تمارين أونلاين ///Science Revision on Unit 1 Part 2

……….is a physical quantity which is used to describe the motion of the object.

If the uniform speed of a car is 72 km/h so its speed=…………m/s.

The relative speed of a moving object relative to an observer moves at the same speed in the opposite direction is…………..the actual speed.

When the object moves in a direct straight line in on direction therefore……………

The object moves at constant uniform speed when…………..

When car (A) covers smaller distance than car(B) at the same time, therefore…………..

When an object moves in a straight line in one direction . the ratio between the distance and displacement is……………….

If the relative speed of a car is 60 km/h relative to an observer in the same direction at 40km/h , therefore the actual speed of this car is…………….

problems

• If the relative speed of the steamship is 550 km/h as it monitored by aircraft moving in the opposite direction at speed of 425 km/h

what is the time taken by the steamship from the moment of monitoring until it arrives at distance of 60 km?

problems

The opposite graph the movement of two objects(X) and (Y).

a- which of them start its motion from rest.

b- which of them moves with greater acceleration.

c- when do the two objects start moving at regular speed ?and what is its value.

problems

If a bicycle moved 1500 m eastward then 1700 m westward , so the difference between the distance and displacement is………..meter

When are the scalars physical quantities added and subtracted?

When the relative speed equal its speed?

When the displacement of an object equal zero?