A goniometer measures __________.
Which of the following is NOT a factor in efficiency?
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.
What tissue connects muscles to bones?
Earth's gravity acts upon objects with a steady force of __________.
Human muscles have an efficiency of about __________.
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 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.
Describe the four main types of resistance forces.
The four main resistance forces are objects with mass, inertia, and momentum; friction; gravity; and air resistance. Objects with mass are able to provide resistance by colliding with other objects. Friction slows objects down by providing a steady resistance when the objects are in contact with and rubbing against a surface. Gravity provides a steady downward pull towards the center of Earth's mass. Air resistance is the cumulative force provided by millions of oxygen atoms being displaced.
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.
When an object has its motion changed, the cause is generally __________.
How might being too strong actually restrict a joint's range of motion?
If excess muscle is too bulky it can interfere with the motion of a joint, which means that too much muscle strength can reduce a joint's range of motion and can actually reduce flexibility.
What differentiates extension from hyperextension?
Which object would have the most momentum?
The carpal bones in the wrist are an example of __________.
Which of the following is NOT a factor in efficiency?
A goniometer measures __________.
How might being too strong actually restrict a joint's range of motion?
Explain why synovial joints have greater flexibility than fixed and cartilaginous joint.
What is kinetic energy?
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