Levers law Revision

If the arm of force is shorter than the arm of resistance, then the effort force is

.............................................. than the resistance force.

• equal

• smaller

• larger

There is a conservation of effort force in the first-class levers, if the ...............................

is longer than the ............................................

.

• resistance arm

  force arm

• force arm

  resistance arm

Which of the following lever(s) save(s) conserve(s) effort?

• Scissors

• Nutcracker

• Fishing rod

• Sweet holder

They are simple machines that always save effort.

• Lever

• Lemon squeezer

• first class levers

• Second class levers

The distance between the effort force and the fulcrum.........................................

Determine which of the following levers conserves the effort.

Give a reason for your answer.

• (b), because the arm of force is shorter than the arm of resistance.

• (b), because the arm of force is longer than the arm of resistance.

• (a), because the arm of force is longer than the arm of resistance.

• (a), because the arm of force is shorter than the arm of resistance.

The arm of force is longer than the arm of resistance.

• the resistance will be bigger than the force, so the force will be saved.”The resistance

• force will be less than the resistance force, so the effort will be saved.

• force= resistance

The effort force may be equal to the resistance force in the first-class levers.

• when the resistance is the midpoint

• when the fulcrum is the midpoint

• when the forceis the midpoint

• when force arm = resistance arm

The crowbar conserves effort.

• force is smaller

  than resistance

• fulcrum is the midpoint

• force arm is longer than resistance arm

• resistance is the midpoint

Calculate the length of the arm of force in a lever whose force value equals 400 N and its resistance value is 200 N.,the resistance arm 10 cm

• 20N

• 10 cm

• 15 cm

• 20 cm