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1 - D Kinematics
2 - Kinematics
100
Inertia depends on this quantity
What is mass
100
acceleration is inversely proportional to this quantity
mass
100
Give an example of a reaction force.
Normal Force / Tension....
100
Definition of acceleration
The change in velocity over the change in time
100
The acceleration (and direction) of any object in projectile motion
-g
200
What force does a 10kg object moving at a constant speed need to stay in motion?
0 Newtons
200
Explain the following situation. You are trying to move your grandmothers piano. It takes all your energy to get it to start moving. Once the piano is moving you feel like it is easier to push.
Kinetic friction is less than static friction
200
If you pull on a sled with a force of 20N, the reaction force is 20N in the opposite direction. Explain how the sled is able to move.
Forces are on different objects!
200
A x vs t graph with a curve
Motion with acceleration
200
The X and Y components of a velocity of 18m/s at an angle of 50 degrees
y = 14 ; x = 12
300
Inertia resists this.
Acceleration
300
True or False: An object is on an incline and attached to a dangling mass by string and pulley. The acceleration of the system will always be in the direction the bigger mass wants to move.
False
300
You are in an elevator that is going down. Your normal force compared the normal force at rest is...
Less than
300
The area of v vs. t graph
Displacement
300
A projectile is shot at an angle of 20 degrees. What angle does the same projectile need to be shot at to have the same range?
70 degrees
400
Explain why seat belts in a car are necessary
Without seat belts, your body will want to continue moving with the same velocity. This will become a problem while the car is slowing down.
400
Three blocks of different masses (m1, m2, m3) are attached by a strings of negligible mass. The end of one block is pulled with a force of (F). What is the acceleration of the system?
a = (F) / (m1 + m2 + m3)
400
Draw a force diagram of the following situation
Mr F. is right!
400
The difference between average velocity and instantaneous velocity
Avg. is total distance over total time. Inst. velocity is at one moment in time.
400
How does the range of a projectile (with same v0 and theta) change on the moon where the gravity is 1/6 of earth?
6 times further
500
You are sitting in a car that is starts to go around a small right curve. Explain the motion of your body.
Your body resists a change in motion. It looks like your body moves to the left. In reality your body is moving straight, and the whole car is moving right.
500
What is the tension in string A of the following diagram...
T = 87N
500
What force must you push on a 2kg book against a vertical wall if the coefficient of friction is 0.4?
50N
500
A rocket travels 2.5km at a constant acceleration of 20m/s. It then cuts off its engines. Assuming gravity is constant the whole time, what is the maximum height reached by the rocket?
7.6km
500
A boat is trying to cross a river that flows with a current of -5 m/s. What direction and speed should the boat move so the resultant velocity is 10m/s perpendicular (straight across the river) to rivers motion?
V = 11.1 m/s theta = 63 degrees above the positive x axis