Take g = 9.8 Nkg-1
1. Write down
three things that travel in a circle stating each time the type of force needed
to give circular motion. (THEY MUST BE DIFFERENT TYPES OF FORCE)
2. Which of
the following correctly describe the motion of a satellite in orbit round the
Earth:
(a) constant speed (b) constant velocity (c) constant
acceleration (d) constant accelerating force
3. Why do
astronauts feel heavier in a centrifuge?
4. What is the
name of the force that makes objects move in a circle?
5. A stone of
mass 4kg is tied to string and swung in a horizontal circle of radius 2m with a
speed of 4ms-1.
(a) what is the force on the stone?
(b) how many revolutions does the stone make every
second?
(c) in what direction will the stone move if the
string is cut?
(d) what will the force become if the radius of the
orbit is halved?
6. The force
of friction between a certain car and the road is 10 000N. If the mass of the
car is 1000 kg what is the maximum speed that it can take a corner of radius
40m?
7. How can a
stone on the end of a string be spun round at a constant speed and yet still
experience a force?
8. Describe
carefully the effect on the passengers in a bus that corners quickly. Your
answer should include a plan view to show which way the passengers move.
9. Calculate
the acceleration of a 3kg mass travelling in a circle of radius 2m at a
constant speed of 6ms-1.
10. A stone is
swung round in a vertical circle. At which point in the circle is the string
most likely to break and why?
11. “A satellite
in orbit is continually falling round the Earth”. Explain this statement.
