NUMERICAL UNIT 4 TURNING EFFECTS OF FORCE PHYSICS CLASS 9 KPK BOARDS.

Ehtisham Tariq lecturer in Warsak Model School and College Peshawar.
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NUMERICAL UNIT 4 TURNING EFFECTS OF FORCE PHYSICS CLASS 9 KPK BOARDS
numerical questions chapter 4:
1) to open a door force of 15 newton is applied at 30 degree to the horizontal find the horizontal and vertical components of a force
2) A bolt on a car engine needs to be tightened with the torque of 40 Newton metre .you use a 25 cm long wrench and pull on the end of the wrench perpendicularly how much force do you have to exerts.
3) Sana whose mass is 43 kg sits 1.8 m from the centre of the seesaw Faiz whose mass is 52 kg wants to balance Sana how far from the centre of the seesaw should a sit?
4) two kids of weighing 300 Newton and 350 Newton are sitting at the ends of 6 m long see-saw the seesaw is pivoted at its centre where would third kids sit so that the seesaw is in equilibrium in the horizontal position. the weight of the third kid is 250 Newton.
5) two children push on opposite sides of a door during play. both push horizontally and perpendicular to the door one child pushes with the force of 20 Newton at a distance of 0.60 m from the hedges and the second child pushes at a distance of 0.50. what force must the second child exit to keep the door from moving. assume friction is negligible
6) A construction crane lifts building material of mass 1500 kg by moving its crane arm, calculate moment of force when moment arm is 20m .after lifting the crane arm which reduces moment arm to 12 m calculate moment.
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