Laws of Motion Day 2

Review… A full coffee mug has a mass of 0.60 kg and an empty coffee mug has a mass of 0.30 kg. Which mug would have a greater acceleration if pushed with a force of 3 N? Why?

Sammy Sosa hits a 0.15 kg baseball and accelerates the ball at a rate of 30,000 m/s2. How much force does Sosa exert on the ball?

1st Law of Motion – Law of Inertia You’ve always heard: “An object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an outside force” NOW . . . it’s the same concept, but the vocabulary has changed . . . “An object will have a constant velocity unless acted upon by an outside force” What is constant velocity?? Constant = the same, not changing Velocity = speed with direction Constant velocity = moving at the same speed

F = ma 2nd Law of Motion F = ma could be written two other ways. Solve for “a”. Solve for “m”. What relationships do you see?

3rd Law – Equal and Opposite When the air escapes and pushes down, there is an equal and opposite reaction and the balloon pushes up.

More 3rd Law: Equal and Opposite Law of Conservation for Mass and Energy = Neither mass nor energy can be created or destroyed . The mass and energy that you start with has to equal the mass and energy that you end with. ma = ma

mA = Ma Does the car or butterfly have a bigger mass? Who experienced a larger acceleration? Who experienced a larger force?

m1a1 = m2a2

A 1000 kg steel ball is used to strike a 50 kg stone block causing the block to accelerate at a rate of 20 m/s2. Determine the rate at which the ball accelerates as result of hitting the block.