1A Motion Flashcards
1
Q
Average speed
A
The total distance of a journey divided by the total time
2
Q
Instantaneous speed
A
The speed at one particular moment in time
3
Q
Vector
A
Has a magnitude and a direction
4
Q
Scalar
A
Doesn’t have a direction
5
Q
Distance
A
how far an object has moved in total
6
Q
Displacement
A
how far and in which direction an object is from its initial position
7
Q
Speed
A
the rate of change of distance
8
Q
Velocity
A
the rate of change of displacement
9
Q
Acceleration
A
the rate of change of velocity
10
Q
Forces type
A
- Weight (gravity)
- Static electric force
- Magnetic force
- Thrust
- Friction
- Air resistance (viscous drag)
- Upthrust
- Normal force
11
Q
Thrust
A
Due to engines and objects propelling themselves
12
Q
Upthrust
A
- Acts on objects in fluids
- Equal to weight of displaced fluid
- Usually negligible - unless object density less than surrounding medium
13
Q
Normal or contact force
A
- The force that stops solids moving through each
other - Acts whenever two surfaces are in contact
- Acts perpendicular (90 degrees) to surface
- Stops objects moving through each other
14
Q
Friction
A
- Happens when touching objects move
- Always acts opposite direction to movement
15
Q
Air resistance
A
- Opposes objects moving through fluids
- Depends on shape, but not mass
- Increases with speed
