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Class 9 Physics Turning Effect of Forces


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4.10Ablockofmass10 kgissuspendedatadistanceof20 cmfromthecentreofauniformbar1 mlong.Whatforceisrequiredtobalanceitatitscentreofgravitybyapplyingtheforceattheotherendofthebar?(40 N)4.10 A block of mass 10 \mathrm{~kg} is suspended at a distance of 20 \mathrm{~cm} from the centre of a uniform bar 1 \mathrm{~m} long. What force is required to balance it at its centre of gravity by applying the force at the other end of the bar? (40 \mathrm{~N})
4.12 Why a body cannot be in equilibrium due to single force acting on it?
4.12 Why a body cannot be in equilibrium due to single force acting on it?

4.12Whyabodycannotbeinequilibriumduetosingleforceactingonit?4.12 Why a body cannot be in equilibrium due to single force acting on it?

4.6 The steering of a car has a radius 16 \mathrm{~cm} . Find the torque produced by a couple of 50 \mathrm{~N} . (16 \mathrm{Nm})
4.6 The steering of a car has a radius 16 \mathrm{~cm} . Find the torque produced by a couple of 50 \mathrm{~N} . (16 \mathrm{Nm})

4.6Thesteeringofacarhasaradius16 cm.Findthetorqueproducedbyacoupleof50 N.(16Nm)4.6 The steering of a car has a radius 16 \mathrm{~cm} . Find the torque produced by a couple of 50 \mathrm{~N} . (16 \mathrm{Nm})

EXAMPLE 4.6 A uniform rod of length 1.5 \mathrm{~m} is placed over a wedge at 0.5 \mathrm{~m} from its one end. A force of 100 \mathrm{~N} is applied at one of its ends near the wedge to keep it horizontal. Find the weight of the rod and the reaction of the wedge.
EXAMPLE 4.6 A uniform rod of length 1.5 \mathrm{~m} is placed over a wedge at 0.5 \mathrm{~m} from its one end. A force of 100 \mathrm{~N} is applied at one of its ends near the wedge to keep it horizontal. Find the weight of the rod and the reaction of the wedge.

EXAMPLE4.6Auniformrodoflength1.5 misplacedoverawedgeat0.5 mfromitsoneend.Aforceof100 Nisappliedatoneofitsendsnearthewedgetokeepithorizontal.Findtheweightoftherodandthereactionofthewedge.EXAMPLE 4.6 A uniform rod of length 1.5 \mathrm{~m} is placed over a wedge at 0.5 \mathrm{~m} from its one end. A force of 100 \mathrm{~N} is applied at one of its ends near the wedge to keep it horizontal. Find the weight of the rod and the reaction of the wedge.

4.3 Differentiate the following:(ii) torque and couple
4.3 Differentiate the following:(ii) torque and couple

4.3Differentiatethefollowing:(ii)torqueandcouple 4.3 Differentiate the following:(ii) torque and couple

EXAMPLE 4.1Find the resultant of three forces 12 \mathrm{~N} along x-axis 8 \mathrm{~N} making an angle of 45^{\circ} with x-axis and 8 \mathrm{~N} along y -axis.
EXAMPLE 4.1Find the resultant of three forces 12 \mathrm{~N} along x-axis 8 \mathrm{~N} making an angle of 45^{\circ} with x-axis and 8 \mathrm{~N} along y -axis.

EXAMPLE4.1Findtheresultantofthreeforces12 Nalongx−axis8 Nmakinganangleof45∘withx−axisand8 Nalongy−axis.EXAMPLE 4.1Find the resultant of three forces 12 \mathrm{~N} along x-axis 8 \mathrm{~N} making an angle of 45^{\circ} with x-axis and 8 \mathrm{~N} along y -axis.

4.8 Two blocks of masses 5 \mathrm{~kg} and 3 kg are suspended by the two strings as shown. Find the tension in each
4.8 Two blocks of masses 5 \mathrm{~kg} and 3 kg are suspended by the two strings as shown. Find the tension in each

4.8Twoblocksofmasses5 kgand3kgaresuspendedbythetwostringsasshown.Findthetensionineach 4.8 Two blocks of masses 5 \mathrm{~kg} and 3 kg are suspended by the two strings as shown. Find the tension in each

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