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# M1 help watch

1. http://www.examsolutions.net/a-level...June/paper.php

Hi,
Can someone please help me with 8e. I have managed to do the rest of q8 correctly. But, in part e, I understand how to do it - just don't get that to find the new acceleration why is tension no longer acting on particle q

Thank you
2. (Original post by Ann1234)
http://www.examsolutions.net/a-level...June/paper.php

Hi,
Can someone please help me with 8e. I have managed to do the rest of q8 correctly. But, in part e, I understand how to do it - just don't get that to find the new acceleration why is tension no longer acting on particle q

Thank you
The tension will be zero because the two masses are decelerating at the same rate.

The coeff. of friction is the same for each mass. The frictional force on each mass is and the deceleration will be for each mass.

If the coeff. of friction were higher for the first mass (P), then there would be tension still.

Rather a poor video, IMO, as they should bring out that point.

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