SCIENCE

Question 0

What is distance?

Answer 0

the length of the path between two points

Question 1

What is a frame of reference?

Answer 1

a system of objects that are not moving with respect to one another

Question 2

What is displacement?

Answer 2

the direction from the starting point and the length of a straight line from the starting point to the ending point

Question 3

What is the distance between distance and displacement?

Answer 3

Distance is the length of a path

Displacement is a straight line from start to finish

Question 4

What is a vector?

Answer 4

a quantity that has magnitude and direction

Question 5

What happens when you combine displacements in the same direction? In the opposite direction?

Answer 5

same- add the displacements

different- subtract the displacements

Question 6

What is a resultant vector?

Answer 6

the vector sum of 2+ vectors

Question 7

What is speed?

Answer 7

the ratio of the distance an object moves to the amount of time the object moves

Question 8

What is average speed?

Answer 8

the total distance traveled divided by the time it takes to travel that distance
(v=d/t)

Question 9

What is instantaneous speed?

Answer 9

the rate at which an object is moving at a given moment in time

Question 10

What is velocity?

Answer 10

the speed and direction in which an object is moving

Question 11

What is a force?

Answer 11

a push or pull that acts on an objetc

Question 12

What is a net force?

Answer 12

the overall force acting on an object after all the forces are combined

Question 13

What is the difference between balanced and unbalanced force?

Answer 13

A balanced force does not create motion

An unbalanced force creates motion

Question 14

What are the three frictions?

Answer 14

static
rolling
sliding

Question 15

Which is the strongest friction?

Answer 15

static

Question 16

Earth’s gravity acts downwards towards where?

Answer 16

the center of the earth

Question 17

What is terminal velocity?

Answer 17

the constant velocity of a falling object when the force of air resistance equals the force of gravity

Question 18

What is a Newton?

Answer 18

the force that causes a 1 kg mass to accelerate at a rate of 1 m/s

Question 19

What is projectile motion?

Answer 19

the motion of a falling object after it is given an initial forward velocity

Question 20

Which scientist made many scientific discoveries through careful observation and logical reasoning and held back the progress in the study of motion for almost 2,000 years?

Answer 20

Aristotle

Question 21

Which scientist concluded that moving objects would continue to move indefinitely by rolling balls down wooden ramps?

Answer 21

Galileo

Question 22

Which scientist discovered the three laws of motion?

Answer 22

Newton

Question 23

What is inertia?

Answer 23

the tendency of an object to resist a change in motion

Question 24

State Newton’s first law of motion and give an example.

Answer 24

An object at rest tends to stay at rest while an object in motion tends to stay in motion unless acted upon by an unbalanced force.
EX.-stopping a rolling soccer ball

Question 25

State Newton’s second law of motion and give an example.

Answer 25

The acceleration of an objects is equal to the net force acting on it divided by the object’s mass. (A=f/m)
EX.- a big ball and a small ball rolling down a hill

Question 26

State Newton’s third law of motion and give an example.

Answer 26

For every action, there is an equal but opposite reaction.

EX.- person swimming through water

Question 27

What is mass?

Answer 27

a measure of the inertia of an object and depends on the amount of matter an object contains

Question 28

What is weight?

Answer 28

the force of gravity acting on an object

Question 29

What is the difference between weight and mass?

Answer 29

weight is dependent on gravity

mass is dependent on the amount of mass in an object

Question 30

Greater mass equals __________ acceleration.

Answer 30

slower

Question 31

Smaller mass equals __________ acceleration.

Answer 31

larger

Question 32

What kind of force causes an object’s velocity to change?

Answer 32

unbalanced

Question 33

The acceleration and the force of an object acts in the ___________ direction.

Answer 33

same

Question 34

Where would you weigh more: on earth or on the moon?

Answer 34

Earth

Question 35

What is the formula for weight?

Answer 35

w= mass • acceleration due to gravity

Question 36

What is momentum measured in?

Answer 36

Momentum (kg•m/s)= mass (kg) • velocity (m/s)

Question 37

Action-reaction forces are known as a what?

Answer 37

pair of forces

Question 38

What two factors affect momentum?

Answer 38

mass

velocity

Question 39

In a __________ system, the loss of momentum of one object equals the gain in the momentum of another object

Answer 39

closed

Question 40

What are the four universal forces?

Answer 40

Electromagnetic
Strong nuclear
Weak nuclear
Gravitational

Question 41

What are the only two forces that attract and repel?

Answer 41

Electric

magnetic

Question 42

What is the difference between a strong nuclear force and a weak nuclear force?

Answer 42

Strong- acts on neutrons and protons, acts over very short distance, very strong
Weak- acts on all particles, acts over short distance, weaker then strong nuclear force

Question 43

What did Newton’s law of universal gravitation state?

Answer 43

that everything in the universe is attracted to everything else

Question 44

Gravitational force between two objects depends on what?

Answer 44

mass

distance

Question 45

What causes the ocean tides?

Answer 45

moon

Question 46

What are four uses for artificial satellites?

Answer 46

Monitor Earth’s weather
Study Earth’s climate
Receive and transmit calls
Gaze into space