Turning Moment of Force

A pivoted window, weighing 100 N, is opened with a force of 30 N. What is the magnitude of the resultant moment about the pivot?

• 1.0 N m

• 5.0 N m

• 35 N m

• 41 N m

An object is designed to topple over easily when hit. What should the object have so that it can topple over easily?

• A

• B

• C

• D

A uniform plank is pivoted at its mid-point and a weight is added on either side in the positions shown. The plank is balanced by the upward 2 N force. What is weight X?

• 4.0 N

• 6.0 N

• 10 N

• 12 N

A child has a set of wooden 3-dimensional capital letters. Which letter, H, I, R or Y, is the most stable when standing upright on a table?

• A

• B

• C

• D

The diagram shows a plank supported by a pivot. A block P is placed on one end of the plank and a block Q of weight 400 N is placed on the other end. The weight of the plank can be ignored. What is the weight of block P in order to keep the plank horizontal?

• 150 N

• 240 N

• 360 N

• 667 N

Below is a lamina of uniform thickness. Where is its centre of gravity most likely to be?

• A

• B

• C

• D

The diagram shows a ball of radius 20 cm placed against a step. If the ball weighs 40N, what is the minimum force F that can be applied to move the ball up the step?

• 20 N

• 40 N

• 800 N

• 1600 N

Which container below is the most stable?

• A

• B

• C

• D

Which arrangement of books on a shelf is the most stable? (The shaded boxes on the shelf contain the books.)

• A

• B

• C

• D

The figure shows a metre rule hanging from the ceiling using two ropes. Two weights, 12 N and 20 N, are attached to the metre rule. What is the tension T2?

• 11 N

• 12 N

• 16 N

• 32 N