Mod. 4 - Lesson 1 (Force And Motion)

Question 1

Force

Answer 1

A push or pull

Question 2

Magnitude

Answer 2

Distance or quantity

Question 3

The symbol F is…

Answer 3

A vector notation that represents the size and direction of a force

Question 4

The magnitude of a force is measured in what units?

Answer 4

Newtons (N)

Question 5

All accelerations are…

Answer 5

The result of an unbalanced force acting on an object

Question 6

System

Answer 6

Object(s) that can interact with each other or the external world

Question 7

External world

Answer 7

Anything the system can interact with

Question 8

Contact force

Answer 8

When something from the external world touches the system (it exerts a force on it)

Question 9

Field forces

Answer 9

Exerted without contact
Ex: gravitational force

Question 10

Agent

Answer 10

The specific and identifiable cause of contact or field force
Ex: your hand (agent) exerting a force on a book (system)

Question 11

A force does not exist if?

Answer 11

There is not both an agent and a system

Question 12

Free body diagram

Answer 12

A physical representation that shows the forces acting in a system

Question 13

All accelerations are?

Answer 13

The result of unbalanced forces

Question 14

If a motion diagram shows that an object is accelerating, a free body diagram of that object should have an unbalanced force..?

Answer 14

In the same direction as the acceleration

Question 15

When you push in the table on the table in opposite directions with the same amount of force, there is no unbalanced force, so…

Answer 15

The table does not accelerate but remains at rest

Question 16

Net force

Answer 16

The vector sum is all the forces on an object

Question 17

y=kx+b

Answer 17

The y intercept is 0 so it simplifies to y=kx. The y variable is acceleration. The x variable is force. Therefore acceleration is equal to the slope of the line multiplied by the applied net force

Question 18

a=Fnet/m

Answer 18

Acceleration = Net force / mass
(Newtons second law)

Question 19

Fnet=ma

Answer 19

Force net (newton) = mass times acceleration

Question 20

Net force

Answer 20

Sum of all forces acting on a system

Question 21

Newton’s second law

Answer 21

States that the acceleration of an object is proportional to the net force and inversely proportional to the mass of the object being accelerated

Question 22

Newton’s first law

Answer 22

An object that is at rest will stay at rest and an object will stay in motion unless acted on by another force

Question 23

If acceleration equals zero

Answer 23

Then velocity does not change

Question 24

Newton’s second law says that if Fnet = 0

Answer 24

Then acceleration equals 0

Question 25

Inertia

Answer 25

The tendency of an object to resist changes in velocity

Question 26

Equilibrium

Answer 26

If the net force on an object is zero
If it is moving at a constant velocity (velocity doesn’t change)
(A net force disturbs a state of equilibrium)