100 True/False questions

Weigh → how heavy something is

What is friction? →  a force that acts to resist motion of object, or material of contact

What is the normal force of an object in free fall. →  J Joules

Velocity → speed in a given direction

What does weight really measure? →  amount of gravity

What is the difference between mass and weight? Which one changes with location? Which one remains the same no matter what? →  static, non moving, the object it still
 kinetic, moving 
Resultant → Describing with a single nimber
gives magnitude only
can be both positive and negative 
In the vertical direction, is a projectile moving at a constant velocity or acceleration? Why? →  constant acceleration

If a ball has momentum, it must also have what type of energy? →  vector

Displacement → distance and direction of an object's change in position from the starting point

Precise → how replicable a measurement is; AKA How close to the same number each measurement is

Speed → the amount of matter in an object

Projectile Motion → the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth

Name 3 actionreaction pairs? → the force that opposes the movement of two surfaces that are in contact and are sliding over each other

Which type of collision does not have conservation of mechanical energy? What happens to that energy then? →  elastic
inelastic 
As an elevator accelerates up to the top floor?, what happens to your actual weight? What about your apparent weigh? →  it gets bigger apparent, same actual

Why does your body want to keep going forward after an accident when the can has already stopped? →  0

Will you weigh more or less in an elevator moving at a constant speed up? →  the smae

Hypothesis → how replicable a measurement is; AKA How close to the same number each measurement is

Why is acceleration due to gravity always negative? →  it is pushing down

What is an object's net force when it is equilibrium? →  0

What are the SI units for displacement, mass, time, velocity, acceleration, force, energy, momentum, and impulse? → displacement: meter: m
Mass: Kilogram: Kg
Time: Seconds: s
velocity: meters per sec: m/s
acceleration: meters per sec squared: m/s2
Force: Newtons: N
Energy: Joule: J
Momentum: kg * m/s
Impulse: N*s 
How can an object moving and still have inertia? → . when moving it will stay moving

Elastic Potential Energy → energy stored by something that can stretch or compress

What is impulse? → product of force and time interval during which the force acts.
 Impulse does NOT change in a collision; impulse is the change in momentum 
Force → A push or pull exerted on an object

Momentum → the product of mass and velocity
 inertia in motion 
List Newton's three laws of motion in YOUR OWN WORDS and gives examples of each. → 1. inertia, an object that moves will keep moving, and object at rest will not move, unless another force acts on it
 a ball rolling across a frozen pond, it dose not slow down
2. F=ma, acceleration and mass are directly proportional to force
3. for every action there is an equal opposite reaction 
Is a fact objective of subjective? Is it usually quantitative or qualitative? → Fact Objective
 quantitative 
Explain conservation of momentum in your own words. →  momentum stays the same though a system, same in the beginning and end, unless outside forces

If a bullet is fired horizontally and another is dropped from the same height, which bullet will hit the ground first? →  kinetic

When the mass is increased, what happens to inertia? →  it increases, directly proportional

Theory → an explanation of why things happen that is tested, but is constantly undergoing change; a synthesis of a large body of information that encompasses welltested and verified hypotheses; not set and can undergo change

What is kinetic energy? → energy in motion

Kinetic Energy → energy of motion

Gibe 3 examples of projectiles? →  acceleration

What is the unit of energy? →  J Joules

Fact → an objective observation that cannot be contradicted; a close agreement between competent observations who make a series of observations of the same phenomenon

What are the 5 steps to the scientific method? → 1. Question/ Recognize the Problem
2. Hypothesis
3. Predict consequences of hypothesis
4. Conduct experiment and collect data
5. Conclusion 
What is the coefficient of friction? What are it's units? Is the coefficient of static and kinetic friction always bigger between two objects? Why? →  mu
 no units
 static 
Inelastic Collision → When colliding objects become entangled or coupled together, thereby generating heat or disfigurement
 Energy is lost during the collision (usually due to heat or friction); there is a change in shape 
The force influenced by gravity is called what? →  weight

Does a stretched out slinky on a table have gravitational or elastic potential energy? → elastic the potential to be snap back
gravitational potential energy has potential to fall 
A 5 kg cart moves with a velocity of 4 m/s to the left. What is the momentum of the cart? →  p=20

When an object moves in a circle, in which direction does the force point? What is the name of that force? →  out, centripetal force

Acceleration → an increase in speed

If an object is moving with a constant velocity, what is the net force acting on it? →  a ball rolling acros a frozen pond

Give an example of something with no net force acting on it but still moving? →  a ball rolling acros a frozen pond

If a car is traveling 30 mph needs 100 meters to stop, how much room does it need if it going at 60 mph? How about a 90 mph? → 60 400
90 1600 
Vector → Describing with a single nimber
gives magnitude only
can be both positive and negative 
Know how to convert to SI units (metric conversions). → G*MKHDDCM*ū*N

