Test in Grade 9 Science

Front

What angle should a water hose be aimed for maximum horizontal range?

Back

45°

Front

How much does the speed of a free-falling ball increase every second?

Back

9.8 m/s

Front

What is the range (dx) reached by a ball that travels 0.18m?

Back

0.18m

Front

What is the acceleration of a free-falling object just before it hits the ground?

Back

-9.8 m/s²

Front

What type of path does a sepak takraw ball follow when kicked from a height?

Back

Parabolic

Front

Define 'horizontal range' in projectile motion.

Back

The maximum distance a projectile travels horizontally before landing.

Front

What is the formula for calculating the range of a projectile?

Back

Range = (v^2 * sin(2θ)) / g, where v is initial velocity, θ is launch angle, and g is acceleration due to gravity.

Front

What is the value of acceleration due to gravity on Earth?

Back

Approximately 9.8 m/s².

Front

Explain the term 'free fall'.

Back

The motion of an object falling solely under the influence of gravity.

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude and direction).