Measuring Motion
A hiker's velicity begins at 1.8m/s uphill and changes to 1.5 m/s uphill. How do you know that the hiker has a negative acceleration?
To produce change in motion, a force must be a(n)
What is an unbalanced force?
When a mover puts furniture on wheels, which type of friction is the mover using to make the job easier?
What is rolling kinetic friction?
A measure of the gravitational force exerted on an object
What is weight?
A force of attraction between objects that is due to their masses and the distance between them
What is gravity?
The equation for speed
What is distance/time?
The push or pull that always acts on an object.
What is a force?
A force that always acts to oppose motion
What is friction?
As the distance between two objects increases, the force of gravity between them __________.
What is decreases?
An object that appears to stay in place and that helps you detect motion in another object.
What is a reference point?
A change in a moving object's speed or direction.
What is acceleration?
What is net force?
Pouring sand on ice: Increase or Decrease friction.
What is increase?
The measure of the amount of matter in an object.
What is mass?
The SI unit for force
What is a newton?
The speed of an object in a particular direction.
What is velocity?
When the net forces equal 0N, they are what type of force?
What are balanced forces?
This happens to friction if the force pushing surfaces together increases.
What is increases?
The law of universal gravitation says that gravitational force is
What is related to mass and distance?
Rolling and Sliding are types of this kind of friction.
What is kinetic friction?
starting velocity, final velocity, time it takes to change velocity
The net force on an object when you combine a force of 10N north with a force of 5N south
What is 5N north?
Is the amount of friction greater between rough surfaces or smooth surfaces?
What is rough surfaces?
If a student has a weight of 420N on Earth, what is the student's weight on the moon (Moon's gravity = 1/6 of Earth's gravity)
What is 70N?
What is static friction?