If an moving object suddenly increases speed, what causes this to happen?

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Presentation transcript:

If an moving object suddenly increases speed, what causes this to happen?

A spring scale shows the following readings: Distance PulledSpring Scale Reading 1.0 cm4 N 1.5 cm8 N 2.0 cm12 N 2.5 cm16 N If the spring is pulled 3.5 cm, what would the spring scale read?

Each increase in distance is 0.5 cm. Each reading increases 4 N with each 0.5 increase. Since 3.5 cm is TWO readings more than What is available on the chart you must Extrapolate 4 N more twice. Answer: 24 N

20 N25 N In which direction will the skaters move and at what magnitude?

5 N to the left

A 50 kg boy experiences a 20 N force. What is the expected acceleration?

Looking for acceleration; cover “a” and you see that you need to divide “f” by “m”. 20N / 50kg = 0.4 m/s 2

When this man dives off this boat, the boat moves in the opposite direction. What principle does this illustrate?

For every action force, there is an equal and opposite reaction force.

If you jump out of an airplane, the upward force of air resistance becomes equal to the downward pull of gravity. When these 2 forces become equal, what happens to your fall?

You will continue to fall at a constant speed.

10 N 5 N 15 N 10 N Which way will this box move?

down and to the right

When you put the petal to the metal and “floor it”, what would happen to the full cup of coffee in your cupholder?

It will spill backwards. The car wants to go forward. Because of inertia the cup wants to stay where it’s at.

There is a parked car in the parking lot of Wal Mart. What will cause a change in the Velocity of the car?

The car experiences an unbalanced force.

What is the tendency of an object to resist a change in motion?

Inertia

What will happen to Satellites launched into space?

Since it is a vacuum, the speed and direction will not change. It will remain in motion.

A B C D At which interval are forces on a car balanced?

B to C

All of the balls below will accelerate quickly. Which of the balls will travel the farthest if kicked with the same force?

The smallest one with the least mass.

Which picture below shows acceleration?

All of them. Any change in motion is acceleration. (speeding up, slowing down, and going around a curve)

Why do cars hydroplane on wet roads?

The water reduces friction.

Bicycle brakes are an example of what type of friction?

sliding Friction

What are the other 3 types of friction?

Rolling Static Fluid

What is Newtons 1 st Law?

An object in motion wants to stay in motion. an object at rest wants to stay at rest unless acted upon by an unbalanced force. AKA Law of Inertia.

What is Newton’s 2 nd Law?

An object acted on by a force will accelerate in the direction of the force. AKA F=ma

What is Newton’s Third Law of Motion?

For every action there is an equal and opposite reaction.