What is projectile motion? →  a force that acts to resist motion of object, or material of contact

Compare elastic and inelastic collisions. → When colliding objects become entangled or coupled together, thereby generating heat or disfigurement
 Energy is lost during the collision (usually due to heat or friction); there is a change in shape 
Describe the energy transformations as a pendulum swings back and forth. →  Ug to K

Which will have a bigger coefficient of friction, rubber on a dry concreate or rubber on wet concreate? →  0

What are 2 ways an object can have positive constant acceleration? What are 2 ways an object can have negative constant acceleration? → . when moving it will stay moving

In the horizontal direction, is a projectile moving at a constant velocity or acceleration? Why? →  constant velocity

What is the difference between apparent weigh and actual weight? What does a scale tell you? →  0

As an elevator moves with a constant velocity down towards the bottom floor, what happens to your actual weight?
What about your apparent weigh? →  out, centripetal force 
Dimension → a mesurable extent of some kind

What type of force is air resistance? →  acceleration

Kinetic Friction → the force that opposes the movement of two surfaces that are in contact and are sliding over each other

If you are in space (frictionless) and you throw an object that is less massive than you, which will move away faster, you or the object? What if the object is more massive than you? What if the object is the same mass as you? →  the object
 you
 both the same 
Static Friction →  a force that acts to resist motion of object, or material of contact

When you increase the mass of an object but apply the same amount of force, what happens to the acceleration? →  the acceleration goes down

How does bouncing increase the impulse? →  amount of gravity

What is the difference between static and kinetic friction? →  static, non moving, the object it still
 kinetic, moving 
Elastic Collision → When colliding objects become entangled or coupled together, thereby generating heat or disfigurement
 Energy is lost during the collision (usually due to heat or friction); there is a change in shape 
Inertia → the product of mass and velocity
 inertia in motion 
What is the difference between elastic and gravitational potential energy? → Potential energy that depends on the height of an object

What is a force? →  a push or a pull

If a rock in a slingshot has 700 J of potential energy, what type of potential energy is it? How much kinetic energy will the slingshot have after it is fired without air resistance? With air resistance? →  elastic
700 J
 less than 700 J 
What is the name of the force that results from a surface pushing back on an object? →  0

Gravitational Potential Energy → Potential energy that depends on the height of an object

How are impulse and momentum related? →  impulse is change in momentum

What do you bend your knees when you land? →  to increase time, and decrease force

Why would you not require a seat belt to remain in your seat during a loopdeloop on a roller coaster? →  less acceleration, less speed
 acceleration decreases, less speed 
If a truck and a car collide together, which has a bigger force? What has the bigger acceleration? →  kinetic

Impulse → product of force and time interval during which the force acts.
 Impulse does NOT change in a collision; impulse is the change in momentum 
Mechanical Energy → the total energy

Accurate → speed in a given direction

What do forces produce? → energy in motion

What is your weight in the middle of the earth? →  J Joules

Give an example of when something is accurate, but not precise? → when you hit the target in different places

If you fell through the center of earth what happens to your speed as you approach the Earth's center? What about as you move away? →  it gets bigger apparent, same actual

Is momentum a scalar or a vector quantity? →  vector

Mass → A push or pull exerted on an object

What is a free body diagram and what is it used for? →  a drawing with all forces, to show all fouces acting on it

Scalar → Describing with a single nimber
gives magnitude only
can be both positive and negative 
Net Force → the combination of all forces acting on an object

When would the momentum of a system not be conserved? →  when energy is lost, due to outside forces acting on it, work is done

What type of collision takes place with the Newton's Cradle? What type of collision takes place with car crashes? →  inelastic
 it is lost to heat, energy 
What forces are shown on a free body diagram? →  all fouces, tention, norma, applied, friction, cintripial, weight

What is inertia? Is inertia a force? →  a push or a pull

What are 3 ways and object can change it's velocity. →  impulse is change in momentum

What is the difference between distance and displacement? Which is a scalar and which is a vector? → Distance the total distance traveled
Displacement the shortest distance from point a to pint b? 
Can you have constant velocity and constant acceleration at the same time? Why or why not? → 1. speeding up
2. slowing down in the negative direction
1. slowing down
2. speeding up in positive acceloration 
Will you weigh more or less in an elevator accelerating up? →  more

Compare the momentum of a large truck moving 30 mph to the momentum of the same truck moving at 90 mph. →  0 N

Scientific Method → 1. Question/ Recognize the Problem
2. Hypothesis
3. Predict consequences of hypothesis
4. Conduct experiment and collect data
5. Conclusion