Simple Machines

What is the primary function of simple machines like levers?

• To reduce friction.
• To increase weight.
• To make work easier.
• To create energy.

In a lever system, what is the effect of the lever arm's length on the force needed to lift a weight?

• Arm length has no effect.
• Longer arms require less force.
• Shorter arms require less force.
• Longer arms require more force.

What is the role of the fulcrum in a lever?

• It is the length of the lever arm.
• It is the weight being lifted.
• It is the point where the lever pivots.
• It is the force applied to lift the weight.

The lever in the video had the resistance force between the fulcrum and effort. What class of lever is that?

• Class 1

• Class 2

• Class 3

• Class 4

If the length to the effort is twice the length to the resistance, what will the spring scale read to lift a 1000g mass?

• 333 grams

• 500 grams

• 1000 grams
• 2000 grams

How do you calculate the mechanical advantage of a lever?

• length to resistance/ length to effort

• length to effort/ length to resistance

• length to effort/ height of fulcrum

• height of fulcrum/ length to resistance

A block and tackle system is a combination of what type of simple machine?

• Levers

• Wedges

• Pulleys

• Inclined Planes

What happens to the measurement on the spring scale when the weight is moved closer to the fulcrum?

• It increases.
• It decreases.
• It fluctuates.
• It stays the same.

Which of the following is an example of a lever in everyday life?

• A car engine
• A wheelbarrow
• A computer
• A bicycle

What can be inferred about the use of simple machines in ancient construction?

• They were replaced by modern technology.
• They were only used for decorative purposes.
• They were crucial for moving heavy materials.
• They were unnecessary for building large structures.