levers& law of levers & electric lamps

In the lever, the fixed point (fulcrum) is symbolized by...............

• F

• o

• R

• E

...............is example of levers that used to increase force

• tweezers

• manual broom

• crowbar

..............is a very accurate lever.

• tweezers

• manual broom

• crowbar

write scientific term :

A rigid bar that rotate around a fixed point and affected by an effort force and resistance. (-------------------------)

Give reasons:

Crow bar is considered an increasing force lever.

Classify the following lever

pincer

Lever affected by 500 Newton force and arm length is 20 meter and

also affected by 1000 Newton resistance, and its arm length is 5 m , is

the lever at equilibrium?

• yes

• no

The length of the force arm of a first class lever is 5 cm. and the

length of resistance arm is 15 cm. if the resistance has a value of 300

Newton, calculate the value of effort force.

• 100 N

• 300 Cm

• 600 cm

• 900 N

The force and resistance are equal in levers if ............................

• resistance arm > force arm

• resistance arm < force arm

• resistance arm = force arm

Second class lever, force = 200 Newton. Force arm = 5 cm,

calculate the resistance arm, When the resistance = 100 N.

• 10 cm

• 10 N

• 4000 cm

• 400 N