Chapter 2: The Laws of motion

Question 1

Force

Answer 1

A push or pull

Question 2

Newton

Answer 2

The metric or SI unit for force

Question 3

Net force

Answer 3

the combination of all forces acting on an object

Question 4

Friction

Answer 4

The force that two surfaces exert on each other when they rub against each other

Question 5

Gravity

Answer 5

A force that pulls objects towards each other

Question 6

Law of Universal Gravitation

Answer 6

The force of gravity that acts between all objects in the universe

Question 7

Mass

Answer 7

The amount of matter in an object and is measured in kilograms.

Question 8

Free fall

Answer 8

When gravity is the only force acting on an object

Question 9

Air resistance

Answer 9

A force that opposes objects moving through the air

Question 10

Terminal Velocity

Answer 10

The point where the force of gravity is equal to the force of air resistance on an object

Question 11

Projectile motion

Answer 11

The curved path an object follows when it is thrown or propelled near the earth

Question 12

Inertia

Answer 12

The tendency of all objects to resist a change in motion

Question 13

Momentum

Answer 13

The product of the mass and velocity of an object

Question 14

Law of conservation of Momentum

Answer 14

As long as there are no outside forces the momentum of a group of objects will be the same before and after they collide

Question 15

Calculate net force when forces are ; same direction, opposite direction, equal force

Answer 15

Different - add all the forces, greater number is positive and the lesser is negative when adding.
Same - Add all forces
Equal - will always equal 0

Question 16

What is a balanced force

Answer 16

Equal forces acting on an object in opposite directions.

Question 17

What are the two things that effect friction on an object?

Answer 17

1. How hard the surfaces push together
2. The types of surfaces involved

Question 18

four types of friction with an example of each

Answer 18

Static (paper on a table)
Sliding (rubbing hands together)
Rolling (skateboarding)
Fluid (surfing)

Question 19

What did Sir Isaac Newton contribute?

Answer 19

realized gravity was in effect on Earth and everywhere else in the Universe

Question 20

What famous book did Sir Isaac Newton write?

Answer 20

Principia (Philosophae Naturalis Principia Mathematica)

Question 21

What are the two factors that affect gravity?

Answer 21

Mass and Distance

Question 22

What is the constant gravity on Earth?

Answer 22

9.8

Question 23

What is the difference between mass and weight?

Answer 23

Mass is the amount of matter in an object while weight is the amount of gravitational force exerted on an object.

Question 24

formula to calculate the velocity of an object under gravity’s influence.

Answer 24

Velocity = Gravity x Time

Question 25

Newtons three laws of Motion

Answer 25

1. an object will not change its motion unless a force acts on it. 2. the force on an object is equal to its mass times its acceleration. 3. when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

Question 26

What is the relationship between acceleration and force?

Answer 26

Acceleration and force will always occur in the same direction

Question 27

What is the relationship between acceleration and mass.

Answer 27

inverse - Acceleration decreases as mass increases

Question 28

What are force pairs?

Answer 28

all forces act in pairs the result is a net force of zero

Question 29

Formula to calculate the momentum of an object.

Answer 29

Mass x Velocity

Question 30

calculate force

Answer 30

Mass x Acceleration