between the two surfaces depends upon the normal force therefore the area of contact between the two surfaces affect its value.
1) True
2) False
6.
In rolling friction the surface of a body moves by sliding against the surface of another body
1) False
2) True
7.
If no external force acts the body retains its state of rest or of _______
1) Vibratory Motion
2) uniform Motion
3) Rotatory Motion
4) Translatory motion
8.
The value of gravitational acceleration 'g' does not remain ____ at all places.
1) unequal
2) modified
3) changed
4) same
9.
If a wooden black of mass 1.5 kg is pushed along a smooth surface of a table with a force of 5 6N, the acceleration of the block is _______
1) 4ms
2
2) 4ms
-2
3) -4ms
-2
4) -4s
-4
10.
The _____ of a body can be measured by a spring balance
1) weight
2) mass
3) Force
4) Tension
11.
When two bodies connected by a string move vertically then the value of acceleration a of the bodes will be ________
1) 2m
1
m
2
g/ (m
1
+m
2
)
2) m
1
g/ (m
1
+m
2
)
3) m
1
m
2
g /(m
1
+m
2
)
4) (m
1
-m
2
)g/(m
1
+m
2
)
12.
Rate of change in momentum is _______
1) V(vf-Vi)/ t
2) M(vf-Vi)/t
3) mv(e)mv t
4) Vf-Vi /t
13.
The direction of change in momentum is in the direction of the _______
1) Velocity
2) magnitude
3) Force
4) Speed
14.
According to Newton's first law of motion a car should continue its motion with _____even if its engine is turned off
1) average velocity
2) relative velocity
3) uniform velocity
4) velocity velvety
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