Vocabulary
The change in position of an object is called what
Displacement
Flat horizontal line on a position–time graph means what?
Rest
Formula for average velocity?
v = Δx/Δt
Car at 20 m/s for 10 s. Distance?
200 m
Which equation is used if time is not given?
v² = v₀² + 2aΔx
The rate of change of position is called…
Velocity
On a velocity–time graph, slope represents what?
Acceleration
Equation for displacement with v₀, t, and a?
x = x₀ +v₀t + ½at²
or
x = xi +vit + ½at²
Drop from rest, 2 s, g = 10. Distance?
20 m
At the top of its motion, velocity is?
0 m/s
The rate of change of velocity is called…
Acceleration
On a velocity–time graph, area under curve represents what?
Displacement
Which equation has no time variable?
v² = v₀² + 2aΔx
Sprinter at 4 m/s² from rest. Time to 12 m/s?
3 s
Two objects, different masses, dropped at same height. Who hits first?
Both at same time
Which quantity can be negative: speed or velocity?
Velocity
Straight line sloping upward on position–time graph?
Constant positive velocity
Object at rest, a = 3 m/s², t = 4 s. Final velocity?
12 m/s
Stone up at 15 m/s, g = 10. Time to peak?
1.5 s
Car accelerates 2 m/s² from rest. Time for 100 m?
10 s
Difference between instantaneous velocity and average velocity?
Instantaneous = velocity at a moment; Average = displacement ÷ time
How to tell if object is speeding up or slowing down on velocity–time graph?
Same/opposite signs for velocity & acceleration
Car: v₀ = 10 m/s, v = 30 m/s, t = 5 s. Displacement?
100 m
Car at 25 m/s stops in 5 s. Acceleration & displacement?
–5 m/s²; 62.5 m
A car accelerates uniformly from rest and covers 200 m in 10 seconds
Part A: What is the car’s acceleration?
Part A → a = 4 m/s²