Let’s start with everyday language

Let’s start with everyday language What do you say when a sports team is on a roll? They may not have the lead but they may have ___________ MOMENTUM A team that has momentum is hard to stop.

Momentum

Newton’s First Law A body in motion stays in motion…unless acted upon by an unbalanced force Momentum will only deal with inertia in motion

Which hurts more if he hits you? Use the words mass and velocity

What is Momentum? An object with a lot of momentum is also hard to stop Momentum: p = mass x velocity Units: kg∙m/s Momentum is also a vector (it has direction)

True or False? P=mv Something massive moving fast carries a lot of momentum • True

True or False P=mv Something REALLY massive moving slowly carries a lot of momentum. • True

True or False P= mv Something with little mass doesn’t carry much momentum unless it goes fast • True

True or False P=mv An object at rest has a very small amount of momentum • False, it has no momentum

Review Which has greater momentum? Bubble Wrecking Ball

Let’s practice P=mv • A 1200 kg car drives west at 25 m/s. What is the car’s momentum? • Identify the variables: • 1200 kg = mass • 25m/s, west = velocity P = mv = 1200 kg x 25 m/s = 30 000 kg- m/s, west

A Project • Get with your partner • Divide your paper into 8 squares (hotdog, hamburger, hamburger) • On the top put objects with a lot of momentum • On the bottom, their opposites

Momentum LARGE AMT OF MOMENTUM Large Mass Large Mass High Velocity High Velocity SMALL AMT OF MOMENTUM Small Mass Small Mass Low Velocity Low Velocity

Let’s start with everyday language