Contact vs. Noncontact forces
An example of a contact force.
normal force, air resistance, friction, tension
Define a reference point?
A stationary object used to determine if another object is in motion.
Define balanced forces.
Forces that are equal in size and opposite in direction
Define friction.
What is "a force that opposes the motion of objects sliding past one another"?
What does the length of a force vector arrow indicate?
The magnitude (strength) of a force
An example of a non contact force.
What is gravity, electrical, magnetic force
Describe how an motion can appear different depending on your reference frame.
An object might seem stationary from one reference point but in motion from another (example: passenger moving in a moving car).
Define unbalanced forces
Forces that are not equal in magnitude, causing a change in motion, direction, or speed of an object
The kind of friction that helps you walk without slipping.
What is static friction?
This type of force causes a change in motion.
What is an unbalanced force?
Name two main components all forces have
magnitude and direction
Describe how you know an object is in motion.
Its position changes relative to a reference point
When the net force is zero, is the object balanced or unbalanced?
balanced
What type of surface reduces friction?
Smoother surfaces
Newtons (kg x m/s^2)
This force responsible for keeping the moon in orbit around Earth.
What is gravity?
Describe qualities that make a good reference point.
stationary/not moving, easy to observe
If an object is pushed with 10N to the right and 2N to the left, what is the net force?
8N right
What type of surfaces increases friction?
Rougher surfaces
The type of friction drag is.
What is fluid friction?
Non contact force that can attract or repel objects
What is magnetism?
Finish the phrase: Motion is
_______.
What is relative?
If an object is pulled down with 240N and pushed up with 126N, what is the net force acting on the object?
114N up
Which type of friction is the strongest?
static friction
The net force is 20N in that direction.