1This Bar Chart Shows the Maximum Speeds of Various Things That Move

HELP

1This bar chart shows the maximum speeds of various things that move.

aWhat is the maximum speed of the thing powered with petrol?

bWhich is the slowest thing and how fast does it travel?

cWhich thing is twice as fast as a cyclist?

2John and James walk to school together every day. The distance from home to school is 2 km. They decide to have a race. John can run at 5 m/s and James can run at 4 m/s.

aWho will get to school first?

bExplain how you know this.

This worksheet may have been altered from the original on the CD-ROM.

CORE

3This question is about stopping a car. Remember that a car travelssome way before the driver manages to put on the brakes. This iscalled the thinking distance. The car then goes even furtherwhile the brakes bring the car to a halt. This is called the brakingdistance.

The table gives some information about the thinking and brakingdistances for the same car at different speeds.

Speed in kilometres per hour (km/h) / Thinking distance in metres (m) / Braking distance in metres (m)
45 (about 30 mph) / 9 / 14
80 (about 50 mph) / 16 / 35
105 (about 70 mph) / 21 / 75

aWhat is the total stopping distance of a car travelling at 45 km/h?

bA child runs into the road 45 m in front of a car travelling at80 km/h. Will the car hit the child? Explain how you know.

cThe driver is very tired. How and why will this affect thestopping distance?

dName one problem, other than speed, that will affect thebraking distance and say why it will affect it.

eGive one thing, other than speed or tiredness, that will increasea driver’s thinking distance.

This worksheet may have been altered from the original on the CD-ROM.

EXTENSION

4Remember the formula for speed. Use this formula to calculate the speed of the following moving objects. Don’t forget to include the unit of speed in your answer.

aA dog that runs 50 metres in 5 seconds.

bA ship that travels 100 kilometres in 5 hours.

5Here is a distance–time graph for Sally’s walk to the local shop.

Section D of the graph shows when Sally just reached the shop.

aDuring which section (A to D) did Sally stop to chat with some friends?

bHow far is it from Sally’s house to the shop?

cCalculate Sally’s average speed during section A of her journey.

This worksheet may have been altered from the original on the CD-ROM.