## Glossary of Laws of Motion Test

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- What is a change in velocity for some time interval? Formula for it?
- acceleration, change in velocity divided by time

- What is any push or pull on an object?
- a force

- What do forces cause?
- acceleration, go slower or faster, change direction

- Force is measured in what unit?
- Newtons

- What are the two types of forces?
- Contact and field

- Which type of force is where objects collide causing acceleration?
- contact force

- Which type of force operates over an open space?
- field force

- Name the four types of field forces.
- gravity, electromagnetic, weak nuclear, strong nuclear

- What is the difference between weak and strong nuclear forces?
- Stong happens inside the nucleus and is the strongest known force. Weak happens outside the nucleus causing radioactivity.

- What is the theory attempting to prove all four field forces are the same thing?
- Grand Unification Theory

- With a field force the ________ you get the stronger the force becomes.
- closer

- What is Newton's first law of motion?
- Objects remain at constant velocity unless acted upon by an outside force.

- What is Newton's 2nd law of motion?
- Acceleration of an object is inversely proportional to an object's mass and directly proportional to the applied force.

- What is the formula used to find force or net force?
- f=(m)(a); force equals mass times acceleration

- What is Newton's 3rd law?
- For every action, there is an equal and opposite reaction.

- What is the sum of all forces acting on an object?
- the net force

- What is the pull of gravity on an object's mass?
- weight

- What is the difference between mass and weight?
- Weight is a force and vector measured in Newtons. Mass is a fundamental quantity (scalar) measured in kilograms.

- A normal force is ________ to the surface an object is resting on.
- perpendicular

- What force opposes motion?
- friction

- What are the two types of friction? What is the difference between the two?
- Static opposes the start of motion. Kinetic opposes motion in progress.

- What is the formula for the coefficient of static friction?
- ìs=Fs/Fn

(coefficient equals the force of static friction divided by the normal force)

- What is the formula for finding the coefficient of kinetic friction?
- ìk=Fk/Fn

(The coefficient equals the force of kinetic friction divided by the normal force)

- What are the three types of kinetic friction? Describe each briefly.
- 1)sliding- surface to surface motion with no rotation

2)rolling- one or more objects are rotating

3) fluid- movement in a gas or liquid

- Which type of kinetic friciton has the least friction?
- Fluid

- On a ramp, what force is at an angle?
- The force of gravity (weight)

- On a ramp, how does one find the angle to calculate the components of the force of gravity?
- Subtract the given angle from 90 degrees.

- Explain the relationship between mass and weight.
- They are directly related. Weight is the mass of an object times the acceleration rate of gravity.

- An object is at rest on a tabletop. If the tabletop is tilted slightly, does the normal force decrease or increase? What about the force of static friction? Explain.
- Both decrease. They are directly related.

- Why does pushing downward on a book as you push it across a table increase the force of friction between the table and the book?
- You increase the normal force which is directly related with friction.

- A sky diver falls through air. As the speed of the diver increases, what happens to his acceleration?
- Stays the same. Gravity is acting the same.

- What formula do you use when you have no acceleration?
- Äx=1/2(vi+vf)t

- What formula do you use when you have no final velocity?
- x=vit+1/2at2

- What formula do you use when you have no displacement?
- vf=vi+at

- What formula do you use when you have no time?
- vf©ü=vi©ü+2a¥Äx