Science Review Jan.
Terms
undefined, object
copy deck
- Newton's first law is the law of ____
- inertia
- inertia =
- when an object resists change in it's motion
- 2 examples of newton's first law are...
-
1. a car's brakes stopping it
2. a crash test dummy - Newton's First Law=
- an object in motion will stay in motion, and an object at rest will stay at rest, unless opposed by an unbalanced force
- Newton's 3rd law is the law of _______
- action/reaction
- What is newton's 3rd law?
- For every action, there is always an equal and opposite reaction.
- What is newton's 2nd law?
-
Force=Mass x Acceleration
Acceleration=Force/Mass - The net force is .....
- The force equired to accelerate 1 kg of mass at 1 m/s2
- 1 N = 1 kg x 1 _____
- m/s2
- How can you add friction
- increase pressure
- How can you reduce friction?
-
add more contact
add a lubricant - What is friction?
- A force that opposes motion when 2 objects are in contact
- When does friction exist
- When two objects are in contact.
- What are some examples of friction?
- Bowling, ice skating, sitting in a chair, guitar.
- What are two things that friction depends on?
-
1. How uneven the surfaces are (roughness)
2. How hard the surfaces push against each other (pressure) - Define and give examples of the 2 types of friction
-
A. Siliding friction-when one surface slides over the other
B. Rolling friction-when one surface rolls over the other - Why do cars with underinflated tires use more gas?
- When theres more contact, you need more power
- What is fluid friction?
- Contact with a non-solid
- What determins high or low MU factors?
- The amount of friction
- What are lubricants used for?
- To reduce friction