Ch.3 Sec.2

Question 1

Newton’s First Law

Answer 1

An object will stay at rest unless acted on by an unbalanced force. An object in motion will stay in motion unless acted upon by an unbalanced force.

Things will keep moving or stay at rest unless something acts upon it.

Ex. A book sits on the table until you push it off.

Question 2

Newton’s Second Law

Answer 2

The acceleration of an object is proportional to the force acting on it and inversely portional to its mass.

Force creates acceleration, but mass resists it.

Ex. A bigger car takes more force to move

Question 3

Newton’s Third Law

Answer 3

Whenever one object exerts a force on another object, the second exerts an equal and opposite force on the first.

For every action there is an equal opposite reaction.

Ex. A person leans on the wall and the wall pushes back.

Question 4

Inertia

Answer 4

The property of an object that resists change in motion.

An object’s property that resists change in motion.

Ex. More mass more inertia, less mass less inertia

Question 5

Action - Reaction Force

Answer 5

Newton’s Third law - for every action there is an opposite reaction force

For every action an opposite reaction is present which is Newton’s Third law

Ex. Ball and a bat

Question 6

Amount of Inertia

Answer 6

Depends on the mass

Question 7

Example of Laws

Answer 7

1) A person is pushed forward into a car stops.
2) A larger car takes more force to move.
3) A person leans on a wall and the wall pushes back.

Question 8

F = ma

Answer 8

F = force (in Newton’s)
M = mass (in kg)
A = acceleration (in m/sec squared)
For the same acceleration, more mass requires more force. For the same mass, more acceleration requires more force.