Kinematics
What does the area under an acceleration-time graph give
Change in velocity
What is the formula for force?
F = ma
Is a compressed spring an example of potential or kinetic energy?
Potential energy
A volleyball, bowling ball, ping pong ball, and a marble are rolling down a slope. The ball with the greatest kinetic energy is
the bowling ball
What is the charge of a balloon if it gains 7.5 x 1010 electrons?
q = Ne
q = (7.5 x 1010)(-1.6x10-19C)
q=-1.2 x 10-8C
A kangaroo is capable of jumping to a height of 2.62m. Determine the takeoff speed of the kangaroo
Vf2 =Vi2 + 2ad
0 = Vi2+ 29-9.8)(2.62)
0 = Vi2 - 51.352
Vi = 7.16m/s
This states that an object in motion stays in motion until an unbalanced force acts upon it.
Newton's First Law of Motion
What is the momentum equation?
p = mv
The formula to find kinetic energy
k = 1/2 mv2
What is the formula for Coulombs Law
F =k(q1q2/r2)
What component of a 2-d kinematic question is constant throughout the entire motion?
Horizontal velocity
An object has a mass of 5 kg, If the object is accelerating at 4m/s2. What is the force the object applies?
F=ma
=5x4
=20N
The formula for power
p = w/t
The formula for gravitational potential energy
Gpe = mgh
what happens to the leaves of a neutral electroscope when it is charged with a negative rod
They repel each other and diverge.
What step determines the amount of sig figs in a given quesiton?
The last step.
If addition, subtraction = decimal points
If multiplication/division = number of digits
If the mass of an object is doubled, what will happen to the force?
The force is doubled too.
You do 2000 J of work in 5 seconds. Your work is
power = w/t
=2000/5
=400W
At what point of the roller coaster is the kinetic energy the highest?
At its lowest point
what is the process called when a charged object is used to charge a neutral one without discharging itself
Charging by induction
A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car.
d=v1t+1/2at2
d=1/2at2
a=2d/t2
a=2(110)/(5.21)2
=8.10m/s^2
If your given the height of the satellite and need to figure out velocity, what must you do?
Add the height from the surface of the planet to the radius of the planet. Ten use:
v = SQRT [ (G•MCentral) / R
What scientific principle states that momentum is conserved?
The law of conservation of momentum
The impulse of a 25 N force applied for 3 seconds
impulse = force x time
= 25 x 3
=75Ns
Two identical point charges q are separated by a distance r, and have an electrical potential energy, EE . Each charge is doubled, and the distance between them reduced by half. What is the electric potential energy?
F =k(q1q2/r2)
E = k[2q1)2(q2)/r2]
E = k(4q2)/r/2
=8k(q2)/r
e = 8 x E
Therfore Electric potential energy is 8EE