Forces and Motion Quest

Define the Law of Universal gravitation.

Newton's law is that all objects in the universe attract each other by the force of gravity.

Describe the three types of friction.

Sliding Friction: Objects sliding over each other causes sliding friction. Rolling Friction: Rolling friction is created by objects such as wheels or ball bearings. This tends to have less friction than Sliding friction. Fluid Friction: A force exerted by a fluid is called fluid friction. Air resistance is an example of this friction.

What is newton's first law of motion?

The first law of motion states that an object at rest will remain at rest and an object in motion will remain in motion at constant velocity unless acted upon by an unbalanced force.

How is a force involved when the sails of a windmill turn?

The force of the wind turns the sails, because without that force, it would remain still because of inertia/ Newton's first law.

Explain how Newton's laws affect the motion of an object.

The object's motion in it's resting state represents inertia, because the object is not moving. The second law represents the things which move the object in different directions, Force, mass, and acceleration are all quantities that move the object. His third law, states that with any action, there is an equal opposite reaction, so if you push or pull anything, the object or you will move accordingly to the surrounding situations.

What is newton's third law of motion?

The third law of motion states that for every action, there is an equal opposite reaction.

What three quantities are related in Newton's second law of motion and how are they related?

The three quantities are Force, mass, and acceleration. Force=mass*acceleration. Acceleration and Force are related because force over mass causes acceleration, force over acceleration equals mass, and mass over force equals acceleration. The greater the force, the more the acceleration. If the object has greater inertia, the force needs to be increased to accelerate the object.

Explain station # 2, why did the flat sheet of paper drop slower than the sheet which was crumpled?

This is because of air resistance.

Why would marble drop at the same rate as a bowling ball?

This is because they have the same air resistance and gravity is the same for both objects.

What is the use of cleats on athletes feet?

To give the shoes more friction to the ground so they will not slide.

What is the difference between weight and mass.

Weight = Mass X acceleration due to gravity. W = M x G. Mass, is the density of an object. Weight is the measure of force of gravity on an object.

When a basketball is dropped on the ground, it bounces up. Is a force needed to make it bounce up? if so, what exerts the force?

Yes. The ground pushes the ball back up.

Inertia is the property in matter which resists...

a change in motion

"Crumpled vs. un-crumpled paper being dropped ... The un-crumpled paper drifted and fell more slowly than the crumpled paper. Crumpled with pennies and crumpled without pennies ... Both crumpled fell at the same rate ... the pennies did not make a difference."

"The flat paper had more air resistance because it had more surface area. It has more contact with air, and the air resistance was increased and slowed it down more than the crumpled piece. For the crumpled with pennies, they still fell as about the same rate because air resistance was equal."

"When a penny and two pennies were dropped at the same time, they landed at the same time. They basically fell at the same rate. It didn't matter how many were taped together, they dropped at the same rate. That rate was gravity."

"The pennies dropped at the same time because gravity pulled on them in the same way, with the same force. The acceleration of gravity was the same for both."

Define balanced forces and unbalanced forces.

A balanced force occurs when two forces that push or pull opposite directions are of the same size. Unbalanced force is when a force in a certain direction is stronger than another.

What is a force?

A force is a push or pull. It gives energy to an object. It can cause it to start moving, stop moving, or change direction.

Describe how forces are related to motion.

A force sets an object into motion, or stops an object's motion.

What is a newton?

A newton equals the force required to accelerate one kilogram of mass at one meter/second/second.

What is the only factor which changes an objects fall?

Air resistance.

How would all objects accelerate if they fell in a vacuum?

All objects would accelerate at the same rate if they fell in a vacuum because there is no air resistance.

What is friction? Explain how it affects the motion of an object.

Friction is a force that acts in a direction opposite to the motion of the moving object. Friction will cause a moving object to slow down and finally stop.

The force that opposes the motion of an object is called...

Friction.

What is gravity and what is it's acceleration rate?

Gravity is the acceleration of a falling object is due to the force of gravity between the object and the earth. Gravity is 9.8 meters per second per second or 9.8 m per second or gravity = 9.8 m/s^2

The force of attraction that exists between all objects in the universe is...

Gravity.

What is inertia and how is it involved in newton's first law of motion?

Inertia is the property of matter that tends to resist any change in motion. This means, the more massive the object, the more force it will take to move it. Thus, inertia is related to mass.

Explain why a single force would not exist.

It would not exist because objects would either only be in motion or stopped during the whole time.