Pivot Point

A cat weighing 50 N is 1 m from the pivot. How far away does a mouse weighing 0.5 N have to be to balance the beam?

• 1 m

• 10 m

• 100 m

• 1000 m

A force exerts a moment of 2 Nm. What is the distance of the force from the pivot?

• 2 m

• 4 m

• 1 m

• 0.5 m

A force exerts a moment of 2 Nm. What is the distance of the force from the pivot?

• 1 m

• 0.5 m

• 0.2 m

• 0.25 m

Two masses of mass 10.0 and 6.0 kg are hung from massless strings at the end of a light rod. The rod is virtually weightless. A pivot (fulcrum) is placed off center and the system is free to rotate. If the 6.0 kg mass is 4.0 m away from the pivot, how far away is the 10.0 kg mass if the system is not rotating?

• 0.42 m

• 2.4 m

• 4.8 m

• 4.2 m

Tags

NGSS.MS-PS2-2

The figure below shows a man lifting a heavy rock using a steel bar. He pushes downwards on the end of the bar with a force F.

Which pivot positions allows the force F to be as small as possible?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-2

Assuming the system is in equilibrium, calculate the missing distance d

• 3.4 m

• 2.8 m

• 4.4 m

• 1.6 m

Tags

NGSS.MS-PS2-2

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-PS2-1

NGSS.MS-PS2-2

What to we call forces applied to anything that turns?

• Minute

• Moment

• Minimum

• Monument

Tags

NGSS.MS-PS2-1

State the principle of moments.

• When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the same pivot.

• When a system is in equilibrium, the sum of the total clockwise moment is greater the sum of the total anti-clockwise moment about the same pivot.

• When a system is in equilibrium, the sum of the total clockwise moment is less than the sum of the total anti-clockwise moment about the same pivot.

• When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the different pivot.

What is the pivot point in a lever system?

• The point where the lever is supported and rotates

• The point where the force is applied

• The point where the load is placed

• The point where the lever is balanced