Gravity
Define gravity.
Gravity is an attractive force that exists between all objects that have mass.
What causes fricion?
Microscopic bumps on surfaces and/or weak attractive forces between objects or surfaces.
Penatly
- 200
What is the equation for Newton's 2nd law?
a = f/m
Contact force and noncontact force?
Contact forces are where object are touching. Noncontacts forces are where the objects are not touching.
Penalty
-100
What is the difference between sliding and static friction?
Sliding friction is the friction that opposes the motion between 2 objects moving past each other. Static friction is friction that happens on non-moving object, that keeps the object in place.
Based Newton's 1st law what happens to an object at rest if no forces act on it?
The object will remain at rest or not move.
According to Newton’s second law, what happens to the motion of an object when the force increases and mass stays the same?
The object's acceleration will increase.
What are the units for force?
Newtons
How is weight different from mass?
Weight is the force of gravity. Mass is just the amount of matter in an object. Weight can change, but mass cannot.
Which would have more fluid friction? Peanut butter or water? Explain why?
Peanut butter would have more fluid friction because it is thicker, meaning it opposes motion more or is harder to move through.
What is the net force on a box that is being pushed by two people on the left? Person 1 is pushing with a force of 20 N and person 2 is pushing with a force of 30 N. Include the force and direction in your answer.
50 N to the left
If a force is applied in a direction other than that of the object’s motion what will happen to the object's motion?
The object will slow down and/ or change direction.
Gift
+500
What is the law of universal gravitation?
States that all objects are attracted to each other by a gravitational force.
Gift
+ 500
Identify the net force an object that a force of 250 newtons to the right and 100 newtons to the left. Include the force and direction in your answer.
150 newtons to the right
You push a 20 kg box with a force of 200 N what is it's acceleration?
10 m/s2
Define centripetal force.
A force that acts perpendicular to the direction of motion, toward the center of the curve.
What happens to gravity as mas gets larger? What happens when distance between objects increases?
As mass gets larger gravity increases. As distance between objects increases, gravity decreases.
What happens when you reach the limit of static friction?
The object will move.
Newton's first law is also known as the law of ________?
Intertia
-600
Define intertia.
An object resistance to change in motion