Foundation November 2017 Paper 1 Q23
23 Anil’s home is 1 km from a shop.
He walked from home to the shop at a constant speed in 10 minutes.
He stayed at the shop for 5 minutes.
He walked home at a constant speed in 8 minutes.
Anil drew this distance-time graph to represent his journey.
Make two criticisms of his graph. [2 marks]
| Answer | Mark | Comments |
|---|---|---|
| Valid criticism referring to the line from (0, 0) to (10, 1) | B1 | eg there shouldn’t be a curve need to be specific about the line shape, it is not sufficient to simply say it is wrong |
| Valid criticism referring to the line from (15, 1) | B1 | oe eg he never goes 2 km from home |
Additional guidance
| Criticisms can be in either order | |
| A correct diagram takes precedence over statements, otherwise ignore diagram | |
| For first B1: | |
| The first part is curved | B1 |
| The curve should be a straight line | B1 |
| He has drawn a curve for constant speed | B1 |
| The line is curved which shows his speed was not consistent/constant | B1 |
| He’s not going at a constant speed to the shop (correct referral to graph) | B1 |
| All lines should be straight | B1 |
| Constant speed should be a diagonal/straight line | B1 |
| The line shouldn’t curve | B1 |
| The constant speed should be [a sloping straight line sketched] | B1 |
| The curved line shows he decreased speed | B1 |
| It should be a straight line from 0 to 10 | B1 |
| It should be a straight line at the start | B1 |
| A distance-time graph shouldn’t have curves | B0 |
| It should be a straight line ( ‘It’ seems to be referring to the whole graph) | B0 |
| The curved line shows he increased and decreased speed | B0 |
| He was walking at a range of speeds, so not consistent (referral to whole graph) | B0 |
| The constant speed is drawn incorrectly (how?) | B0 |
| The lines should be curved or straight, not both | B0 |
| The curve should be a line of best fit | B0 |
| It should be a straight line from 0 to 15 (it should be to 10) | B0 |
| The curve is wrong (how?) | B0 |
| For 2nd B1: | |
| The line should go down at the end | B1 |
| He isn’t walking home, he’s walking further away | B1 |
| He has walked away from home when he hasn’t | B1 |
| The line should go back to the bottom of the graph | B1 |
| The graph should return to zero | B1 |
| The last part should be decreasing (instead of increasing) | B1 |
| The line for him walking home should have negative gradient | B1 |
| The graph shows he didn’t walk home | B1 |
| The line for him walking home should have negative correlation | B0 |
| The line for the journey home goes the wrong way | B0 |
| The graph does not show his journey home | B0 |
| His house is 2 km away from the shop | B0 |
| The line should be decreasing instead of increasing (which line?) | B0 |
| His home is 1 km from the shop not 2 km | B0 |