When an object has its motion changed, the cause is generally an external force . The answer is letter A. It follows Newton’s second law of motion wherein a body is at rest and remains at rest without an external force applied to move the body.
What are the 4 main types of resistance forces?
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.
What is an external force that acts against movement called?
This force is called friction . Friction is an external force that acts opposite to the direction of motion (see Figure 4.3). Think of friction as a resistance to motion that slows things down.
When the force on an object increases so does its?
From Newton’s second law the force on an object is related to the acceleration . The acceleration is directly proportional to the force applied to an object. For an object whose mass remains constant, when the force increases the acceleration increases. When the force on an object increases, so does its acceleration.
When an object has its motion changed the cause is generally?
When an object has its motion changed, the cause is generally an external force . The answer is letter A. It follows Newton’s second law of motion wherein a body is at rest and remains at rest without an external force applied to move the body.
What is the measure of an object’s mass and velocity?
Momentum depends upon the variables mass and velocity. In terms of an equation, the momentum of an object is equal to the mass of the object times the velocity of the object. where m is the mass and v is the velocity.
Which object will have the most momentum?
Two identical objects are moving in opposite directions at the same speed. The forward moving object will have the greatest momentum. An object with a changing speed will have a changing momentum.
What are the main types of resistance?
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.
Is gravity an attractive force that decreases as the mass of an object increases?
Gravity is an attractive force that decreases as the mass of an object increases .
Is air affected by human movement?
Air has mass, but not inertia. C. Air is not affected by human movement .
Can any individual can become an expert in anything?
According to Gladwell, a person could become an expert in nearly any field as long as they were willing to devote the requisite 10,000 hours to studying and practicing the subject or skill.
What distinguishes the three classes of levers in the body?
There are three types or classes of levers, according to where the load and effort are located with respect to the fulcrum . Class 1 has the fulcrum placed between the effort and load, Class 2 has the load in-between the effort and the fulcrum, and Class 3 has the effort between the load and the fulcrum.
Does human movement involves the complex interplay of many body systems?
The aerobic system starts producing energy during prolonged periods of light to moderate exercise. ... Human movement involves the complex interplay of many body systems.
Is the ankle a third class lever?
What distinguishes the three different classes of levers found in the human body? ... The ankle is a third class lever .
What is the difference between velocity and acceleration quizlet PE?
Velocity describes an object’s position and acceleration describes how fast it moves .
Which factor is directly proportional to the acceleration of an object?
The acceleration is directly proportional to the net force ; the net force equals mass times acceleration; the acceleration in the same direction as the net force; an acceleration is produced by a net force. The NET FORCE.
