# 9th Class Physics Chapter 4 Numerical Problems 2024

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## 9th Class Physics Chapter 4 Numerical Problems Notes

• Find the resultant of the following forces:
• (i) 10 N along x-axis
• (ii) 6 N along the y-axis and
• (iii) 4 N along negative x-axis.
• Find the perpendicular components of a force of 50 N making an angle of 30° with x axis.
• Find the magnitude and direction of a force, if its x-component is 12 N and y- y-component is 5 N.
• A force of 100 N is applied perpendicularly on a spanner at a distance of 10 cm from a nut. Find the torque produced by the force.
• A force is acting on a body making an angle of 30° with the horizontal. The horizontal component of the force is 20 N. Find the force.
• The steering of a car has a radius of 16 cm. Find the torque produced by a couple of 50 N.
• A block of mass 10 kg is suspended at a distance of 20 cm from the center of a uniform bar 1 m long. What force is required to balance it at its center of gravity by applying the force at the other end of the bar?
• A nut has been tightened by a force of 200 N using a 10 cm long spanner. What length of a spanner is required to loosen the same nut with 150 N force?
• Two blocks of masses 5 kg and 3kg are suspended by the two strings as shown. Find the tension in each string.
• A picture frame is hanging by two vertical strings. The tensions in the strings are 3.8 N and 4.4 N. Find the weight of the picture frame.