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Help please Last one. 10 across 4,11

Basic force from all of us alike puuting energy into steady pull.

W-A-, I-T-R-C-I-N

Must be staring me in the face but I can't see it. Want it to be something interaction

Weak Interaction

Weak interaction.

Thanks Dandelion. I could see that these words fitted but have never heard the phrase. How is it usually used?

WE
AKIN
T(e)RATION
= Basic Force

Sorry, I missed out the C in T(e)RACTION

Thanks again Dandelion. Have never heard the words weak and interaction used together like this before. Will try to remeber.

There are 4 fundamental forces in Physics:
strong interaction, weak interaction, electromagnetic interaction and gravitational interaction.

Thankyou Xman. You have solved the riddle for me. Clearly O Level General Science either didn't cover this or else I wasn't paying attention! Really appreciate your explanation as it was niggling at me.