A. Write the number of the correct answer in the brackets.
B. Write "T" for true and "F" for false.
1. Which of the following are simple machines?
(c) Sloping plank.
(a) , (b) & (c).
(a) , (b) & (d).
(b) , (c) & (d).
All of the above.
2. Which one of the following is FALSE about machines. () (1)
Make work easier.
Create more energy.
Increase the speed of work.
Change the direction of a force.
3. One of the advantages of using levers is ________. () (1)
using a small force to overcome a heavy load
using a large force to overcome a small load
the effort can be applied anywhere along the lever
the load can be placed anywhere along the lever
4. Which one of the following is TRUE about fixed pulley. () (1)
The force and load move in the same direction.
A small force can overcome a heavy load.
The pulley rotates in one direction only.
It changes the direction of a force.
5. In a wheel and axle system, if the load and axle diameter remain unchange but the diameter of the wheel is decreased then ________. () (1)
more effort is needed
less effort is needed
the same amount of effort is needed
depends on the speed of wheel rotation
6. 2 boys of different weight sat on either end of a see-saw. In order for the see-saw to balance horizontally, what must be done? () (1)
The heavier boy must press lightly on the plank.
The lighter boy must press lightly on the plank.
The heavier boy must move nearer to the pivot.
The lighter boy must move nearer to the pivot.
7. Which of the following machine makes use of gears? () (1)
8. When you are reeling in a fish using a fishing rod, ________. () (1)
the fulcrum is between the effort and load
the effort is between the fulcrum and load
the load is between the effort and fulcrum
it is not a lever system
9. Which statement about gears is FALSE? () (1)
Gears have teeth around its circumference.
Gears are made only from steel.
Gears can change the direction of a force.
Gears come in different sizes of diameter.
10. The fulcrum in a wheel and axle is located at the ________. () (1)
circumference of the wheel
circumference of the axle
centre of the axle and wheel
joint to the load
C. Fill in the blanks with the most suitable word.
1. Without machines, man has to depend on his muscles and the muscles of animals to help him do work.
() 2. In all machines, the effort and load are exactly equal.
() 3. When 2 gears are engaged to one another, they rotate in the same direction.
() 4. The see-saw is one example of a lever and fulcrum system.
() 5. The movable pulley requires less effort than a fixed pulley when moving the same load.
() 6. Machines can work by themselves without any forces.
() 7. In a lever, the fulcrum must always be between the effort and the load.
() 8. A pulley is a grooved wheel.
() 9. In a movable pulley, the load and effort move the same distance.
() 10. The screwdriver is an example of a wheel and axle.
1. A lever is supported at a fixed position known as the ____________.
2. When we use our lower arm to lift an object, the fulcrum is our ____________.
3. In a bicycle, the 2 gears are connected by a ____________.
4. An inclined plane is also known as a ____________.
5. The 3 main parts of a simple machine are ____________ , ____________ and ____________.