Which two quantities stays the same during projectile motion?
Gravity and Horizontal Velocity
100
The greater a body's inertia, the ______ it is to change its velocity.
Harder
100
What is the equation for centripetal force?
F=(m*v^2)/r
100
What is the force that opposes motion and what is the equation to solve for it?
Frictional Force.
Frictional force = coefficient of friction * Normal force
200
A book is sitting on a table. The force of gravity is pulling it downward. What is the reaction force to the book pushing down on the table? What is this force called?
The table pushing up on the book. Normal Force.
200
When an object has a constant velocity what is the slope on a velocity versus time graph?
A zero slope.
200
What is a turning or twisting force; the measure of a force's tendency to produce twisting or turning and rotation around an axis
Torque
200
What direction does the acceleration point during uniform circular motion?
Towards the center.
200
If you were to throw a rock 4.3 m/s, horizontally, and drop another from the same height, which would hit the ground first?
Both will hit at the same time.
300
When forces act in opposite directions you do what?
When forces act in the same direction?
Subtract. Add.
300
A car is traveling with a velocity of 7.7 m/s and accelerates uniformly at a rate of 0.88 m/s2 for a distance of 357 m. What is the car's velocity at the end of the acceleration?
26 m/s
300
A torque is applied to a fidget spinner that was spinning at 20 rot/sec. It spins up to 80 rot/sec over the course of 10 seconds. What was the angular acceleration of the spinner?
6 rots/s^2
300
Two objects exert a gravitational force on each other. Both objects double their masses. What is the force of attraction between them now?
4 times as much.
300
What is an example of a vector quantity and a scalar quantity?
Answers vary.
400
Which forces acting on an object result in a net force and cause a change in the object's motion?
Unbalanced Forces.
400
A robot probe drops a camera off the edge of a 225 m high cliff on Jupiter where the acceleration due to gravity is -24.5 m/s2. What is the velocity with which the camera hits the ground? How long does it take for the camera to hit the ground?
vf = 105 m/s
t = 4.29 s
400
Will a disk or a ring roll win when racing down a ramp?
Why?
Disk
400
The acceleration of an object with a velocity of 11.5 m/s and a radius of 3.0 m.
44 m/s^2
400
An elevator repairman is working in an empty elevator shaft at the 100th floor of the Empire State Building. He accidentally drops a screwdriver. If it takes 9.2 seconds for the screwdriver to hit the ground, how high up is the elevator repairman?
423m
500
What is the combination of all forces acting on an object at one time?
Net Force.
500
In what direction is all of the velocity at the top of a projectile's peak?
Horizontal Direction
500
A frisbee with a radius of 0.1m is rotating at 4 rev/sec when a 100N force is applied by a hand tangent to its edge. The frisbee has a moment of inertia of 15 kg/m2. If this force is applied for 3 seconds, what will be rotational velocity of the frisbee after it is released?
6 rev/s
500
Two objects exert a gravitational force on each other. One of the objects double their masses. The distance between them is halved. What is the new force between them?
8 times the force.
500
A big rock is shot upward at an angle of 30 degrees. What distance is the rock shot if it is shot at 8m/s?