Three rubber wheels, A, B and C are touching so that if one moves the others must also move. If wheel A turns clockwise, which way will wheel turn?
A section through a dam is shown. At which point is the dam strongest?
In the same dam, at which point is the water coldest?
The beam is twice as thick at one end as the other. At what point can it be placed on the wall, and at a right angle to the wall, so that it balances?
When rays of light hit a lens, in which direction do they continue?
A band passes around all the wheels so that they can all be turned by the driving wheel. When the driving wheel turns clockwise, which way does wheel W turn?
The drawing shows a cross-section of a wall, with a shelf upright against it. By means of a hinge, the shelf can be folded upright against the wall. It can be let down to the horizontal, being held at point H by a rope, which is suspended from a hook, A, B or C. When the shelf is let down and supported by the rope, which hook is least likely to be pulled out of the wall?
If the three iron bars are all the same length, which one will support the greatest weight?
Three racing cars travel at equal speed round the built-up curve of a bend. Which car is most likely to slip?
If three racing cars are level with each other, side by side as they go into the bend, and all are also level as they come out of the bend, which car is travelling fastest?
To lever up the large, heavy weight with the least effort, by pushing down in the direction of the arrow, at which point under the beam should the block be placed
A heavy metal bar is fixed inside a cardboard tube. When the tube is placed on a slope, as shown, which direction will the tube roll?
When the driving wheel 1 turns in the direction shown, wheel 2 turns?
Assuming that the belt and wheels did not jam, which wheel would turn fastest?
Two cars, A and B, one travelling from the North, N, due south, S, and the other from the west, W, due east, E, collide at point P. They come to rest in the region of south east, as shown. If the slower car was travelling exactly at the speed limit, which car was probably breaking the speed limit?
The ladders, 1 and 2, and the walls are viewed from the side. Which ladder is safer when climbed?
In a hot-water cylinder, from which outlet should hot water be taken?
When the spacecraft is not affected by the Earth’s gravity, and the thrust of the rocket is zero, the astronaut will
In space, when the stationary vehicle accelerates, the spaceman will
When wheel 1 turns clockwise, which way does wheel 4 turn?
In which direction does a steel ball continue after impact on a rigid, heavy steel block?
In which direction will ball 3 move when ball 1 is struck as shown?
Which way will helical gear H turn when helical gear M turns as shown?
