prep 3 , lesson 1

The concept of the body movement means........

• constancy of its position with the change in time.

• the change in its position with the time.

• its speed.

• its acceleration.

The two factors which can be used to describe the motion of a body are the

• speed and time.

• distance and time.

• area and time.

• displacement and speed.

The distance covered by a moving body through a unit time is called the ....... of the body.

• weight

• density

• speed

• Motion

Speed equals

• distance÷ time.

• distance x time.

• distance + time.

• time ÷ distance.

Speed measurement unit is............

• metre.second.

• metre/second.

• metre/second2

• kg.

If a car and a bike moving from the same position and in the same direction, the speed of the car is 50 m/sec. and the speed of the bike is 10 m/sec., after 4 seconds. The distance between them becomes........meter.

• 100

• 160

• 200

• 240

When a moving object covers equal distances in equal periods of time, this means that the object moves at

• uniform speed.

• uniform acceleration.

• average speed.

• relative speed.

A car covers 180 metres in two seconds, so its speed equals

• 90 m/sec.

• 180 km/h.

• 25 km/h.

• 45 m/sec

In case of motion that is described as movement at an irregular speed, in this case, it is useful to refer to another term which is the ............ speed.

• uniform

• scalar

• vector

• average

The result of multiplying the speed of a body by the time.

• Speed

• Time

• AAverage speed

• DDistance