Newton’s Law and Friction

Question 1

Force

Answer 1

A push or a pull
- Contact force
- Field force

Question 2

Mass

Answer 2

The quantity of matter in an object

Question 3

Weight

Answer 3

The force acting on an object due to gravity

Question 4

Inertia

Answer 4

(Newton’s 1st Law of Motion)

An object at rest will remain at rest unless acted on by an unbalanced force.
An object in motion will remain in motion with constant speed and direction unless acted on by an unbalanced force.

Question 5

Net force

Answer 5

The sum of the forces acting on an object

Question 6

Equilibrium & when it occurs

Answer 6

When the net force on an object is zero
1. The object is at rest
2. The object is moving at a constant velocity (not speeding up, slowing down, or changing direction)

Question 7

Newtons

Answer 7

The unit of force, 1N=1Kg•m/s^2

Question 8

Friction

Answer 8

The force that opposes motion

Question 9

Static friction

Answer 9

The force that resists the start of sliding motion between two touching surfaces at rest

Question 10

Kinetic friction

Answer 10

The force that opposes the motion of two surfaces that are in contact and sliding over each other

Question 11

Normal force

Answer 11

A force that acts on a surface in the direction perpendicular to the surface

Question 12

Free-body diagram

Answer 12

A representation of all of the forces acting on an object (body), isolated from its surroundings (free)

Question 13

Coefficient of Friction

Answer 13

The ratio of the magnitude of the force of friction between two objects in contact to the magnitude
of the normal force with which the objects press against each other