Explain why a seesaw is closest in arrangement to a first class lever.
  • First class levers have the fulcrum between the load and effort. This distinguishes first class levers from second and third class levers, where the load and effort are both on one side of the fulcrum.
  • Mass is a measure of an object's inertial force, or how much it resists motion, and of the amount of matter in it. Weight is the measure of gravity's pull on objects. Mass is independent of gravity, so the mass of an object will be the same on both Earth and the Moon. Because weight is dependent upon gravity, and the Earth has a greater force of gravity than the Moon, an object on the Earth will weigh more than it will on the Moon.
  • False
  • Sample Response:The seesaw is a long lever arm with the load at one end, the effort at the opposite end, and the fulcrum in the center. With both the second and third class levers, however, the fulcrum is at one end of the lever and both the load and effort are on one side of the fulcrum. The seesaw is closest in arrangement to a first class lever because it is the only class of lever with the fulcrum between the load and effort.
Second and third class levers both have __________
  • First class levers have the fulcrum between the load and effort. This distinguishes first class levers from second and third class levers, where the load and effort are both on one side of the fulcrum.
  • Velocity is how fast an object moves and acceleration is the rate of change in velocity.
  • A. the fulcrum between the effort and load B.effort applied in the same place "incorrect"C.two loads and fulcrumsD.the fulcrum at one end of the lever "correct"
  • False
What lever has resistance between the axis (fulcrum) and the force (effort)?
  • second
  • False
  • tension
  • tendons
What is the difference between velocity and acceleration?
  • tension
  • the energy an object has due to its motion
  • where the components of the lever are located
  • Velocity is how fast an object moves and acceleration is the rate of change in velocity.
What is kinetic energy?
  • tendons
  • Velocity is how fast an object moves and acceleration is the rate of change in velocity.
  • the energy an object has due to its motion
  • where the components of the lever are located
The neck is a __________
  • third class lever
  • False
  • first class lever
  • First class levers have the fulcrum between the load and effort. This distinguishes first class levers from second and third class levers, where the load and effort are both on one side of the fulcrum.
Explain the difference between mass and weight for objects on Earth and on the Moon.
  • Sample Response:The seesaw is a long lever arm with the load at one end, the effort at the opposite end, and the fulcrum in the center. With both the second and third class levers, however, the fulcrum is at one end of the lever and both the load and effort are on one side of the fulcrum. The seesaw is closest in arrangement to a first class lever because it is the only class of lever with the fulcrum between the load and effort.
  • Mass is a measure of an object's inertial force, or how much it resists motion, and of the amount of matter in it. Weight is the measure of gravity's pull on objects. Mass is independent of gravity, so the mass of an object will be the same on both Earth and the Moon. Because weight is dependent upon gravity, and the Earth has a greater force of gravity than the Moon, an object on the Earth will weigh more than it will on the Moon.
  • First class levers have the fulcrum between the load and effort. This distinguishes first class levers from second and third class levers, where the load and effort are both on one side of the fulcrum.
  • Velocity is how fast an object moves and acceleration is the rate of change in velocity.
To overcome an object's inertia, it must be acted upon by __________
  • force
  • second
  • False
  • True
The most common lever in the human body is the __________.
  • force
  • third class lever
  • False
  • first class lever
What distinguishes the three different classes of levers found in the human body?
  • Velocity is how fast an object moves and acceleration is the rate of change in velocity.
  • second
  • where the components of the lever are located
  • the energy an object has due to its motion
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