Moments

A moment is...

• a force measured in Newtons

• a turning force measured in newton metres

• a distance measured in metres

• a time intervals measured in clicks

Moment (Nm) =

• Force (N) x distance (m)

• Angular Force (N°) x distance (m)

• Work done (J)

• Force (N) x distance (s)

The easiest way to open a heavy door  is by applying the force

• Near the hinges
• In the middle of the door
• At the edge of the door far from the hinges
• At the top of the door

Tags

NGSS.HS-PS2-1

A nut can be loosened more easily with

• a short spanner because a larger turning effect can be produced.

• a long spanner because a larger turning effect can be produced.

• a long spanner because a larger force can be produced.

• a short spanner because a larger force can be produced.

To calculate a turning effect of a spanner the force is multiplied by the length of the spanner

• always - if the length of the spanner is equal to the distance from the fulcrum to the applied force

• never - the length must be equal to the distance from the pivot to the fulcrum

• if the length of the spanner is equal to the parallel distance from the pivot to the applied force

• if the length of the spanner is equal to the perpendicular distance from the pivot to the applied force

What to we call forces applied to anything that turns?

• Minute

• Moment

• Minimum

• Monument

Tags

NGSS.HS-PS2-1

What are the units for Moment?

• N

• kgm/s

• kN

• Nm

What is the moment produced by the 15 N?

• 15 Nm (clockwise)
• 150 Nm (anti - clockwise)
• 1.5 Nm (anti - clockwise)
• 0.15 Nm (clockwise)

1. A _________is a simple machine with a fulcrum and a rigid bar.

• Pivot
• Lever
• Wedge

A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?

• 7.5 Nm
• 1.5 Nm
• 750 Nm
• 150 Nm

Tags

NGSS.HS-PS2-1