Vocab
What does the word centripetal mean?
center seeking
The equation for centripetal force in terms of mass, velocity, and radius.
What is Fc=mv2/r
In uniform circular motion, ______________ changes continuously while ___________ remains constant
velocity- direction
speed
The force that keeps a car moving in a circular path on a flat road.
friction
A 2 kg mass moves in a circle at 3 m/s with a radius of 1 m. The centripetal force is this.
18 N
explain the relationship between momentum and impulse
impulse is the change in momentum
Why do objects move tangentially when centripetal force is stopped?
inertia
This force provides centripetal force for planets orbiting the Sun
gravity
A 1 kg mass requires 25 N of centripetal force in a circle of radius 5 m. Its speed is this.
11.2 m/s
The quantity of motion of a moving body; how difficult an object is to stop
momentum
If radius doubles while velocity stays constant, centripetal force becomes this fraction of the original.
half
The direction of net force for an object in uniform circular motion?
towards center of circle
In a ball tied to a string and swung in a circle, this force provides centripetal force.
tension
The linear momentum of a runner in a 100 m dash is 750 kg m/s. If the runners speed is 10 m/s, what is his mass?
75kg
This term describes the apparent outward “force” felt in a rotating reference frame.
centrifugal force
This is the equation for centripetal acceleration using Angular velocity
Ac= r(Omega)2
Determine the momentum of an electron (m= 9.1 x10-31 kg) moving at 2.18 x 106 m/s
2 or 1.98x10-24
Which force is acting as the centripetal force on Delgrosso's Round-up ride
normal
A 5 kg object moving at 10 m/s in a 5 m radius circle experiences this centripetal force.
100 N
radians is the ratio of ___________ over ____________
arc length over radius
convert 3.14 radians to degrees
180
Two objects move at the same speed, but one has twice the mass of the other. What will be the difference be in their momentum?
Object with twice the mass will have twice the momentum.
What safety feature has been added to cars since we learned about collisions and why?
cars crumble to lesson force by increasing contact time
A bicycle has a momentum of 24 kg•m/s. What momentum would the bicycle have if it had 3 times the mass and half the speed?
36 kg•m/s