1 FORCES + MOTION Flashcards
Unit for mass
Kilogram (kg)
Unit for distance
Metre (m)
Unit for speed
Metre/second (m/s)
Unit for acceleration
Metre/second (^2)
Unit for force
Newton (N)
Unit for time
Second (s)
Unit for gravitational field strength
Newton/kilogram (N/Kg)
Unit for moment
Newton metre (Nm)
Unit for momentum
Kilogram metre/second (Kg m/s)
Speed equation
Average speed = Distance moved / Time taken
What does the gradient represent on a distance-time graph
Speed
What is a sharp diagonal line on a distance-time graph
Constant speed
What is a flat line on a distance-time graph
Stationary
How to investigate motion with a ramp
- Measure distance of ramp with ruler
- Time from let go to down ramp with stopwatch reset at zero
- s=d/t
- Repeat and average
How to investigate motion with a ticker timer
*Attach tape to back of object and into timer
* Far apart dots = more distance per unit time
How to investigate motion with light gates
- Requires an interupter card to break beam
- S = d/t
Acceleration equation
Acceleration = change in velocity / time
Acceleration symbol equation
a = (v-u) / t
Speed symbol equation
S = d / t
What is the gradient on a velocity-time graph
Acceleration
What does a non-straight increasing line represent on a velocity-time graph
Increasing acceleration
What does a steady sloped line show on a velocity-time graph
Constant accelration/deceleration
How do you calculate the distance from a velocity-time graph
The area underneath the graph
What can forces do to objects
Change their shape, speed and direction
On a free-body diagram, what does the size of the arrow represent
The force
What does friction do to motion
Oppose it
Correlation between friction and motion
Friction opposes motion
How do you calculate the resultant force on a free body diagram
The unbalanced force