A lamp hangs at rest from a ceiling on a cable.
The weight of the lamp is 15 N.
The Table describes four forces, P, Q, R and S.
Table
| Force | Description |
|---|---|
| P | gravitational force of the Earth on the lamp |
| Q | force of the cable on the lamp |
| R | force of the lamp on the cable |
| S | gravitational force of the lamp on the Earth |
Give the size and the direction of force S.
Force P and force Q are equal in size and opposite in direction.
Explain why force P and force Q are not an interaction pair.
Give the letter of the force that forms an interaction pair with force Q.
Give the letters of the two non-contact forces in the Table.
The cable breaks.
Describe what happens to forces P, Q and R immediately after the cable breaks.