Air and water resistance

1. Water
Water exerts forces on any object.
There are two types of force

2. It’s a force that pushes things up.
That’s why we float in water. You can feel
it when you hold down a floating object
1) Upthrust force

3. When walking or swimming through
the sea or swimming pool, you feel
that water is pushing you back.
2) Water resistance

4. A streamlined ship that has a narrow
shape produces low resistance because
the amount of water pushing against it is
relatively small.

5. Air
Air exerts forces on any object.

6. Air resistance

7. Air pushes against a moving object. Air
resistance slows down a moving object.
If the object is big in size, the air resistance is
also big and the opposite.

8. Air resistance can be very useful. The
push of the air on a parachute slows
the fall of the object

9. Free fall
Hang-gliding Parachutes Gliding

10. Free fall
Hang-gliding Parachutes Gliding