How and why things move
Revision Questions (1)
- Write down the formula for average speed
- Calculate the average speed of the following animals. Show all
your working and give units.
(a) A
cheetah runs 300 m in 12.5 seconds
(b)
A Tyrannosaurus moves a
distance of 110 m in 14 s
(c) A garden snail moves a distance of 3 m in 105 s
(d) A Peregrine falcon swoops
down and covers a distance of 44.7 m in 0.5 s
3. The journey
of a car is shown below
(a) What does the size of a gradient of
this graph indicate?
(b) What does a positive gradient of
this graph indicate?
(c) What does a negative gradient of
this graph indicate?
(d) Describe what is happening in each
of the regions A, B, C, D and E
A ____________________________________________
B ____________________________________________
C ____________________________________________
D ____________________________________________
E ____________________________________________
(e) Calculate the average speed of the car in
region B
(f) Calculate the average speed of the car in
region D
4. The diagram below shows one model for the
expansion of the universe in the Big Bang theory. The graph shows how the
distance between two galaxies changes with time
Use
this graph to compare the speeds of expansion at points A, B and C.
Explain how you arrived at your answer.
5.
A digital tachograph
A digital tachograph is an electronic system for
recording driving and rest times for drivers of commercial vehicles. It records
vehicle speed, and the distance traveled. Information is stored in a memory
inside the unit and on smart cards. Each driver has their own smart card.
Explain how the fitting of
tachographs to commercial vehicles can help to improve safety on the roads.