C5 - Forces and motion

Question 1

UVAST Equation 1

Answer 1

v = u+at

Question 2

UVAST Equation 2

Answer 2

2as = v^2 - u^2

Question 3

UVAST Equation 3

Answer 3

s = ut + 1/2 at^2

Question 4

Solving Motion Problems

Answer 4

Try to visualise what is happening in the problem by drawing a simple diagram, including vectors where appropriate, of the situation.
If the problem involves a change of direction, call one direction positive and the other negative.
Identify all of the facts given to you in the question, as well as assumed values (eg. acceleration due to gravity, initial/final velocity of zero) and write them down so you can select the correct equation to use.
Make sure you convert all values given to you in a problem to SI units before you use them in any formula.
Remember to show your working and make sure you use the appropriate number of significant figures in your answer.

Question 5

Vector notation

Answer 5

Requires an arrow, to indicate the direction clearly. The magnitude of the vector must also be labelled clearly.

Question 6

Addition of multiple vectors

Answer 6

Resultant vector is found by joining the starting tail to the final head.

Question 7

Changes in velocity

Answer 7

To subtract vectors, they must be in the same direction, so if they are not, the second vector can be reversed and added.