Worksheetslevers& law of levers & electric lamps
Total questions: 15
Worksheet time: 17mins
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. (-------------------------)
(a)
Give reasons:
Crow bar is considered an increasing force lever.
(a)
Classify the following lever
pincer
(a)
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
The only type of levers, where the arm of force and the arm of resistance are
equal is the.....................
1st class levers
2nd class levers
3rd class levers
The type of levers which always saves effort
1st class levers
2nd class levers
3rd class levers
The type of levers which always doesn't conserve effort
1st class levers
2nd class levers
3rd class levers
Some types of electric lamps are.............and.................
electric bulb
Fluorescent lamps.
electric saver lamp
The .................is the main source of light on the earth.
sun
stars
moon
