Q6. Forces On A Ball Thrown Into The Air (a projectile):

More information: To understand this properly requires some explanation of vectors - It is a good opportunity to introduce the word 'vectors', and to help understand the difference between velocity and acceleration:

The golf ball in a previous question was hit 'forwards' as well as 'up'. In this question, the ball is thrown straight up into the air so that it can be caught as it falls back to earth.

Simulation: Projectile motion simulator

Sally selected two projectiles to fire from a circus cannon:

1. A human cannonball
2. A grand piano

Sally set the cannon to fire using the following settings:

• Angle = 18 degrees
• Initial Speed = 18 metres per second
• Air resistance = none

Sally's hypothesis was that a human cannonball would travel further (range wouold be greater) compared with a grand piano.

Sally used the Simulation: Projectile motion simulator to perform her experiment.

• Was Sally's hypothesis correct?
• What are the reasons for your answer.

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