Science Forces and Motion

Force

A push or pull applied to an object

Net force

When two or more forces act on an object at the same time

Balanced Forces

Forces are equal

What is the net force of a balanced force?

0

Unbalanced Forces

One force is greater than another. Net force positive

Inertia

the tendency of an object to resist any change in motion

Newton’s First Law of Motion

An object in motion stays in motion, an object at rest stays at rest until an unbalanced net force acts upon it

What is another name for Newton’s 1st Law?

The Law of Inertia

Newton’s 2nd Law of Motion

Force= mass times acceleration

What determines acceleration?

The size of force and the mass of an object

Newton’s 3rd Law of Motion

For every action, there is an equal and opposite reaction.

Distance v. Time Graph. What do these things mean? 1. Flat Horizontal Line. 2. Straight line slanting up. 3. Line gets steeper

1. Object is not moving. 2. Object is moving at a constant speed. 3. Speed is increasing.

Speed vs. Time Graph.

1. Flat horizontal line

2. Diagonal Line slanting up

3. Diagonal Line slanting down

1. object is moving at a constant speed

2. Object is accelerating

3. Object is decelerating

Speed (definition, formula, and unit)

the distance an object travels per unit time. v=d/t, m/s

Velocity (formula and unit)

v=d/t, needs a direction. m/s (direction)

Acceleration

rate of change of velocity

Friction

force that opposes the sliding motion of two objects

Gravity

Any two masses that exert an attractive force on each other

Mass

The amount of matter in an object

Weight

gravitational force exerted on an object

What unit is used to measure the following:

1. Mass

2. Acceleration

3. Force

1. kg

2. m/s²

3. N

A projectile follows a _______ path

curved

centripetal acceleration

Acceleration towards the center of a circular path

Centripetal Force

force acting towards the center of a circular path

what is the acceleration formula

a= (Vf-Vi)/t

What is the speed formula

v = d/t