Forces/Dynamics

Question 1

Dynamics and statics definition and units

Answer 1

Newton (N)

A push or pull

Question 2

What are the fundamental forces

Answer 2

Gravity
Electromagnetic
Strong nuclear
Weak nuclear

Question 3

What is gravity

Answer 3

A force between two masses m1 and m2

Question 4

What is weight

Answer 4

The force of gravity

Question 5

What is mass

Answer 5

The amount of matter in an object

Question 6

What do the letters in Hooke’s law equate to

Answer 6

F force in spring (N)
k spring constant (N/m)
x change in spring’s length (m)

Question 7

What is the force of sliding friction

Answer 7

• friction forces oppose motion

- when a box is pushed there is more force backwards then forwards

Question 8

What does a Free Body Diagram accomplish

Answer 8

Help us find the net force on masses

Question 9

Newton’s Laws of Motion

Answer 9

1) law of inertia (basically the natural state of motion is constant velocity)

2) a is proportional to Fnet
Fnet=ma

3) Fab=-Fba
For every action there is an equal and opposite reactive force

Question 10

What is intertia

Answer 10

Tendency not to change velocity

Question 11

Give an example of when mass differs from weight

Answer 11

What is the mass of 10kg in space? 10kg

What is the weight of 10kg on Earth? 98N