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Look at the image of the pulley. If bucket A has a mass of 5 kg, which of the following statements is true about the minimum effort force required to lift the bucket if friction is ignored?
1. it would take 0 kg of effort to lift the bucket
2. it would take 2.5 kg of effort to lift the bucket
3. it would take 5 kg of effort to lift the bucket
4. it would take 10 kg of effort to lift the bucket
An object being lifted or moved by a machine is a:
1. fulcrum
3. work
4. force
5. friction
What are two examples of an inclined plane?
1. lever and screw
2. screw and wedge
3. wedge and lever
Machine with a bar that pivots on a fixed point
1. watt
2. pulley
3. wheel and axle
4. lever
Comparing a machine's work output with work input
1. watt
2. mechanical efficiency
4. joule
What is the work done by a machine on an object?
1. power
2. work input
3. work output
4. lever
What is the formula for mechanical advantage?
1. input force divided by output force
2. output work divided by input work
3. output force divided by input force
A wheelbarrow is an example of
1. second-class lever
2. wheel and axle
3. inclined plane
What is the purpose of a simple machine?
1. So we can do less work
2. To create energy
3. To make work easier
4. To create friction