Quiz 5: Simple Machines and Levers Quiz

What did Archimedes describe as the fundamental principle behind the lever?

• Magic spells

• Basic laws of physics

• Ancient Greek mythology

• Alchemy

What is the main purpose of a lever?

• To perform impossible feats

• To lift heavy objects directly

• To create magic illusions

• To reduce the amount of energy required for a task

What are the three main components of a lever?

• Lever arm, pivot point, weight

• Effort arm, resistance arm, fulcrum

• Force, distance, weight

• Length, balance, magnitude

What is the relationship between the magnitudes of the forces and their distances from the fulcrum in a balanced lever?

• The product of the effort force and the length of the effort arm equals the product of the resistance force and the length of the resistance arm

• The effort force is always greater than the resistance force

• The length of the effort arm is always greater than the length of the resistance arm

• The resistance force is always greater than the effort force

What is the work measured in joules equal to, according to the basic laws of physics?

• Force applied over distance

• Force applied over area

• Force applied over speed

• Force applied over time

What does a lever do to make lifting a weight easier?

• It reduces the weight of the object

• It changes the center of gravity of the object

• It increases the force needed to lift the object

• It disperses the weight across the entire length of the effort and resistance arms

How can a lever help in lifting a heavier object?

• By changing the center of gravity of the object

• By dispersing the weight across the entire length of the effort and resistance arms

• By reducing the distance from the fulcrum

• By increasing the force needed to lift the object

What is the weight of the Earth?

• 6 x 10^24 kilograms

• 3.7 meters long

• 1.5 billion times the distance to the Andromeda Galaxy

• 384,400 kilometers

How long would a lever need to be to lift the Earth using the Moon as a fulcrum?

• 40.6 kilometers

• 10 meters

• 3.7 meters

• 1.5 billion times the distance to the Andromeda Galaxy