Note:
Use Q1 and Q5 from Speed, Distance and Time and Q3 and Q4 from density, mass and volume.
Speed and Density FSQ2
In 2009, Usain Bolt set the Men’s 100m sprint world record in 9.58 seconds.
Speed and Density FS2(a)
Calculate his speed over this distance in m/s, assuming it is constant.
Give your answer to two decimal places.
Answer type: simple
Answer: 10.44 (m/s)
Workings:
Speed = distance \div time, so
Speed = 100 \div 9.58= 10.44 m/s (1 d.p.)
2 marks
Speed and Density FS2(b)
Using your rounded answer from part (a), estimate how far Usain Bolt would be able to run in 2 minutes, assuming he was able to maintain this speed.
Give your answer to 1 decimal place.
Answer: 1252.8 (m)
Workings:
2 minutes is equal to 120 seconds
The distance is equal to speed \times time, so
Distance = 10.44\times 120 = 1252.8 m
2 marks
Speed and Density FSQ6
Molly wants to measure the density of a block of ice.
She measures the mass of the block to be 10.2 g
She then measures the volume by placing the ice into a beaker of water and measuring the change in volume, as shown in the diagram below:
The initial water level in the beaker was 25.0 cm^3
The water level after the ice was added was 36.1 cm^3
Calculate the density of the ice in g/cm^3
Give your answer to two decimal places.
Answer type: simple
Answer: 0.92 (g/cm^3)
Workings:
The volume of ice is equal to 36.1-25.0 = 11.1 cm^3
The density is given by the mass \div volume:
Density = 10.2 \div 11.1 = 0.92
3 marks