Turning Effect Of Forces

A force of 8.0 N is applied to a spanner at a perpendicular distance of 25 cm from the centre of a nut. What is the moment of the force about the centre of the nut?

Which statement correctly defines the moment of a force?

A uniform beam is balanced on a pivot at its centre. A 15 N weight hangs 0.40 m to the left of the pivot. What weight must hang 0.60 m to the right of the pivot to maintain equilibrium?

A student states: “An object is in equilibrium when no forces act on it.” Which correction should be made to this statement?

Explain why a mechanic uses a long-handled wrench rather than a short-handled wrench to loosen a tight bolt. Which reasoning is correct?

A beam is balanced on a pivot. A 4.0 N weight is placed 0.50 m to the left of the pivot, producing an anticlockwise moment. A weight W is placed 0.25 m to the right. What is the value of W for equilibrium?

Which pair of conditions must both be satisfied for an object to be in equilibrium?

A child of weight 400 N sits 2.0 m from the pivot of a seesaw. A second child sits on the opposite side at 1.6 m from the pivot. The seesaw is in equilibrium. What is the moment produced by the first child about the pivot?

A gate is pushed with a force of 30 N applied at right angles to the gate, at a distance of 1.2 m from the hinge. The moment about the hinge is 36 N m. If the same force is now applied at 0.4 m from the hinge, what is the new moment?

In the moment balance experiment, a student finds that the metre rule does not balance at the 50.0 cm mark when unloaded. What is the most appropriate action?

A force of 50 N produces a moment of 15 N m about a pivot. Calculate the perpendicular distance from the pivot to the line of action of the force.

A crane arm is horizontal and has a heavy load hanging from its end. The load tends to rotate the arm clockwise about the base pivot. A steel cable attached to the arm above the pivot pulls upward at an angle. The arm remains stationary. Which statement explains why the arm is in equilibrium?

A beam is balanced on a pivot. On the left side, a 6.0 N weight hangs at 0.30 m from the pivot and a 2.0 N weight hangs at 0.60 m from the pivot. On the right side, a single weight W hangs at 0.40 m from the pivot. Calculate W.

A beam is balanced on a pivot. On the left, a 4.0 N weight hangs at 0.50 m and a 1.0 N weight hangs at 0.20 m from the pivot. On the right, a 3.0 N weight hangs at 0.40 m and an unknown weight W hangs at 0.50 m from the pivot. Calculate W.

The SI unit of the moment of a force is the newton-metre (N m). A student writes that the moment of a force is measured in joules (J) because 1 J = 1 N × 1 m. Which statement correctly explains why this is wrong?

In the moment balance experiment, a student places three weights on a metre rule balanced at its centre: 2.0 N at the 20.0 cm mark, 3.0 N at the 35.0 cm mark, and 4.0 N at the 70.0 cm mark. The pivot is at the 50.0 cm mark. Determine whether the beam is in equilibrium.

A student doubles both the force applied to a lever and the perpendicular distance from the pivot. By what factor does the moment change?

In the moment balance experiment, a student measures the following for a balanced beam: left side has a 5.0 N weight at 0.20 m from the pivot; right side has a weight at 0.25 m from the pivot. The student calculates the right-side weight as 4.0 N. The accepted value is 4.0 N. The student then adds a 2.0 N weight at 0.10 m to the left of the pivot. At what distance from the pivot should a 1.0 N weight be added to the right side to restore equilibrium?