Universal Gravitation
What is the equation to find gravitational force?
Fg=(G*m1*m2)/r2
This is the unit for mass.
The unit for mass is kg
The acceleration in a circular motion that is perpendicular to the centripetal acceleration.
Tangential acceleration
This is the period of a tennis ball that revolves 5 times in 20 sec.
T= 4
Period (T) The time, in seconds, it takes for one revolution.
How many fundamental forces are there?
There are 4 fundamental forces in the universe.
Gravitational
Electromagnetism
The weak interaction
The strong interaction
The distance between two objects is measured from this to this.
From center to center.
This is the unit for speed or velocity.
The unit for velocity is m/s
The centripetal acceleration points in this direction.
The centripetal acceleration points towards the center.
This is the velocity of a carousel with a 2 m radius and takes 12 sec to complete 2 revolutions.
2 m/s
v=(4*3.14)/6
If a vehicle is driving in a circular motion, on earth, what is the minimum amount of forces acting on the car
3
Friction
Gravity
Normal force
What is does G represent?
G is a physical constant
This is the unit for radius.
The unit for radius is r
The centripetal force points in this direction.
The centripetal force points towards the center.
This is the acceleration of a ceiling fan that has a radius of 5 m and a speed of 10 m/s.
20 m/s2
100/5=20
What is the weakest fundamental force?
Gravitational force is the weakest fundamental force.
What is the acceleration due to gravity?
The acceleration due to gravity is 9.8 m/s2
This is the unit for acceleration.
The unit for acceleration is m/s2
Give the definition for circular motion.
Circular motion is the movement of an object along a certain path caused by a centripetal force and an initial velocity.
This is the force of a 900 kg car that makes a circle with a radius of 25 m at 10 m/s.
3600N
Is centrifugal force a real force?
No, centrifugal force is not an actual force.
Mass and gravitational force are this.
Mass and gravitational force are directly proportional.
This is the unit for force.
N is the unit for force
On a merry-go-round, there is an outer lane and an inner lane. Which lane is moving faster?
The outer lane is moving faster to cover the ground needed to have the same period as the inner lane.
This is the gravitational force between a 100 kg football player and Earth (m=6E24 kg) if he is on the surface of Earth (6.38E6 m).
980 N
What is some times referenced as Newton's fourth law?
The universal Law of Gravitation is sometimes referred to as Newton's fourth law.