A 3 kg object is moving in a circular path of radius 2 m with a speed of 4 m/s.

Practice Questions

Q1
A 3 kg object is moving in a circular path of radius 2 m with a speed of 4 m/s. What is the centripetal force acting on it?
  1. 6 N
  2. 12 N
  3. 24 N
  4. 36 N

Questions & Step-by-Step Solutions

A 3 kg object is moving in a circular path of radius 2 m with a speed of 4 m/s. What is the centripetal force acting on it?
  • Step 1: Identify the mass of the object. In this case, the mass (m) is 3 kg.
  • Step 2: Identify the speed of the object. The speed (v) is 4 m/s.
  • Step 3: Identify the radius of the circular path. The radius (r) is 2 m.
  • Step 4: Use the formula for centripetal force, which is F = mv²/r.
  • Step 5: Substitute the values into the formula: F = 3 kg * (4 m/s)² / 2 m.
  • Step 6: Calculate (4 m/s)², which is 16 m²/s².
  • Step 7: Multiply 3 kg by 16 m²/s² to get 48 kg*m²/s².
  • Step 8: Divide 48 kg*m²/s² by 2 m to find the centripetal force.
  • Step 9: The result is 24 N, which is the centripetal force acting on the object.
  • Centripetal Force – The force required to keep an object moving in a circular path, directed towards the center of the circle.
  • Newton's Second Law – The relationship between force, mass, and acceleration, which is fundamental in calculating forces acting on objects.
  • Kinematics – The study of motion, which includes understanding speed, velocity, and the effects of forces on moving objects.
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