Grade9 second week

Write the scientific term:

A method used by physicists to predict the mathematical relation between physical

quantities

A bus starts from rest and reaches 20 m/s in 5 seconds. Its acceleration is ………

• 2 m/s²

• 4 m/s²

• 5 m/s²

• 10 m/s²

Two cars move towards each other. One with speed 40 km/h and the other with 60 km/h. Their relative speed is ………

• 20 km/h

• 40 km/h

• 60 km/h

• 100 km/h

A body covers 100 m in the 1st 10 seconds, and 200 m in the next 10 seconds. Its motion is ………

• Uniform

• Non-uniform

• Constant

• Relative

A car increases its velocity from 20 m/s to 40 m/s in 10 seconds. What is its acceleration?

• 1 m/s²

• 2 m/s²

• 3 m/s²

• 4 m/s²

Which quantity describes rate of change of velocity?

• Speed

• Acceleration

• Force

• Distance

If acceleration = 0, motion is ………

• Uniform

• Accelerated

• Decelerated

• Vibratory

If speed is constant, acceleration is ………

• Positive

• Negative

• Zero

• Infinite

Speed measures how fast a body ………

• Changes velocity

• Moves

• Accelerates

• Stops

Acceleration measures how fast ………

• Speed changes

• Distance changes

• Time changes

• Mass changes