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Laws of Motion Test - 37
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Laws of Motion Test - 37

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  • Question 1/10
    4 / -1
    According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
    A cricket ball of mass 150 g. is moving with a velocity of 12 m/s and is hit by a bat so that the ball is turned back with a velocity of 20 m/s. If duration of contact between the ball and the bat is 0.01 sec. The impulse of the force is
  • Question 2/10
    4 / -1
    According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
    Average force exerted by the bat is
  • Question 3/10
    4 / -1
    According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
    The force acting on a body whose linear momentum changes by 20 kgms–1 in 10 sec is
  • Question 4/10
    4 / -1
    According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
    An impulsive force of 100 N acts on a body for 1 sec What is the change in its linear momentum ?
  • Question 5/10
    4 / -1

  • Question 6/10
    4 / -1
    A block B, placed on a horizontal surface is pulled with initial velocity V. If the coefficient of kinetic friction between surface and block is μ, than after how much time, block will come to rest ?
    Solutions

  • Question 7/10
    4 / -1
    As shown in figure a block of mass m is attached with a cart. If the coefficient of static friction between the surface of cart and block is μ than what would be acceleration α of cart to prevent the falling of block ?

    Solutions

  • Question 8/10
    4 / -1

    Solutions

  • Question 9/10
    4 / -1
    A force of 98 N is required to just start moving a body of mass 100 kg over ice. The coefficient of static friction is
    Solutions

  • Question 10/10
    4 / -1
    Two balls of masses m1 and m2 are separated from each other by a powder charge placed between them. The whole system is at rest on the ground. Suddenly the powder charge explodes and masses are pushed apart. The mass m1 travels a distance s1 and stops. If the coefficients of friction between the balls and ground are same, the mass m2 stops after travelling the distance
    Solutions

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