The lever displayed below is of class:
I
II
III
I and II
Classify the following into levers as class I, class II or Class III :
(a) a door (b) a catapult
(c) a wheel barrow (d) a fishing rod.
A man uses a crowbar of length 1.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever and calculate the effort needed.
A man uses a crowbar of length 2.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever used and calculate the effort needed.
Classify the following into levers as class I, class II or class III: 1. A door 2. Catapult 3. Wheelbarrow 4. Fishing rod.