Prep 3 - Science - Prepared By Mr. ASHRAF MOSA MOHAMED

It is the regular speed by which the object moves to cover the same distance at the same period of time.

• Motion

• Average speed

• Acceleration

• Physical quantity

It is the physical quantity that has magnitude only and has no direction

• Motion

• Average speed

• Acceleration

• Scalar Physical quantity

It is the speed of a moving object relative to a constant or a moving observer

• Motion

• Average speed

• Relative speed

• Scalar Physical quantity

It is the rate of change of speed.

• Acceleration

• Average speed

• Relative speed

• Scalar Physical quantity

Physicists use other mathematical relations like graphs and tables in order to :

• Predict the relation between certain physical quantities .

• Understand practical results.

• Describe the physical phenomena in an easier way.

• All the previous

It is the speed by which the object moves when it covers equal distances at equal periods of time

• Irregular (non-uniform)

• Positive uniform acceleration

• Regular (uniform) speed

• Motion

It is an acceleration by which an object moves in a straight line when its speed decreases by equal values through equal periods of tim

• Irregular (non-uniform)

• Positive uniform acceleration

• Regular (uniform) speed

• Negative uniform acceleration

An object started its movement from rest and its speed changed to 36 km/h. in 10 seconds, calculate the body acceleration and state its type

• 1 m/sec , it's type accelerating motion

• 1 m/sec , it's type decelerating motion

• 1 k.m/h , it's type accelerating motion

• 1 m/sec² , it's type accelerating motion

Acceleration is

• vector quantity whose unit is m/s

• scalar quantity whose unit is m/s

• scalar quantity whose unit is m/s²

• vector quantity whose unit is m/s²

The shortest length covered by the object in a fixed direction is called

• distance

• displacement

• acceleration

• speed