This is... Forces

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3 Laws

Friction

Unbalanced Forces

Misc.

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Define Newton’s 1 st Law

An object in motion (constant velocity) stays in motion, and an object at rest stays at rest, unless acted on by an unbalanced force. An object in motion (constant velocity) stays in motion, and an object at rest stays at rest, unless acted on by an unbalanced force.

In words, what is Newton’s 2 nd Law?

Force is equal to the product of the mass and acceleration

What are the 3 equations used in Newton’s 2 nd law?

F= M x A M = F/A A = F/M

What is Newton’s 1 st Law also called?

The Law of Inertia

Name three types of Friction?

Rolling Friction Sliding Friction Fluid Friction Static Friction

What are three forces a person rollerblading is experiencing?

Rolling Friction Fluid Friction Gravity Inertia

What is friction?

Friction is the force created when 2 surfaces rub together.

What direction does friction always go?

Friction is the force that is opposite to the direction of the movement of the object.

What is it called when two unequal forces are acting on the same object?

Unbalanced Forces

When an unbalanced force is applied to an object, the result is________?

Acceleration (or movement)

If two forces are acting in the same direction on the same object. (They are working together) How do you calculate the net force?

When in the same direction you add

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When gravity and air resistance are in balance (they are equal), what happens to the velocity of a falling object?

The velocity remains constant.

What is force?

A push or a pull

When mass is increased, and acceleration remains constant, what happens to force?

Force also increases.

Given Force and Mass, what is the equation to find acceleration?

Acceleration = Force Mass

What is inertia?

The tendency of objects to resist a change in motion.

DOUBLE JEOPARDY

Calculations

Gravity

Elastic Force

Misc

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How much force is required to move a 15 kg skeleton at an acceleration of 3 m/s/s?

45 kg ● m/s/s 45 N

A 2 kg skateboard hits the planter with a force of 46 N (kgm/s/s), what was its acceleration?

23 m/s/s

How much are you and your team willing to risk?

If a 2,500 kg Toyota accelerates 5.8 m/s/sec and a 2,700 kg Honda accelerates 5.4 m/s/s. Which car has the greatest force and by how much?

Toyota = 14,500 N Honda = 14,580 N The Honda has a greater force by 80N

What is the net force? 6 N 2N

4 N

What causes gravity on Earth?

The mass of the Earth

Why does your weight change if you travel to the moon, but your mass does not?

Weight is a measure of gravity. Mass is the amount of matter in something. Mass does not change.

Where would an object have a greater weight?

The sun, a place with more gravity

What forces are acting upon this falling sphere?

Gravity is pulling down, fluid friction is pushing it up. Fluid Friction Gravity

Matter is considered elastic if…?

…it returns to its original shape after it has been squeezed or stretched.

What are two types of elastic forces?

Tension and Compression

Which elastic force describes standing?

Compression

What forces does a hanging yo-yo experience?

Tension pulling up on the yo-yo by the string, and gravity pulling down on the yo-yo.

What are the two components (parts) of Force as represented by an arrow?

Magnitude (size or amount) and Direction

How does one determine how strong a force is by looking at an arrow?

The strength is determined by the length of the arrow.

When rolling 4 separate bowling balls (6lb, 8lb, 10lb, 12lb) with the same force, which will move the fastest?

The 6lb bowling ball.

How much are you and your team willing to risk?

Why is a car driving around and around a track at the exact same speed experiencing unbalanced forces?

The car is experiencing unbalanced forces because it is in motion.

Final Jeopardy You’ll have 60 seconds

Forces Make your wagers now

A baseball player catches a fly ball in his glove. What type of force did he apply to the ball in order to get it to stop?Which direction?

A unbalanced force – it changed the motion of the ball