Speed vs Velocity
This thing tells you how fast you're going, but not which way. what is it?
what does the slope of a positon-time graph represent?
speed or velocity
what is the basic definition of acceleration?
the rate at which velocity changes
what two factors determine an object's momentum?
mass and velocity
a car speeds up to pass a truck, is the car accelerating?
Which one cares about direction: speed or velocity?
velocity.
On a position-time graph, what does a horizontal line segment represent?
the object is at rest
what are the units commonly used to measure acceleration?
meters per second squared(m/s2)
if two objects have the same velocity, but object A has twice the mass of object B, which object has more momentum?
object A
ur waiting for a bus. the bus approaches, slows down, and stops. describe the bus's acceleration
the bus has negative acceleration
If ur driving 60km/h north, and when you turn around you drive 60km/h south, whats changed: ur speed or velocity?
velocity.
if a position-time graph shows a curves line getting steeper, what does that tell you about the object's motion?
the object is speeding up(accelerating)
a roller coaster is moving at a constant speed down a hill. is it accelerating?
a bowling ball rolls down a lane and hits the pins. describe what happens to the momentum of the ball and the pins during the collision
the bowling ball loses momentum, and the pins gain momentum
A skydiver jumps out of a plane. describe what happens to their velocity and acceleration as they fall before they open their parachute
their velocity increases downwards, while their acceleration remains constant downwards
A car travels 160km east in 2 hours, then 80k west in 1 hour. what is its average velocity for the entire trip?
32km/h east
describe the motion represented by a position-time graph that is a straight line sloping downwards
a car accelerates from 0 m/s to 20 m/s in 5 seconds. what is it acceleration?
4 m/s2
True or false: two objects with different masses can have the same momentum if their velocities are different
true
this principle of physics explains why ur less likely to be seriously injured if you fall onto a matress than concrete
impulse
A plane flies in a circular path with a constant speed of 480 km/h. after one complete circle, what is its average velocity?
0 km/h
Object A's position-time graph is a curve that slopes upward, getting steeper over time. object B's position-time graph is a straight line sloping upwards. which object has a greater velocity at the end of the time interval shown
object A
a cyclist increases their speed from 10km/h to 0km/h over a 5 seconds. what is their average acceleration?
2 km/h
if a 0.5 kg ball is rolling at 2 m/s and its momentum is halved, what is its new velocity?
1 m/s
why does a firefighter need to brace themselves when using a high-pressure fire hose?
the high velocity of the water creates significant momentum in the forward direction