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When is a system in equilibrium?

A system is in equilibrium when there is no resultant force and no resultant torque (or moment). A moment is the turning effect of applying a force on a body. It is the product of the force and the perpendic...
RT
Answered by Razvan T. • Physics tutor
3945 Views

On a pirate ship, a 1.6m plank is held at one end to the ship. A 65kg pirate walks the plank with his 1.1kg parrot following 40cm behind him. What is the total clockwise moment acting on the plank when the pirate reaches the end of it?

Moment = force x distance Pirate: force = 65 x 9.81 =637.65 distance = 1.2 moment = 637.65 x 1.6 =1020.24 = 1020 Nm (3 sig fig) Parrot: force = 1.1x 9.81 = 10.791 distance = 1.6 - 0.4 = 1.2 moment = 10.791 x...
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Answered by Amy S. • Physics tutor
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Ann and Bob play on a uniform seesaw. The seesaw is 4m long and Ann and Bob weigh 600N and 800N respectively. If both Ann and Bob start at one end of the seesaw and Bob starts to walk up the seesaw at 2m/s, after how long will the seesaw turn?

(expect a diagram of a uniform seesaw with a pivot in the middle, infered from the question) For the seesaw to turn, Bob must create a greater Moment than Ann. Moment = Force * Perpedicular distance to pivot...
AS
Answered by Angus S. • Physics tutor
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Draw diagrams to represent the particles in each state: solid, liquid, and gas.

The box for the solid should be an orderly set of circles with no gap between each one. The box for the liquid represents molecules with more energy but not all bonds have been broken. Therefore the box shou...
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Answered by Alex V. • Physics tutor
6511 Views

What is the conservation of energy?

Energy comes in many forms (e.g. chemical, potential, kinetic). We say that energy is transferred when it changes from one form to another. The conservation of energy means that in a closed system the amount...
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Answered by Augustina B. • Physics tutor
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