Turning effect of forces

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.

Jack has a weight of 300 N and sits 2.0 m from the pivot of see-saw. Jill has a weight of 450 N and sits 1.5 m from pivot. Who will move down?

• Jack

• Jill

• Both of them

• None of them

Tags

NGSS.MS-PS2-4

What is the anticlockwise moment acting on this crane?

• 80,000Nm
• 100,000Nm
• 120,000Nm
• 140,000Nm

Tags

NGSS.HS-PS2-1

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

What is the equation for moments?

• Moment = force x perpendicular distance from pivot

• Moment = mass x velocity

• Moment = force x distance

• Moment = force x parallel distance from pivot

What is the moment acting on the seesaw?

• 1.6Nm
• 15Nm
• 16N
• 4Nm

Tags

NGSS.HS-PS2-1

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-ETS1-2

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The moment of a force causes an object to

• move forward

• move backward

• stop moving

• turn about a fixed point

The diagram shows a gauge which measures the amount of liquid in a tank. At which position should the pivot be placed so that the pointer moves the greatest distance as the tank is emptied?

• A

• B

• C

• D

Which one of the following activities does not apply the turning effect of a force?

• swinging on a swing

• sliding down a slide

• moving up and down on the see-saw

• rowing a boat