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15 Safia investigates friction.
She lets a car roll down a slope.
She measures the time it takes for the car to reach the floor.
car
books
slope
floor
Safia changes the material on the slope.
Here are her results.
material time in
seconds
plastic 2.2
wood 3.1
paper 3.0
card 2.9
wool 3.7
Complete the sentences about her results.
The material that made the car move the slowest is .
This is because this material .
[2]
© UCLES 2019 0846/02/O/N/19
