Physics-Intro Flashcards
(32 cards)
The Study of Physics
Study of matter, motion through space and time, and how it relates to energy and force. It’s a fundamental science; it’s trying to find out how the universe behaves.
Define motion
Moving or being moved, traveling in any direction
How do you know if there’s motion? How is it measured?
It will be traveling/moving. Measured by speed. S=D/T
Speed
Rate at which an object moves
Mph, m/s
Speed=distance/time
Velocity
Speed in a particular direction
M/s north, etc.
Velocity=distance/time
Acceleration
Rate at which velocity/speed changes
M/s/s, m/s^2
Acceleration=speed/time
(The object can go from 0m/s to 10m/s in 10 seconds.)
Force
A force is a push or pull that changes an object’s shape, motion, pressure, or direction.
Balanced force
When forces are balanced, the object’s motion is constant.
A plane flying at a constant rate; a book sitting on a desk
Unbalanced force
Unbalanced forces cause an object to change its motion, direction, etc.
A car speeding up,a baseball gaining and losing height/speed
Friction
Friction is a force that opposes the motion of objects that touch as they move past each other.
A piece of furniture being pushed on the carpet.
Four types of friction (in order of strength)
- Static friction
- Sliding friction
- Rolling friction
- Fluid friction
Static friction
This acts on objects that aren’t moving, in the opposite direction of the force.
Static friction between shoe and floor keeps the shoe from sliding.
Sliding friction
This opposes the direction of motion when something slides over a surface. It’s easier to keep something moving than to start its movement because sliding friction is less than static.
Pushing a book across a table
Rolling friction
When a round object rolls on a flat surface, they both bend slightly out of shape at the point of contact. This is rolling friction.
This type is 100 to 1000 times less than static or sliding.
I drop a spherical bead on the hardwood floor, and it rolls away.
Fluid friction
This opposes the motion of an object through a fluid. When speed increases, fluid friction increases. Air resistance is one type of fluid friction.
When I push of fast from the side of the pool and shoot forward underwater
Force 2
A force is a push or pull
Forces may or may not cause movement
Balanced forces 2
Two forces equal in size and acting in opposite directions on an object
The object stays still or continues to move at the same speed and in the same direction
Unbalanced forces 2
Two forces that are unequal in size and acting in opposite directions
Cause an object to change position, direction, or speed
Net force
The overall, total force acting on an object
Measured in (N) Newtons
The sum of all of the forces, added up as vector quantities
25 N➡️❤️25 N➡️
50 N right
18N➡️❤️⬅️25N
7N left
14N ⬇️ ❤️ 36N ⬇️
50N down
Inertia
Resistance to an object’s change in position
Newton’s First Law of Motion
An object at rest will stay at rest, and an object in motion will stay in motion unless acted upon by an external force.
Could also be named “The Law of Inertia”
