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Quantity and motions
Scalar and Vector QuantitiesScalar and Vector Quantities
Quantity
Scalar
Vector
magnitude(number). magnitude(number) and its direction
work , energy , length, density, volume, speed , distance , and time
work , energy , length, density, volume, speed , distance , and time
A car moves due west with the velocity of 50 m/s force , Rotation moment , electric current ,displacement, acceleration, weight
A car moves due west with the velocity of 50 m/s force , Rotation moment , electric current ,displacement, acceleration, weight
Scalar Quantity Unit of Scalar Quantity
Energy J , kJ , Cal
Temperature °C
Time s , min , hr
Area cm² , m² , km²
Volume cm3 , dm3
Speed m/s ,km/hr
Scalar Quantity
exercise 1.11. A wind blows from the east at 100 miles/hour……………………………………………………………………………………
2. I add 20 grams of sugar to a recipe.…………………………………………………………………………………..
3. I buy a liter (1000ml) bottle of water.……………………………………………………………………………………
4. A plane flies south at 500 miles/hour…………………………………………………………………………………..
5. A man walks 3 miles north then turns right and walks 4 miles east.…………………………………………………………………………………
6. 20 0C of water……………………………………………………………………………………
MotionMotion
1. Linear motion : a motion occurring in a straight line. It is the most basic of all motions.
2. Projectile motion : a motion occurring when an object is thrown or projected at an angle into the air
Example arrow being shot , golf balls being hit and basketball being thrown in to the net Example arrow being shot , golf balls being hit and basketball being thrown in to the net
2.3 Circular motion : a motion occurring when object moves in a circular path. The motion has a fixed radius.
2. Displacement is a vector quantity which refers to the shortest length connection the starting point and the end point.