Vocab
the motion of an object along a circular path at a constant speed
uniform circular motion
The equation for centripetal force in terms of mass, velocity, and radius.
What is Fc=mv2/r
In uniform circular motion, this changes continuously even though speed remains constant
velocity- direction
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
This is the inward-directed force required to keep an object moving in a circle.
centripetal force
If velocity doubles while radius stays constant, centripetal force changes by this factor
4x greater
If the centripetal force suddenly disappears, an object will move in this type of path
straight- tangent
This force provides centripetal force for planets orbiting the Sun
gravity
A 4 kg object moves in a circle of radius 2 m at 2 m/s. The centripetal acceleration is this.
2 m/s2
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 centripetal acceleration is always directed toward this.
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.
Ac= V2/r
Increasing mass while keeping speed and radius constant will have this effect on centripetal force
increase proportionally
Roller coaster loops are designed carefully to ensure riders maintain contact with their seats due to this force.
centripetal force, normal/gravity
A 5 kg object moving at 10 m/s in a 5 m radius circle experiences this centripetal force.
100 N
This quantity measures how many complete revolutions occur per second.
frequency
This variable is squared in both centripetal force and centripetal acceleration equations, making it the most influential factor.
velocity
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.
Why does a baseball player move their glove backward when catching a ball?
When a baseball player moves their glove backward while catching a fast pitch, they increase the time of the collision, reducing the force needed to stop the ball while changing its momentum to zero.
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