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ICSE physics

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Question
ICSEENIPH10005741
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A boy weighs 360 N on Earth.

i) What would be his approximate weight on the moon?

ii) What is the reason for your answer?

Solution

i) Weight of the body on the moon is one-sixth of the weight of the body on the earth.

Weight of the body = 1/6 x Weight of moon = 1/6 x 360 = 60 N

ii) W = mg
And, acceleration due to gravity on moon as one-sixth that on the earth. Therefore, weight on the moon is also one-sixth of the earth. 

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Question
ICSEENIPH10005742
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A body is acted upon by a force. State two conditions under which the work done could be zero. 

Solution

The two conditions are:

i) Displacement is zero.

ii) Angle between force and displacement is 90o.

Question
ICSEENIPH10005743
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A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the figure:



When the trolley is released, it if found to move at a speed of 2 m/s. What potential energy did the spring possess when compressed?     

Solution

Error converting from MathML to accessible text. 

Question
ICSEENIPH10005744
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i) Define the term momentum.

ii) How is force related to the momentum of a body?

iii) State the condition when the change in momentum of a body depends only on the change in its velocity. 

Solution

i) Momentum is defined as the product of mass and velocity of a body.

ii) Force  = Rate of change in momentum

straight F space equals space increment straight P divided by increment straight t space
iii) When velocity of the body is much smaller than the velocity of light, then the mass is constant. 

Question
ICSEENIPH10005745
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A body of mass 50 kg has a momentum 3000 kg m/s. Calculate:

i) the kinetic energy of the body.

ii) the velocity of the body. 

Solution

Given,

Mass, m = 50 kg

Momentum, p = 3000 kg m/s 
                  P = m × v
Error converting from MathML to accessible text.

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