Gravitational Acceleration and Free Fall

All objects around us are pulled towards the centre of Earth by

• Gravitational force

• Gravitational acceleration

• Gravity attraction

• Gravity free fall

Galileo Galilei dropped two rocks of different mass from the top of the Leaning Tower of Pisa. Which rock will reach the ground first

• The bigger rock

• The smaller rock

• Two rocks reached the ground almost the same time

Free fall is the motion of an object due to (a)   force only

What causes the astronauts to float in the space ship?

• No air resistance

• No gravity force

• No air

Which of the following graph best represents an object moving against gravitational force?

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What is the acceleration of the falling person by assuming that no air resistance acting on him?

• $9ms^2$

• $10ms^2$

• $100ms^2$

• $0.1ms^2$