Electricity and Magnetism
Electric and EMS
Energy
Distance, displacement, and more
Forces and Motion
100
Why are metals good conductors of electricity?
a. They are malleable and shiny
b. They already have moving electrons
c. They can be stretched into a wire
d. Because they can conduct heat
b. They already have moving electrons
100
Which of the following has the highest energy wave
a. gamma waves
b. ultraviolet waves
c. radio waves
d. microwaves
Gamma
100
If you drop a rock off a cliff, what happens to potential and kinetic energy?
Potential energy decreases; kinetic energy increases
100
Students on the cross-country team begin their race at the school, run a 10 mile loop, and finish back at the school. What is the team’s distance?
10 miles
100
When you are resting in a chair, the chair exerts a(n) ______ upwards to balance the downward gravitational force on you
Normal
200
The force or push that causes electric charges to move in a circuit is called ______________
Voltage
200
Find the frequency of a wave that has a wavelength of 5.62 x 10-7 meters
5.33 x 1014
200
Describe the following energy transformation
Green plants use the sunlight to make glucose during photosynthesis. (Use more specific terms than potential energy)
radiant or light energy to stored chemical energy
200
Students on the cross-country team begin their race at the school, run a 10 mile loop, and finish back at the school. What is the team’s displacement?
Zero
200
When the forces acting on an object are unbalanced, the object will
a. stop
b move at a constant speed
c. accelerate
C accelerate--unbalanced forces would cause an object's speed and or direction to change
300
The two pictures show particles that repel each other. How much stronger is the force of repulsion on the right?
THREE times stronger
300
Which end is the north pole of the magnet?
Red
300
The law of ____ states that energy in a system can change forms but can never be created or destroyed
Conservation of energy
300
Acceleration involves a change in
a. speed
b. direction
c. time
d. both a and b
D. Speed and/or direction
300
A rocket engine pushes hot exhaust gases downward while the gases push the rocket upward. This is an example best described by which of Newton's Laws?
Third
400
The two objects on the left repel each other with a force of F. What is the force of repulsion of the objects on the right?
The force on the right is 1/4 the force on the left
400
Label the charge of the particles below as either positive or negative
Both are positive
400
What is the potential energy of a 55 kg box that is sitting 8.0 m above the ground?
55 x 9.8 x 8.0= 4312 Joules
400
The difference between speed and velocity is _____
Velocity has direction
400
. Pushing a child on a swing is easier than pushing an adult on the same swing, because the adult has more mass. This is an example best described by which of Newton's Laws?
Second: Force = mass x acceleration. You would need more force to put the larger mass
500
Which won't induce voltage in a coil of wire?
a. Hold it near a stationary magnet
b. Place it within a moving magnet casing
c. Rub it, creating friction
A
500
Fine the energy of a photon with a wavelength of 7.2 x 10-7 meters
2.76 x 10 -19 J
500
An object has a velocity of 9 m/s and a mass of 20 kg. What is the object's kinetic energy?
1/2 m x v2 --> 1/2(20) x 92
810 Joules
500
In an inelastic collision, what is conserved?
Momentum
500
An object with a mass of 6 kg has a force of 23 newtons applied to it. What is the resulting acceleration of the object?
F = 23 N
M= 6 kg
F=ma--> 23=6a --> a = 3.8 m/s2