Checkpoint 1 Physics

How is this illusion working?

• the 11 dots appear but stay constantly in one place

• the 12 dots appear and move with eyes

• there are 12 dots, i can see them all

• i can see the design only

what is meant by 10^-6 m

• mm

• μm

• nm

• Mm

What is 1 g in kg?

• 0.000 001 kg

• 0.001 kg

• 1000 kg

• 0.01 kg

estimate the average time taken for a parachute to fall a distance of 3 m

• 1 s

• 5 s

• 15 s

• 20 s

Which of the following adjustments doesnt increase accuracy?

• place ruler and measure

• reset a stopwatch before repeating a timing

• make sure balance is at zero before you weigh

• keep your eye perpendicular to the reading/pointer

Hotness/coldness of a substance is

• celsius

• temperature

• bulb

• expansion

which is the type of force in pulling of strings?

• friction

• tension

• normal force

• upthrust

Which of the following is the wrong option for "what a force does"?

• change shape

• change speed & direction

• change shape

• change mass

Static friction is stronger than sliding friction. True or False?

• True

• False

What is the resultant force of the object in the picture?

• 10 N to right

• 20 N to right

• 20 N to left

• 30 N to left