Section 2.2 Force and mass determine acceleration.

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Presentation transcript:

Section 2.2 Force and mass determine acceleration.

Vocabulary ___________________________ states that the acceleration of an object increases with increased force and decreases with increased mass. Newton’s Second Law

So… Increasing Mass Decreases Acceleration! Which shopping cart will have more acceleration if the same force is applied to both carts? So… Increasing Mass Decreases Acceleration! small mass same size force large mass same size force greater acceleration smaller acceleration

So… Increasing Force Increases Acceleration! Which shopping cart will have more acceleration? So… Increasing Force Increases Acceleration! same mass same mass greater force smaller force greater acceleration smaller acceleration

The apple will accelerate more because it has less mass. An apple and a bowling ball are pushed with the same force. Which one will accelerate more? Why? The apple will accelerate more because it has less mass.

Calculating Force F = ma F = force m = mass a = acceleration

Calculating Force Class Example What force is needed to accelerate a 10 kg shopping cart 3 m/s2? F = m x a F = 10 kg x 3 m/s2 F = 30 N

Calculating Force Practice Problem #1 If a 5 kg ball is accelerating 1.2 m/s2, what is the force on it? F = 5 kg x 1.2 m/s2 F = 6 N

Calculating Force Practice Problem #2 A person on a scooter is accelerating 2 m/s2. If the person has a mass of 50 kg, how much force is acting on that person? F = 50 kg x 2 m/s2 F = 100 N

Skip questions # 9-14

Thinking Question It can simply change direction! How can an object accelerate when it does not change speed? It can simply change direction!

True or False? _____ A force can make an object change direction. _____ If an object only changes direction then it is not accelerating. _____ An object moves in the direction the force is applied. _____ Forces can cause acceleration. True False True True

Vocabulary Any force that keeps an object moving in a circle is known as _____________ force. centripetal

Where does the force point towards? If you let go of the string, the ball would fly off in the direction it was headed when you let go. This is called the path of inertia.

What do the blue arrows represent? centripetal force What do the black arrows represent? The path of inertia