F2 - SEM2 - Force and motion - 11.5 Action and reaction

Question 1

Explain why you feel pain when you hit a wall

Answer 1

Forces always occur in pairs
When you exert a force on the wall, the wall also exerts a force on you

Question 2

How do we call the paired forces?

Answer 2

Action and reaction

*** study the practical on P.188 - 191

Question 3

Explain what is action and reaction

Answer 3

Force always occur in pair
When object A exert a force on object B (action), object B exert a force of equal size on object A in opposite direction (reaction)

Question 4

How to draw action and reaction?

Answer 4

The arrows of action and reaction should be the same length and in opposite direction.
Label each arrow clearly

Question 5

Give examples of action-and-reaction pairs

Answer 5

When you exert a force on the wall of swimming pool, the wall exerts a force of equal size on you in opposite direction - This force pushes you away from the wall
When you jumps you exert a downward force on the ground, the ground exerts an upward force of equal size on you - the force push you into the air
When the ballon of ballon rocket deflates and pushes the air to the right, the air exerts a reaction force on the balloon to the left, the ballon moves towards left.