- #1
Dillion
- 39
- 0
A rock with a weight of 10 N is resting on a table. A student makes a number of statements about this situation, are they right or wrong?
1. "The weight of the rock is a force of 10 N by gravity in the downward direction"
I don't see anything wrong with this.
2. "The reaction force to this weight is a force of 10 N exerted on the rock by the table in the upward direction"
I don't see anything wrong with this either.
3. "The normal force exerted on the rock by the table is a force of 10 N; the reaction force to this normal force is a force of 10 N exerted on the rock by gravity in the downward direction"
*Gravity does not exert 10 N of force on the rock. The rock is exerting a force of 10 N in the downward direction. The mass of the rock would be 10 = m (9.8) would be 1.02.
4. "If the 10 N rock is lifted off the table by a hand that exerts a force of 12 N upward on the rock, the reaction force to this 12 N force is a force of 10 N exerted on the hand by the rock in the downward direction"
I don't see anything wrong with this either...Please let me know if I'm right or missing any key concepts! Thank you so much!
1. "The weight of the rock is a force of 10 N by gravity in the downward direction"
I don't see anything wrong with this.
2. "The reaction force to this weight is a force of 10 N exerted on the rock by the table in the upward direction"
I don't see anything wrong with this either.
3. "The normal force exerted on the rock by the table is a force of 10 N; the reaction force to this normal force is a force of 10 N exerted on the rock by gravity in the downward direction"
*Gravity does not exert 10 N of force on the rock. The rock is exerting a force of 10 N in the downward direction. The mass of the rock would be 10 = m (9.8) would be 1.02.
4. "If the 10 N rock is lifted off the table by a hand that exerts a force of 12 N upward on the rock, the reaction force to this 12 N force is a force of 10 N exerted on the hand by the rock in the downward direction"
I don't see anything wrong with this either...Please let me know if I'm right or missing any key concepts! Thank you so much!