VELOCITY
The vector quantity that combines speed with a direction.
What is velocity?
This is the formula for acceleration.
What is a = Δv ÷ Δt (change in velocity ÷ change in time)?
What a flat line at zero on a velocity-time graph, like this one, means about the object.
What is 'the object is stopped'?
This is the formula for momentum.
What is p = m × v?
This type of collision is the one where objects stick together or deform, and kinetic energy is NOT conserved.
What is an inelastic collision?
A car travels 150 meters in 10 seconds in a straight line — this is its velocity.
What is 15 m/s?
A skateboarder speeds up from 2 m/s to 10 m/s in 4 seconds — this is the acceleration.
What is 2 m/s²?
Compared to Object B's line, this is what Object A's steeper line tells you about its speed.
What is 'Object A is moving faster'?
An 8 kg object moves at 5 m/s — this is its momentum.
What is 40 kg·m/s?
This quantity is always conserved in a collision, whether it's elastic or inelastic.
What is momentum?
A runner jogs 40 m east in 8 seconds, then stops — this is the runner's average velocity for the whole 8 seconds.
What is 5 m/s east?
A car slows from 20 m/s to 5 m/s in 5 seconds — this is the acceleration, sign included.
What is −3 m/s²?
On this velocity-time graph showing Maya and Liam walking, this is what the point where their two lines cross represents.
What is 'the moment they are walking at the same speed'?
A 500 g ball moves at 12 m/s — this is its momentum in kg·m/s.
What is 6 kg·m/s?
A 2 kg cart moving at 6 m/s collides with a stationary 4 kg cart and they stick together — this is their combined velocity.
What is 2 m/s?
Car A travels 100 m in 5 s. Car B travels 180 m in 8 s. This car has the greater velocity.
What is Car B — 22.5 m/s, compared to Car A's 20 m/s?
An object has zero acceleration for 6 seconds — this is true about its velocity during that time.
What is 'it stays constant — not necessarily zero, just unchanging'?
On this velocity-time graph, this is the acceleration during the flat section from 4 to 6 seconds.
What is 0 m/s²?
An object has a momentum of 60 kg·m/s and a mass of 15 kg — this is its velocity.
What is 4 m/s?
Two identical 1 kg balls collide head-on — Ball A at 5 m/s, Ball B at −3 m/s — after the collision Ball B is at 5 m/s. The following will be the collision of Ball A after the collision.
What is -3 m/s? (conservation of momentum, suggest that in this case they swapped velocities)
A cyclist travels 24 km east in 2 hours, then turns around and travels 8 km west in 1 hour — this is the cyclist's average velocity for the ENTIRE trip.
What is about 5.3 km/h east (16 km net displacement ÷ 3 hours)?
A rocket accelerates from rest to 60 m/s in 3 seconds. This is its acceleration — and this is what would happen to that acceleration if it took 6 seconds instead to reach the same speed.
What is 20 m/s², cut in half to 10 m/s²?
On this distance-time graph, this describes the hiker's motion across all three sections, comparing speeds.
What is 'moving at a steady pace, then stopped, then moving again but slower than before'?
A velocity-time graph shows a 40 kg object moving at 6 m/s at t = 3 s — this is its momentum at that time.
What is 240 kg·m/s?
A 1,500 kg car moving at 10 m/s crashes into a stationary 1,000 kg car and they lock together — this is their combined velocity.
What is 6 m/s?