simple m1 question (short)
when using deceleration in a Suvat formula do we automatically use a minus sign in it when plugging it into a formula?
eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)
cheers
eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)
cheers
Original post by upthegunners
when using deceleration in a Suvat formula do we automatically use a minus sign in it when plugging it into a formula?
eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)
cheers
eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)
cheers
depends on the +ve direction chosen
Original post by upthegunners
when using deceleration in a Suvat formula do we automatically use a minus sign in it when plugging it into a formula?
eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)
cheers
eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)
cheers
Original post by TenOfThem
depends on the +ve direction chosen
its that question, it's only 2 marks but using the values I have stated (without taking the minus of the acceleration) I got 30.1m/s which is impossible as he is decelerating from 20m/s..
Original post by upthegunners
when using deceleration in a Suvat formula do we automatically use a minus sign in it when plugging it into a formula?
eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)
cheers
eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)
cheers
when choosing right as the positive direction, I would use the formula normally, and yeah you would use -1.5 for a
Original post by upthegunners
its that question, it's only 2 marks but using the values I have stated (without taking the minus of the acceleration) I got 30.1m/s which is impossible as he is decelerating from 20m/s..
its that question, it's only 2 marks but using the values I have stated (without taking the minus of the acceleration) I got 30.1m/s which is impossible as he is decelerating from 20m/s..
In that case -ve as you will be looking at +ve t
Original post by TenOfThem
In that case -ve as you will be looking at +ve t
what do you mean?
Original post by upthegunners
what do you mean?
Sorry, complete lack of clarity in my previous response
Graph questions (and horizontal motion generally) just has +ve "to the right" or in the direction of +ve time
When I mentioned +ve direction I was really referring to vertical questions
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