Graphic representation of moving in straight lUnit 1 - Lesson 2

Which graph represents the movement of an object at a constant speed?

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• 
• 
• 

Acceleration is the ...................

• change in distance in a unit time.

• change in speed in a unit time.

• rate of change of distance relative to the speed

• change in position relative to the observer.

Acceleration measurement unit is ...............

• meter/sec.

• meter.sec.

• meter/sec2

• meter.sec2

The object moves at a constant uniform speed, this means that ................

• it moves at zero acceleration.

• it moves at constant acceleration.

• it covers equal distances at unequal time intervals.

• it covers unequal distances at equal time intervals.

...................... are mathematical methods that physicists use to predict the relation between certain physical quantities.

• Tables only

• graphs only

• Tables and graphs

• no correct answer

........................ i s the change of the object speed by equal values (increases or decreases) through equal periods of time.

• Uniform speed

• Non-uniform acceleration

• Uniform acceleration

• Non-uniform speed

A special car can move from rest and its speed reaches 90m/sec. in 10 seconds. What is the acceleration at which the car moved?

• 9 m/sec.

• 9 m/sec2

• 1/9 m/sec2

• 1/9 m/sec.

When the initial speed is greater than the final speed, this means that ...................

• the object moves with positive acceleration

• the object moves with negative acceleration

• the object moves with positive speed

• the object moves with negative speed

A driver used the brakes to stop the car moves at speed of 20 m/sec. calculate the time taken by the car to stop. Given that the acceleration of the car equals -1 m/sec2

• 20 m/sec.

• 20 sec.

• 20 m/sec2

• 20 min.

Decelerating motion means the...................

• object speed decreases by time.

• object speed increases by time

• object speed is constant

• object is rest