Chapter 3 Newton’s Laws of Motion (Defs.)

Question 1

The study of the causes of motion.

Answer 1

Dynamics

Question 2

The SI unit of force
(1 __ = 1 kg•m/s^2)

Answer 2

Newton (N)

Question 3

A simple sketch of all objects involved in a situation.

Answer 3

System diagram

Question 4

A simple drawing of an object showing all the forces that are acting on it.

Answer 4

Free-body diagram (FBD)

Question 5

A force that results when one object makes contact with another and pushes or pulls on it.

Answer 5

Applied force

Question 6

A pulling force from a rope or string on an object that always points toward the rope or string.

Answer 6

Tension

Question 7

A perpendicular force exerted by a surface on an object in contact with the surface; the _____________ always points away from the surface.

Answer 7

Normal force

Question 8

Opposes the sliding of two surfaces across one another; ___________ acts opposite to the motion or attempted motion.

Answer 8

Friction

Question 9

Force of attraction between any two objects.

Answer 9

Force of gravity

Question 10

The sum of all forces acting on an object.

Answer 10

Net force

Question 11

The property of matter that causes it to resist changes in motion; _____ is directly proportional to the mass of the object.

Answer 11

Inertia

Question 12

An object will remain at rest or continue to move at constant velocity when the net force on the object is zero.

Answer 12

First law of motion

Question 13

An object will accelerate in the direction of the net force; the magnitude of the acceleration is directly proportional to the magnitude of the net force and inversely proportional to the object’s mass.

Answer 13

Second law of motion

Question 14

Each action force has a reaction force that is equal in magnitude and opposite in direction.

Answer 14

Third law of motion