Vocabulary
An object that the only force acting upon it is gravity.
What is a projectile?
What forces act upon a projectile?
What is gravity?
What is the period of circular motion?
What is the time to make one revolution or cycle?
What does universal mean?
It acts across the universe.
Is gravity ever repulsive (pushes away)?
no. it is always attractive.
The velocity an object has at time = 0.
What is initial velocity?
What is the acceleration of a projectile on earth?
9.8 m/s/s down
What does centripetal mean?
What is center-seeking?
What does "G" mean in Newton's Law of Universal Gravitation?
What is the relative strength of gravity?
Is di-hydrogen oxide bad for you?
No. Its water?
The movement of an object at a constant speed around a circle.
What is uniform circular motion?
A rock leaves a ledge flying horizontally at 15 m/s in the horizontal. The cliff is 5 feet tall. How fast is the rock traveling in the horizontal when it hits the ground?
What is 15 m/s?
A car is turning into a left turn. What force causes the objects on the car to slide to the right in the car?
No force. It is inertia.
The radius (distance between two objects) tripled. The force of gravity will be _____ the original force.
What is 1/9
If an object is not moving, the forces on that object must be ____________.
balances, add to zero
The change in velocity over time of an object in uniform circular motion.
What is centripetal acceleration?
An object is launched horizontally. It is in the air 10 seconds. What is is the final velocity of the object when it strikes the ground?
What is 98 m/s?
What is the centripetal acceleration of a car traveling at 10 m/s around a corner with a radius of 25 m?
What is 4 m/s?
There are two masses. One has a mass of 1m and the other is 2m. Which mass will exert a stronger gravitational pull on the other?
What is the same force.
Is the earth a sphere?
not really, it is a sphereoid.
Describe an example of a centripetal force.
(student gives appropriate response)
A cannon ball is launched horizontally with a velocity of 75 m/s. The cannon ball lands 50 m from the base. What is the time it takes for the ball to strike the ground?
What 1/3 or 0.67 seconds?
This is the force of tension in a 0.60m string that twirls a 40.0 g stone horizontally at a speed of 2.2 m/s.
What is 0.32 N?
A mass of 2 kg is paced 1 meter apart from a mass of 1 kg. What is the force of gravity between the two objects?
What is 13.4x10^-11 Newtons?
The normal force is zero.