Case I.) You hold a brick at rest in your hand. a.) How many forces act on the b

Question

Case I.) You hold a brick at rest in your hand.

a.) How many forces act on the brick? (Make sure you can name them.)


b.) Are these forces:
opposite in direction?
equal in size?
an action-reaction pair?

Case II.) You now accelerate the brick directly upwards.

a.) How many forces act on the brick now? (Neglect air resistance. Make sure you can name them.)


b.) Are these forces:
opposite in direction?
equal in size?
an action-reaction pair?

Final summary:
What is the action-reaction pair of the force of gravity acting on the brick?
and which way does it point?

What is the action-reaction pair of the normal force acting on the brick?
and which way does it point?

Explanation / Answer

case 1(a) there are two forces, normal force in upward direction and gravitational force in downward direction.

(b)Are these forces:
opposite in direction?yes
equal in size?yes
an action-reaction pair?No

case 2)there are still two forces, normal force in upward direction and gravitational force in downward direction but the upward force is more then downward gravitational force.

(b) Are these forces:
opposite in direction?yes
equal in size?No
an action-reaction pair?No

final summary; (a) the force exerted by brick on earth in upward direction

(b)the action-reaction pair of the normal force acting on the brick is the force exerted by brick on the hand in downward direction.

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