Machines
Light/Sound
Waves
Acceleration/Speed
Miscellaneous
100
How does the work done on a machine compare to the work done by a machine?
What is the work done on a machine is less
100
What is the difference between reflection and refraction?
What is refraction bends light and reflection allows light to travel in straight lines.
100
What are three types of mechanical waves?
What is longitudinal, surface, and transverse waves.
100
An Olympic swimmer swims 50 m in 23.1 seconds. What is his average speed? Hint: speed= distance/time
What is 2.16 m/s
100
What is the difference between weight and mass?
What is mass remains constant and weight changes.
200
Why can no machine be 100% efficient?
What is because of friction.
200
Describe transparent, translucent, and opaque materials.
What is transparent is see through, translucent produces a foggy image, and opaque materials is not see through.
200
Draw a transverse wave and label the crest, wavelength, and trough.
What is answers will vary.
200
Draw a graph with a positive acceleration
What is answers will vary
200
Describe why a projectile follows a curved path.
What is because gravity pulls an object downward.
300
What are the 6 simple machines?
What is lever, pulley, screw, wheel and axle, wedge, and inclined plane
300
How does sound travel?
What is by sending vibrations through a solid, liquid, or gas (medium).
300
Predict whether an electromagnetic wave would travel through space if its electric and magnetic fields were not changing with time. Explain your reasoning.
What is no because electromagnetic waves can't exist without electric and magnetic fields changing.
300
A boy pushes forward a cart of groceries with a total mass of 40 kg. What is the acceleration of the cart if the net force on the cart is 60 n? Hint: acceleration=force/mass
What is 1.5 kg/N
300
Two coins are knocked off a table at the same time by different forces. Which coin will hit the floor first?
What is they will fall at the same rate.
400
How much work does a 25 N force do to life a potted plant from the floor to a shelf 1.5 m high? Hint: work=force*distance
What is 37.5 J
400
What is the difference between a concave mirror and a convex mirror?
What is a concave mirror curves inward and a convex mirror curves outward.
400
What is the wavelength of an earthquake wave if it has a frequency speed of 5 km/s and a frequency of 10 Hz?
What is .5 km
400
Give an example of instantaneous speed.
What is answers will vary; speedometer
400
What is the weight of an object with a mass of 112 kg? Weight= mass x acceleration
What is 1097.6 N
500
You carry two heavy bags of groceries upstairs to your kitchen. Will you do more work on the bags if you carry them up one at a time? Explain.
What is it is the same amount of work because when you carry one bag at a time you are using half of the force with double the distance.
500
Explain why a fire engine’s siren sounds lower in pitch after the fire engine passes you?
What is as the siren moves away, each wave front produced by the siren is farther from the previous wave front than if the siren were standing still. The actual frequency does not change but the frequency or pitch heard by the observer is lower.
500
A friend says that all mechanical waves must lose energy as they move through a medium because some energy is lost due to friction. Explain why this is true.
What is the energy of a mechanical wave causes the medium to vibrate. As vibrating particles in the medium collide, most of the energy can be passed on to the next particle, but fluid friction will cause some energy to be converted into thermal energy.
500
How does air resistance affect the acceleration of a falling object?
What is As a falling object accelerates through air, its speed increases and air resistance increases. While gravity pulls the object down, we find that air resistance is trying to limit the object's speed. Air resistance reduces the acceleration of a falling object. It would accelerate faster if it was falling in a vacuum
500
Describe each of Newton's three laws.
What is 1. An object in motion will stay in motion unless a force acts on it. 2. Force=mass x acceleration or F=force/mass. 3. For every action there is an equal and opposite reaction
M
e
n
u