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• ### Scientific Method

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

### Fact

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

### Hypothesis

an educated guess; specific, quantitative/ qualitative, includes time period

### 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 well-tested and verified hypotheses; not set and can undergo change

### Accurate

Nearness of a measurement to the accepted true value

### Precise

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

### Dimension

a mesurable extent of some kind

### Vector

Deals with both magnitude and direction

### Scalar

Describing with a single nimber
gives magnitude only
can be both positive and negative

### Resultant

a vector that is the sum of two or more other vectors
- the final point in the process

### Velocity

speed in a given direction

### Speed

The distance an object travels per unit of time

### Mass

the amount of matter in an object

### Weigh

how heavy something is

### Acceleration

an increase in speed

### Displacement

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

### Projectile Motion

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

### Force

A push or pull exerted on an object

### Net Force

the combination of all forces acting on an object

### Static Friction

friction that acts on objects that are not moving
- resists motion

### Kinetic Friction

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

### Inertia

the tendency of an object to resist any change in its motion
- a law

### Mechanical Energy

the total energy

### Gravitational Potential Energy

Potential energy that depends on the height of an object

### Elastic Potential Energy

energy stored by something that can stretch or compress

### Kinetic Energy

energy of motion

### Momentum

the product of mass and velocity
- inertia in motion

### 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

### Elastic Collision

When objects collide without being permanently deformed or without generating heat
- Energy is NOT lost; there is no damage to either object

### 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

### 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

### 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?

### Know how to convert to SI units (metric conversions).

G*MKHDDCM*ū*N

### 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

### Give an example of when something is accurate, but not precise?

when you hit the target in different places

### Is a fact objective of subjective? Is it usually quantitative or qualitative?

Fact- Objective
- quantitative

### Can you have constant velocity and constant acceleration at the same time? Why or why not?

No, because acceleration is change in velocity
- only when your velocity or acceleration ir both is zero

### What are 3 ways and object can change it's velocity.

- speed up
-slow down
-chance direction

### What are 2 ways an object can have positive constant acceleration? What are 2 ways an object can have negative constant acceleration?

1. speeding up
2. slowing down in the negative direction
1. slowing down
2. speeding up in positive acceloration

### Why is acceleration due to gravity always negative?

- it is pushing down

### What is a force?

- a push or a pull

### What is inertia? Is inertia a force?

- it is a law, the tendency of an object to stay in it's constant state, unless another force acts on it

### When the mass is increased, what happens to inertia?

- it increases, directly proportional

### How can an object moving and still have inertia?

.- when moving it will stay moving

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

- because of inertia

### What do forces produce?

- acceleration

- 0

### Give an example of something with no net force acting on it but still moving?

- a ball rolling acros a frozen pond

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

- the acceleration goes down

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

- out, centripetal force

### Why would you not require a seat belt to remain in your seat during a loop-de-loop on a roller coaster?

- centripital force forces you out towered the tract into your seat

### What is friction?

- a force that acts to resist motion of object, or material of contact

- dry

### What is a free body diagram and what is it used for?

- a drawing with all forces, to show all fouces acting on it

### What forces are shown on a free body diagram?

- all fouces, tention, norma, applied, friction, cintripial, weight

- friction

- weight

- normal

- 0

### 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

- 0

### What is the difference between static and kinetic friction?

- static, non moving, the object it still
- kinetic, moving

- mu
- no units
- static

### Name 3 action-reaction pairs?

-a car pushing on the earth, the earthing pushing back on it
- two people pushing off each other on ice
- a gun shooting out a bullet

### If a truck and a car collide together, which has a bigger force? What has the bigger acceleration?

- same force
- car bigger acceleration

### What is the difference between mass and weight? Which one changes with location? Which one remains the same no matter what?

- mass is amount of matter, reamins the stame
- weigh relative to gravity, pushing down, changes with location

### What is projectile motion?

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

### Gibe 3 examples of projectiles?

- a man being shot out a a cannon
- a gun shooting out into the are
- throwing a ball in the air

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

- same time, because same vertical speed

### In the vertical direction, is a projectile moving at a constant velocity or acceleration? Why?

- constant acceleration

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

- constant velocity

- J Joules

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

- apparent is based on normal weigh at the moment in time and place, scale tells you
- actual weigh is just what you weigh no matter what

### 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

### As an elevator moves with a constant velocity down towards the bottom floor, what happens to your actual weight? What about your apparent weigh?

- actual stays the same
- apparent weigh gets smaller

### What is kinetic energy?

energy in motion

60- 400
90- 1600

### What is the difference between elastic and gravitational potential energy?

elastic- the potential to be snap back
gravitational potential energy- has potential to fall

- both

### If a rock in a sling-shot has 700 J of potential energy, what type of potential energy is it? How much kinetic energy will the sling-shot have after it is fired without air resistance? With air resistance?

- elastic
-700 J
- less than 700 J

- Ug to K

- vector

### 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

### Compare the momentum of a large truck moving 30 mph to the momentum of the same truck moving at 90 mph.

- 90 mph, 3 times grater

### How are impulse and momentum related?

- impulse is change in momentum

### How does bouncing increase the impulse?

- it does not

### What do you bend your knees when you land?

- to increase time, and decrease force

### When would the momentum of a system not be conserved?

- when energy is lost, due to outside forces acting on it, work is done

### 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

- p=-20

### Compare elastic and inelastic collisions.

elastic- no damage or hear, bounce
inelastic - stick together, or warping, energy losy

### Which type of collision does not have conservation of mechanical energy? What happens to that energy then?

- inelastic
- it is lost to heat, energy

- elastic
-inelastic

### Explain conservation of momentum in your own words.

- momentum stays the same though a system, same in the beginning and end, unless outside forces

- kinetic

### 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?

- less acceleration, less speed
- acceleration decreases, less speed

- 0 N

- more

- the smae

### What does weight really measure?

- amount of gravity

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