Motion & Forces
What is the formula for speed?
speed is distance divided by time
What is the unit for electric current?
ampere (A)
What type of energy is stored in a stretched rubber band?
Potential Energy
What kind of wave requires a medium to travel?
A mechanical wave
What is the SI unit for mass?
kg
Which law explains that an object in motion stays in motion unless acted on by an outside force?
Newton's First Law of Motion
What does Ohm’s Law state?
V = IR (Voltage = Current × Resistance)
I am the The ability to do work. What am I?
Energy
What part of a wave is the highest point?
Crest
What is the acceleration due to gravity on Earth?
9.8 m/s²
What law states that for every action, there is an equal and opposite reaction?
Newton's Third Law of Motion
I'm a measure of the opposition to the flow of electric current. What am I?
Resistance
What energy transformation occurs in a toaster?
Electrical to thermal energy
What is the frequency of a wave with a wavelength of 2 m and a speed of 10 m/s?
10/2=5 Hz
Which subatomic particle has a negative charge?
an electron
A 10 kg object accelerates at 2 m/s². What is the net force?
20 N
What is the name of the flow of electrons in an electric circuit?
Current
What is the law of conservation of energy?
energy cannot be created or destroyed, only transformed
What causes the Doppler effect?
the relative motion between the source and the observer
Explain the difference between scalar and vector quantities.
a scalar has only magnitude, and a vector has both magnitude and direction
What kind of force resists motion between two surfaces
What device converts electrical energy into mechanical energy?
An electric motor
Calculate the kinetic energy of a 2 kg object moving at 3 m/s.
9 J
Explain constructive and destructive interference.
constructive adds waves together; destructive cancels them out
What is the difference between nuclear fission and fusion?
Fission splits atoms, fusion combines them.