QQ: A dog ran away from home. He ran 5 miles north, then

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Presentation transcript:

QQ: A dog ran away from home. He ran 5 miles north, then 3 miles east, 5 miles south, and then 3 miles west. How does its distance compare to its displacement? 2. A cheetah can run briefly with a speed of 31.0 m/s. Suppose a cheetah with a mass of 47.0 kg runs at this speed. What is the cheetah’s kinetic energy?

Today’s Objective: I can explain and predict an object’s motion using Newton’s Laws of Motion.

Practice

What would happen if the forces were equal? Balanced…no movement

The team on the left will win because it has 100 N more force. Predict what will happen in the scenario below.

Predict what will happen if the forces do not change. Nothing. They are balanced.  300 +  300 = 0

Which way will the box move? 10 N

Which way will the box move? 8 N 8 N

Which way will the box move? No Movement

What is the SI unit used to measure force and how is it calculated?

What information do you need to calculate an object’s weight? The gravitational constant of the environment AND It’s mass

An object in freefall on Earth will continue to accelerate at 9.8 m/s/s until what happens? The upward force of the force caused by air resistance is equal to the downward force of gravity.

What is caused by the combining of a forward force and the downward force of gravity? Projectile Motion

What is the SI unit used to measure energy and how is it calculated?

A world without friction....

Newton’s 2nd Law of Motion The acceleration of an object is equal to the net force acting upon it divided by the object’s mass.

2nd Law of Motion F = ma F = force M = Mass A = Acceleration

According to Newton’s 2nd Law of Motion, which has the greatest acceleration?

m = 1000 kg m = 1 kg F = ma 1 N = 1 Kg*m/s2 F = 1kg * 9.8m/s/s F = 9800 N F = 9.8 N

Lizette’s car has a mass of 1000 kg Lizette’s car has a mass of 1000 kg. She accelerates from a stop when the light turns green. The force on the car is 4000 N in the forward direction. What is the car’s acceleration?

m = 1000kg a = ? F = 4000 N Choose formula: Isolate Data: F = ma Substitute: 4000N = 1000kg * a Solve: 4000N = a 1000kg 4 N = 4 kg * M/s2 Kg kg = 4m/s2

The mass of JJ’s car is 1,644 kg. What is the weight of her car?

m = 1644 kg w = Fg = ? g = 9.8 m/s2 m = 1644 kg w = ? m = 1644 kg Isolate Data: m = 1644 kg w = Fg = ? g = 9.8 m/s2 Isolate Data: m = 1644 kg w = ? Isolate Data: m = 1644 kg w = Fg = ? Choose formula: Fg = mg Substitute: Fg = 1644kg * 9.8 m/s2 Solve: Fg = 16111 N Solve: Fg = 16111 kg * m/s2

Aldo is lucky enough to be the first astronaut from MHS Aldo is lucky enough to be the first astronaut from MHS. On earth he has a mass of 88 kg and weighs 863 N. On the moon he weighed 141 N. The acceleration due to gravity on Mars is 3.7 m/s2. How much does he weigh on Mars?

Scientific Notation “I’ll have the math homework.”

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