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the combination of air and heat cause the ballon to expand, therefore, the ballon will float.
The forces acting on a falling body are gravity and air resistance.
Air pressure.
The main forces acting on a projectile are gravity, and air resistance.
air resistance, gravity
the combination of air and heat cause the ballon to expand, therefore, the ballon will float.
The forces acting on the bike is gravity, air resistance and friction.
Air resistance and gravity and forces
Air resistance and gravity.
aeronautics
Air resistance(AKA drag), gravity
The forces acting on a falling body are gravity and air resistance.
Gravity and air resistance.
Air pressure.
The main forces acting on a projectile are gravity, and air resistance.
Viscous drag
Gravity (downwards), and air resistance (upwards).