Newtons laws

Question 1

Newtons 1st law of motion (Has 2 parts)

Answer 1

A. An object at rest will remain at rest until an unbalanced (net) force acts upon it.
B. An object in motion will remain in motion at a constant speed, in a straight line until an unbalanced (net) force acts upon it.

Question 2

Inertia

Answer 2

The tendency of an object to resist a change in its motion. The amount of Inertia an object has depends on its mass.

Question 3

Remember - An unbalanced (net) force will cause some type of _________.

Answer 3

Acceleration

Question 4

3 types of friction

Answer 4

1. Static friction (no motion)
2. Sliding friction (sliding motion)
3. Rolling friction (rolling motion)

Question 5

Newtons 2nd law of motion

Answer 5

An object acted upon by a net force will accelerate in the direction of that force.

Question 6

Formula for Acceleration

Answer 6

Acceleration = force/mass

Question 7

Formula for force

Answer 7

Force = Mass x Acceleration

Question 8

Formula for mass

Answer 8

Mass = Force/acceleration

Question 9

Force unit -

Answer 9

Newtons (N)

Question 9

Action and reaction force example - trampoline

Answer 9

Action force: The force of the person pushing downward against the trampoline.
Reaction force: The force of the trampoline pushing the person upward with an equal force, in the opposite direction.

Question 9

Newtons 3rd law of motion

Answer 9

For every action force, there is an equal and opposite reaction force
Forces act in pairs

Question 9

Mass unit -

Answer 9

Kg

Question 10

Gravity

Answer 10

• The attraction force that exists between any two objects that have mass.
• The strength of gravity depends on 2 factors:
  1. Mass of the objects (Directly proportional)
  2. The distance between them (Inversely proportional)

Question 11

Weight vs Mass

Answer 11

Weight:
Definition - The measure of the force of gravity pulling on an objects
Measured in - Newtons
Remains constant or can change? - Will change depending on the force of gravity.
Mass:
Definition - The amount of matter in an object
Measured in - Grams
Reman constant or can change? - Will remain constant.

Question 12

Why don’t satellites fall to earth?

Answer 12

They do!
*They are placed in space high enough where they DO NOT encounter Air resistance to slow them down.
*They are moving so fast horizontally, their curved path downward matches the curve of the earths surface and never touch the ground.
*Satellites need the perfect combination of VELOCITY and HEIGHT to make their curved orbit perfectly match the curve of earth.

Question 13

Air resistance

Answer 13

A type of friction where gas particles in the atmosphere collide with moving objects. The FORCE causes the object to slow down and also causes NEGATIVE acceleration. HIGHER SPEED = MORE AIR RESISTANCE

Question 14

Terminal Velocity

Answer 14

Occurs when the forces of gravity and air resistance are equal. At terminal velocity, objects fall at a constant speed, therefore, acceleration = zero.