Energy
A student applies different forces on an object at rest. In which case is the most work done?
A. 1 N force moves the object through a distance of 1m
B. 5 N force moves the object through a distance of 3m
C. 1 N force moves the object through a distance of 2m
D. 3 N force moves the object through a distance of 6m
D. 3 N force moves the object through a distance of 6 m
A man stands on the sidewalk during a sunny day and shadow is cast on to the ground below him. What term best describes this scenario?
A. Diffraction
B. Refraction
C. Reflection
D. Interference
A. Diffraction
As you pull the sock off the pajamas, you see a spark. What do you think caused this spark?
A. The movement of electrons.
B. The protons repelling each other.
C. The lack of a magnetic field.
D. Your hands touching the clothes.
A. The movement of electrons.
Andre is moving the furniture in his bedroom. By placing wheels under his dresser, Andre makes his task easier by changing —
A. rolling friction to fluid friction
B. sliding friction to fluid friction
C. sliding friction to rolling friction
D. fluid friction to static friction
C. sliding friction to rolling friction
The name of the galaxy that contains the Sun and its components is —
A. Andromeda
B. the Milky Way
C. the Zodiac
D. Perseus
B. the Milky Way
Which of the following is an example of thermal energy transfer from a higher energy system to a lower energy system?
A. Wrapping a hand around an ice cube
B. Pouring hot water into a hot cup
C. Sitting on the kitchen counter is a can of soda at room temperature
D. Placing frozen hamburger in a freezer
A. Wrapping a hand around an ice cube
A pencil is placed in a beaker of water. When viewed from the side, the pencil appears to be bent. This is an example of —
A. attraction
B. refraction
C. reflection
D. diffraction
B. refraction
A student wants to construct a simple electric circuit that lights up a bulb when a current is passed through it. He collects: a lightbulb, a switch, and a battery.
Which additional component would he require to complete the electric circuit?
A. An electric light bulb
B. Two batteries
C. An electric buzzer
D. Some connecting wires
D. Some connecting wires
All of the following are examples of acceleration EXCEPT —
A. changing directions
B. moving in a straight line and at a constant speed
C. speeding up
D. slowing down
B. moving in a straight line and at a constant speed
What best supports the concept of the big bang theory?
A. The planets vary in chemical composition.
B. The galaxies are moving away from each other.
C. The planets can spin on their axes.
D. The universe is composed of galaxies of different shapes and sizes.
B. The galaxies are moving away from each other.
What is the best example of a device that converts electrical energy ⇒ thermal energy?
A. A toaster
B. A flashlight
C. A clock radio
D. An electric toothbrush
A. A toaster
Which electromagnetic wave carries the least energy?
A. Radio waves
B. Ultraviolet rays
C. Visible light
D. Gamma waves
A. Radio waves
Which of these would be a good insulator?
A. Gold
B. Aluminum
C. Water
D. Plastic
D. Plastic
Explain the difference between balanced and unbalanced forces.
Balanced forces: cancel each other out and the object will NOT move.
Unbalanced forces: cause an object TO MOVE in the SAME direction as the STRONGER force.
The gases that are predominant in stars are —
A. carbon and nitrogen
B. hydrogen and helium
C. carbon and methane
D. hydrogen and uranium
B. hydrogen and helium
Which TWO statements correctly differentiate mechanical energy from thermal energy?
A. Mechanical energy is independent of the weight of the moving body while thermal energy is dependent on the weight of the moving body.
B. Mechanical energy is due to the motion of an object while thermal energy is due to the collision of molecules.
C. Mechanical energy is measured at the system level while thermal energy is measured at the molecular level.
D. Mechanical energy is determined by the gravitational pull of Earth while thermal energy is determined by the centripetal force of Earth.
B. Mechanical energy is due to the motion of an object while thermal energy is due to the collision of molecules.
C. Mechanical energy is measured at the system level while thermal energy is measured at the molecular level.
Which electromagnetic wave carries more energy than Infrared, but less energy than Ultraviolet?
A. Gamma Ray
B. Visible Light
C. Microwave
D. Radiowave
B. Visible Light
What are the THREE ways to transfer charges?
1. Conduction
2. Friction
3. Induction
What is the distance and displacement of someone that runs 3 laps around a 400 meter track?
distance = 1200 m
displacement = 0 m
In stellar evolution, it is clear that the last stage in a low mass star is —
A. a black hole
B. a neutron star
C. a black dwarf
D. a white dwarf
C. a black dwarf
Imagine a roller coaster track with three main spots:
Point A: The very top of the first, highest hill (the coaster starts here from a complete stop).
Point B: The absolute lowest point at the bottom of the track (ground level).
Point C: The top of a smaller hill further down the track.
Assume the coaster glides perfectly without any friction or air slowing it down.
1) Where on the track is the potential energy at its LOWEST?
2) Where on the track is the kinetic energy at its LOWEST?
1) A => B
(PE decreases and turns into KE)
At B, PE at lowest, KE at highest.
2) Point A
At A, PE is at its highest, KE is at its lowest.
Give an example of the Doppler Effect happening in real life.
Example:
Ambulance Far Away: Sounds far away with Low Pitch
In Front of You: Sounds Loud with High Pitch
Ambulance Moving Away: Pitch drops again
Which one of these transfers electrons through electric fields over a working distance?
A. Conduction
B. Friction
C. Induction
D. Static
C. Induction
State all THREE of Newton's Laws of Motion.
1st Law: An object in motion will stay in motion/object at rest will stay at rest unless acted upon by a force.
2nd Law: Force = Mass x Acceleration
3rd Law: For every action, there is an equal opposite reaction.
Which process do hydrogen atoms use to make the Sun’s energy?
A. Nuclear fusion
B. Nuclear isotope
C. Nuclear fission
D. Nuclear meltdown
A. Nuclear fusion