science grade 6

all the following is from the importance of levers except....?

• avoid safety

• accuracy in performance

• increasing speed

• increasing distance

G.R the crowbar is considered as an increasing force lever

• Because it is used to pick up very small objects

• Because it is used to help in avoiding danger

• Because it is used to move heavy loads by using a small effort force.

• none of them are correct!

The ...... exerted by a person to equilibrate the resistance.

• fulcrum force

• effort force

• resistance force

• air force

from the second class lever..

• water pump

• mercury vapour

• paddle

• stapler

the mid point of the 3rd class lever is fulcrum.

• true

• false

Increases the speed of objects that we affect them.

• Scissors

• Manual broom

• a rigid bar

• Hockey bat

The third class levers are the most popular type of levers.

• false

• true

when the force arm and the resistance arm are equal..

• convert effort

• doesn't convert effort

• doesn't change

• it gets heavier

Electric lamp converts kinetic energy into light energy

• false

• true

In second class levers , the effort arm is always longer than the resistance arm.

• true

• false