42 terms

Equilibrium

In general, a state of balance where Fnet = 0

Force

Any influence that tends to accelerate an object. A push or a pull; measured in Newtons.

Friction

The force that acts to resist the relative motion (or attempted motion) of objects or materials that are in contact. A force that works against the motion of an object

Kilogram

The fundamental SI unit of Mass.

Mass

A measure of an object's inertia. Also, a measure of the amount of matter in an object. Depends only on the amount of and kind of particles that compose an object - not on its location.

Newton

SI Unit of Force.

Normal Force

For an object at rest, it is the upward force that balances the weight of the object at rest. Also called a Support Force

Support Force

For an object at rest, it is the upward force that balances the weight of the object at rest. Also called a Normal Force

Weight

The force on a body due to the gravitational attraction of another body (commonly the Earth). (***a downward force!***)

Volume

The quantity of space an object occupies

Newton's Second Law

The acceleration of an object is directly proportional to the net force acting on the object, it in the direction of the net force and is inversely proportional to the mass of the object. In other words... F=ma

Free Fall

Motion under the influence of gravitational pull only

Terminal Speed/Velocity

The speed at which the acceleration of a falling object terminates because air resistance balances its weight.

Acceleration

Change in velocity divided by the time it takes for the change to occur

Inverse Proportion

a relation between two quantities such that one increases in proportion as the other decreases.

Direct Proportion

A relationship between two quantities in which one increases as the other increases

Air Resistance

frictional force air exerts on a moving object; acts opposite in direction to the object's motion.

Depends on two things: speed and frontal surface area

Depends on two things: speed and frontal surface area

Net Force

The sum of all forces acting on an object. It is the net force that accelerates a mass (in the direction of the net force).

If an object is accelerating to the right, which direction must the friction point

Left

The acceleration of an object is affected by which two forces?

Mass and net force

A 2kg object has an acceleration of 8m/s2.... What must be the net force acting on it?

16N

An unbalanced force is also known as a

Net force

If an object is being pushed and its mass increases, then its acceleration must

Decreases

If the net force applied to an object increases. Then its acceleration will

Increases

A 5kg suitcase falls out of a plane. When 50N of air resistance acts on it, what is its Fnet?

0N

If the forces of an object are unbalanced, what kind of motion must it have?

Changing motion

A girl pulls her brother on a sled with a net force of 60N. What happened to its motion?

It speeds up

The boy gives a box a big push and then lets go. Friction acts against it. What's happening

It slows down

Which of the following affect Air Resistance on an object

Speed and frontal surface area

An object moves along a straight path. If the net force on it doubled, its acceleration would

Double

Whenever the net force on an object is zero, its acceleration

Is 0m/s2

Slide a book on its widest surface then, on its narrowest surface. Where is the friction greater?

Both same

What's the acceleration of a 10,000 kg jet that's being acted upon with 20,000 N of force

2m/s2

A skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration

decreases

Net force and acceleration are

directly proportional

Which is normally greater: static friction or sliding friction on the same object?

static friction

What is the weight of a 10kg object on earth

100N

What is the mass of a 60kg object on the moon

60kg

What is the weight of 500 grams of bananas

5,000 N

Acceleration is inversely proportional to

mass

Force equals

mass x acceleration

Weight equation

mass x gravity