10 Questions MCQ Test Science Class 9 - Test: Force
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A stone of 1 kg is thrown with a velocity of 20 m s–1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?
Detailed Solution for Test: Force - Question 6
Here, m = 1kg, u = 20 ms-1, v = 0, s = 50m, F = ?
From v2 - u2 = 2as
0 - (20)2 = 2a x 50 = 100a
a = -400/100
a = -4 ms-2
∴ F = ma
F = 1 (-4)
F = -4 N
Negative sign indicates that force of friction is opposing the motion of the ball.
__________ is a force, which always opposes the motion of one body over the other body in contact with it
Detailed Solution for Test: Force - Question 7
Friction is a a force that comes into play when two surfaces come in contact with each other. The frictional force acts in the opposite direction of the motion of the object. The force of friction opposes the relative motion between the surfaces of two moving objects.
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