SCI Final Study Guide

The change in distance over a specific amount of time is speed.

True

Avery jogs at an average speed of 6 kilometers per hour (km/h). How far does she travel in 45 minutes?

4.5 km

It took Maria 8 seconds to run across a playground. Which additional information does she need to calculate her acceleration during the run?

Her beginning velocity and her ending velocity

A 2 kg rock rolls down a hill at 5 m/s. A 4 kg rock also rolls down the hill at the same speed.

The 4 kg rock, because it’s heavier

If two objects are moving at the same speed, which one has more kinetic energy?

the object with more mass

Velocity is speed with _________________

Direction

A snail crawled from one leaf to another. It traveled a distance of 0.25 meters (m) in 20 seconds (s). What was the snail’s speed? (Show your work on another sheet of paper and turn it in when you are finished with the test)

0.0125 m/s

In which section of the graph is the bike moving away from its starting point?

A

Which line on the graph shows negative acceleration?

D

Acceleration could be speeding up or slowing down or changing direction.

True

What is the average acceleration of a car that slows from 20mph to stopping in 0.2 hrs?

-100mph

The table shows the mass and speed of four objects.

Based on the data, which object has the greatest kinetic energy?

C

If the painter in the last question was at the top of the same ladder on the moon, what would be true about his potential energy?

It would be lower than his potential energy on earth because the pull of gravity on the moon is lower

A coin is resting on top of a card on the top of a glass. You tap the card so that it flies forward. In this investigation, what was set in motion by a force?

all of these

A box is sitting at rest on the floor. A boy pushes east on the box with a force of 10 N. The frictional force between the box and the floor is 2 N. Which statement is true?

The box will move east with a force of 8N

You apply a very small net force, say 0.1 N to a very large truck, with a mass of 2000 kg. Which statement is true?

he truck will move as long as the tiny force is larger than any force of friction that opposes it

Two cars with different masses travel at the same speed down a hill towards a stop sign. What will happen when both cars apply brakes at the same time to stop.

The car with the smaller mass will require less force to stop than the car with the larger mass.

What is the net force?

65 N up

Gravitational attraction between two objects becomes greater the farther away that two objects are from one another.

False

Inertia is _____.

a property of objects that describes their tendency to keep doing what they are already doing

A box is sitting at rest on the floor. A boy pushes on the box with a force of 10 N. The frictional force between the box and the floor is 2 N. Which statement is true?

there is an unbalanced force on the box, so it will accelerate

What causes the balloon to move upward?

B

You are waiting in line to use the diving board at your local pool. While watching people dive into the pool from the board, you realize that using a diving board to spring into the air before a dive is a good example of Newton’s third law of motion. Explain how a diving board illustrates Newton’s third law of motion.

A diving board illustrates the 3rd law because the action force of pushing down on the board results in a reaction force of the board pushing up on the diver

A force that causes an object to slow down when it touches another object is__________________.

Friction

When mass stays the same and you increase the size of the force, how does acceleration change?

the acceleration increases

A small child has a wagon with a mass of 10 kilograms. The child pulls on the wagon with a force of 2 newtons. What is the acceleration of the wagon?

0.20 m/s²

Anthony conducted an experiment using an electromagnet. Use his data to answer the next few questions.

iron nail, wire, battery, ammeter

An energized coil of wire produces a magnetic field. This coil of wire is called a solenoid. Add an iron rod running through the inside of the coil and you have an electromagnet. Of the explanations below, which best describes the two methods to increase the power of the electromagnet?

Increases the number of loops in the coil and increase the electric current flowing through the coil

Where are the field lines the most concentrated around a bar magnet?

at the North Pole and at the South Pole

Electricity is

electrons moving in one direction

A battery that is not hooked up to a circuit contains ___________ energy

chemical potential

The earth is a giant magnet

True

What is represented by the lines surrounding the magnet?

electromagnetic waves

Which of these tools responds to a magnetic field?

compass

If a copper wire is wrapped around a nail and attached to an electric current, it

becomes magnetic and picks up paper clips

This diagram represents____

an electric field

What does this electric circuit symbol represent best?

battery

What does this electric circuit symbol represent?

open switch

What is true about binary signals?

Uses a similar concept as Morse Code, Uses continuous rapid pulses of ones and zeros, Can be checked for errors before they are used, and Interference is less of a problem than with analog signals

Today, most technology uses analog signals.

False

As the wavelength increase, the frequency

decreases

Refraction occurs when a wave enters a new medium at an angle because the _______ changes,

Speed

During constructive interference, the

Amplitude incteases

which of the following wave explains why there are areas in an auditorium where it is harder to hear than other areas?

Diffraction

Which of the following causes a rainbow

Refraction

The transfer of energy that causes something to change position or move is…..

Force

The transfer of energy by electromagnetic waves is also called

Radiation

Which kind of electromagnetic wave travels fastest in a vacuum?

they all travel the same speed

If a wave has a frequency of 5 hz and a wavelength of 8 cm, what would its speed be?

40 cm/s

If a wave was traveling at 500 m/s and had a wavelength of 50, what would its frequency be?

10 Hz

Waves that do not require a medium are ______ waves.

Electromagnetic

As amplitude inscreases what happens to the energy of the wave?

it increases

Which of the following wave properties explains occurs when you see yourself in a mirror?

Refraction

Which type of EM radiation is used on an iPhone?

radio