acceleration & momentum

Making Things Go

Ms. Shinkle

October 5-6, 2007

Acceleration

Acceleration

• To accelerate an object, a force must be applied.

• The force on the object must come from outside the object.

Acceleration

Acceleration

• If more force is applied, an object will be accelerated ____

• If an object is more massive it will be accelerated ____

more

less

Accelerated Accelerated Motion GraphMotion GraphAccelerated Accelerated

Motion GraphMotion Graph

Positive & Positive & Negative Negative

AccelerationAcceleration

Effect of Mass on Effect of Mass on AccelerationAcceleration

F = ma

Acceleration

Acceleration

• Difference in velocity over time

Acceleration = final velocity – initial velocity time

a = (vf – vi)/ t

Momentum

Momentum

• Property of a moving object due to its mass and velocity

• Momentum has a direction• Momentum is ZERO if object is

not moving

Momentum = mass x velocityp = mv

How Much How Much Momentum?Momentum?

• A slow moving elephant– Although it has a small

velocity, it has a lot of mass

Momentum = mass x velocityp = mv

• A bullet– Although it has a small mass it has a very large velocity