Science Grade 6 Science Cup

Complete the following statements:

1. The crowbar is considered a................................class lever

• tweezers

• first

but the.............................. is a third class lever.

• tweezers

• first

Give reasons for :

Levers are very important in our daily life.

• It is a rigid bar that rotates around a fixed point, and is affected by an effort force and resistance force.

• It is the lever that has the effort force between the fulcrum and the resistance force.

Seesaw is considered as a first class lever.

• It is the lever that has the effort force between the fulcrum and the resistance force.

• It is a rigid bar that rotates around a fixed point, and is affected by

Correct the underlined words:

Second class levers are the most popular type of levers in our daily life.

• First

• third

The law of levers states that.............

• force x its arm = resistance x its arm.

• force/ its arm = resistance /its arm.

• force + its arm = resistance + its arm.

• force x its arm = resistance + its arm.

The values of effort and resistance in the lever depend on.........................

• the arm of force.

• the arm of resistance.

• the position of fulcrum.

• (a) and (b).

Tags

NGSS.MS-ETS1-1

Choose the correct answer:

............................. are from the artificial sources that are used before inventing the electric lamps.

• Candles

• Oil lamps

• Fluorescent lamps

• (a) and (b)

The electric lamps represent a constant source of light that is...............................

• clear.

• bright.

• free from smoke and odor.

• (a), (b) and (c).

Tags

NGSS.MS-PS4-2

The electric lamp converts the electric energy into..........................................energy.

• kinetic

• light

• sound

• magnetic