This is the Final for the semester enjoy and easy 100%:)
1.A person uses a screwdriver to turn a screw and insert it into a piece of wood. The person applies a force of 20 newtons to the screwdriver and turns the handle of the screwdriver a total distance of 0.5 meter. How would these numbers be different if the person inserted a nail with a hammer instead of the screw with the screwdriver?
The force applied would be greater, but the distance would be shorter.
2.What do a Class 1 lever and a Class 2 lever have in common?
Both levers result in a larger output force from a smaller input force.
3 What makes this lever effective?
The man is farther from the fulcrum than the rock is.
4 What is the efficiency of a machine that uses 102 kJ of energy to do 98 kJ of work?
96.1%
5 A pulley system is used to lift an object. Which factor could affect the efficiency of the system?
the friction of the individual pulleys
6 Which phrase defines gravitational force?
an attractive force between two objects due to their masses
7 The more matter in an object, the _____.
greater its gravitational attraction to Earth
8 If two balls of different masses are dropped and land at the same time. How will their motions compare?
The two balls have the same acceleration.
9 A soccer ball and bowling ball, with the same areas and different masses, are dropped at the same time. How will their motions compare?
The objects will fall at the same speed because the effect of gravity on them is the same.
10 Based on the mass and speed data, which object will have the greatest amount of kinetic energy?
10 kg moving at 5 m/s
11 Which statement accurately explains why the kinetic energy of the first rider is greater?
The first rider has more mass.
12 A single billiard ball, traveling at 20 m/s, strikes a cluster of 15 balls on a billiard table. What can be said about the balls on the table after the collision?
None of the balls will have a velocity greater than 20 m/s.
13 Where do the forces that make atoms interact come from?
from the electric fields of charged subatomic particles
14 When two charged particles are moving toward each other, their velocities decrease until they eventually come to a stop. What happens afterward?
They accelerate in opposite directions.
15 A bar magnet is held in place while another bar magnet is placed near it. The second bar magnet spins around and attaches to the first magnet on one end. Which statement is correct about the energy stored in the magnetic field?
The decrease in the energy stored in the system is proportional to the increase in kinetic energy.
16 Which of the following factors would decrease the magnetic field strength of an electromagnet?
increasing the distances between the turns of the coil
17 A student is collecting data about the transfer of kinetic energy using a pitcher of lemonade. She uses the following procedure in one of the trials of her experiment:
Measure the temperature of the lemonade without ice.
Add 10 ice cubes to the pitcher.
Which step should be next in the procedure?
Measure the temperature of the lemonade after the ice has melted.
18 A student adds ice to 150 mL of water. She observes that the temperature of the water decreases after 10 minutes. Which statement best explains the student’s observations?
Kinetic energy was transferred from the water to the ice.
19 Compare conduction to radiation in terms of heat transfer.
Both methods help to evenly distribute energy, but only conduction requires contact between objects.
20 Which factors affect the strength and direction of electrical forces?
types of charges, amount of charge, and distance
21 Which material would be considered a strong conductor of electricity?
silver
22 Which statement about electromagnets is correct?
As the number of turns in the wire increases, the strength of the electromagnet increases.
23Which of these best describes the type of lens shown in the ray diagram?
It shows a convex lens. For this type of lens, the image position depends on the object's position relative to the focus point.
24 What happens to sound waves from an object as it moves toward you?
The pitch gets higher because of an increase in frequency.
25 Which combination of frequencies would produce the lowest beat frequency?
500 Hz and 501 Hz
26 A sound has a higher pitch than a bell. Which quantity must also be higher in this sound than in the bell?
frequency
27Which statement regarding sound traveling in air is correct?
The frequency of a sound does not affect the speed at which it travels.
28 Which statement about the effect of temperature on the speed of sound is correct?
As temperature increases, the speed of sound increases because molecules in the medium collide more frequently.
29 Which forms of electromagnetic radiation are arranged in order of increasing energy?
infrared, microwaves, ultraviolet, gamma rays
30 A student is using a weak computer to design a logo. If the weak computer is the only constraint, should the student use the online version or downloaded version of a graphic design software?
The online version, because the downloaded version usually requires better equipment than the online version.
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29 is actually
microwaves, infrared, ultraviolet, gamma rays