Grade 8 Physics lower secondary checkpoint

What is meant by balanced forces?

• equal forces in opposite direction

• equal forces in the same direction

• unequal forces in opposite direction

• unequal forces in the same direction

If a moving car is affected by balanced forces, it'll move by ..................

• increasing speed

• decreasing speed

• constant speed

What is the name of the force that pushes the object upwards in the air or water?

• friction

• gravity

• upthrust

• magnetism

If a stationary object is affected by force 50 N in the right side and two forces 25 N and 50 N in the left side, it'll ..............

• not move

• move towards right side

• move towards left side

• move upwards

Which statement is NOT correct about friction?

• friction opposes the motion

• smooth surfaces increase friction

• rough surfaces increase friction

• friction decreases the speed of moving object

Camel has flat feet not to sink in the sand, this is because flat feet provide large surface area so the pressure will be .........

• more

• the same

• less

What is the measuring unit of density

• g/cm³

• cm³/g

• g/cm

• N/m²

Calculate the pressure caused by a block of iron its weight is 500 N and the area of its side is 25 cm².

• 1250 Ncm²

• 2 N/cm²

• 20 N/cm²

• 200 N/cm²

What is the mathematical formula used to calculate the moment?

• force / area

• force x area

• force x distance to the pivot

• force / distance to the pivot

For any system to be balanced, ...............................

• anticlockwise moment and clockwise moment should be equal

• anticlockwise moment should be bigger than clockwise moment

• clockwise moment should be bigger than anticlockwise moment

• None of above is correct