23 terms

# Chapter 2 Forces

#### Terms in this set (...)

Acceleration due to Gravity
9.8 m/s²
Acceleration
The rate at which velocity changes .
Rolling Friction
Friction that occurs when a rolling object moves over a surface. This type of friction is easier to overcome than sliding friction.
Free Fall
When the only force acting on a falling object is gravity, it is in . . .
Fluid Friction
Friction that occurs when a solid object moves through a fluid.
Newton's 1st Law
Objects at rest remain at rest and objects in motion remain in motion until acted upon by a an unbalanced force (non zero net force).
Inertia
A tendency for objects to resist a change in motion due to its mass.
Newton's 2nd Law
The acceleration of an object depends on the mass and the force applied. F=ma or a=F/m
Newton's 3rd Law
For every action, there is an equal and opposite reaction.
All forces act in pairs!
Force
The push or pull on an object.
Unit for Force
Newton (N)
Net Force
The combination of all forces acting on an object.
Balanced
Forces
When the forces on an object produce a net force of 0 N. There is then no change in motion.
Unbalanced
Forces
When the net force on an object is NOT 0 N, resulting in a change of motion.
Friction
The force that two surfaces exert on each other.
Sliding Friction
The friction between sliding surfaces. (slows down motion)
Static Friction
When a force is applied to an object but does not cause the object to move.
Gravity
The force of attraction between objects that is due to their masses.
Law of Universal
Gravitation
1) Gravitational force increases as mass increases
2) Gravitational force decreases as distance increases
Weight
The measure of gravitational force on an object.
Mass
The amount of matter in an object.
What affects friction
1) The type of surface
2) How hard the two surfaces are pressing together
What affects gravity
1) Mass
2) Distance