Explain how Newton's law of inertia describes the motion of objects.
Newton's law of inertia states that an object at rest stays at rest, and an object in motion continues moving at a constant speed and in a straight line, unless an unbalanced external force acts on it.
Explain why a seesaw is closest in arrangement to a first class lever.
A seesaw is like a first-class lever because its fulcrum is positioned between the effort applied on one side and the load on the other side.
To overcome an object's inertia, it must be acted upon by __________.
What is kinetic energy?
Explain the difference between mass and weight for objects on Earth and on the Moon.
Mass is the amount of matter in an object and remains the same on Earth and on the Moon. Weight is the force of gravity on the object, so an object weighs about one-sixth as much on the Moon as it does on Earth.
Explain what is meant by the term mechanical advantage.
Mechanical advantage is the ratio of the force a machine produces to the effort force applied to it. It describes how much the machine multiplies force.
Explain what distinguishes first class levers from second and third class levers.
First-class levers have the fulcrum between the effort and the load. Second-class levers have the load between the fulcrum and effort, while third-class levers have the effort between the fulcrum and load.
The most common lever in the human body is the __________.
The neck is a __________.
What tissue connects muscles to bones?
The most common lever in the human body is the __________.
The neck is a __________.
Explain what distinguishes first class levers from second and third class levers.
Explain how Newton's law of inertia describes the motion of objects.
What is kinetic energy?
Explain what is meant by the term mechanical advantage.
Explain the difference between mass and weight for objects on Earth and on the Moon.
What tissue connects muscles to bones?
Explain why a seesaw is closest in arrangement to a first class lever.
To overcome an object's inertia, it must be acted upon by __________.
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