Turning Effects of Forces

A uniform beam is pivoted at its centre.

Two masses are suspended at equal distances from the pivot.

Which statement is correct?

• If X has a mass of more than 2 kg, it will fall.

• If X has a mass of more than 2 kg, it will rise.

• If X has a mass of exactly 2 kg, it will rise.

• If X has a mass of less than 2 kg, it will fall.

A uniform bar is pivoted at its centre.

What force F is needed to balance the bar?

• 3 N

• 4 N

• 6 N

• 8 N

A door requires a minimum moment of 32.5 Nm in order to open it.

The door is to be pulled open with a force of 50 N at the handle.

What is the minimum distance of the handle from the hinges?

• 0.33 m

• 0.65 m

• 0.77 m

• 1.54 m

The diagram shows a beam. Without any weights, the beam balances at its centre.

Three weights are hung as shown.

At which point does a load of 2 N balance the beam?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-4

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