AP Physics 1- Dynamics

All objects must be ___ to experience another force.

For all forces other than the force of the Earth, objects must be in contact to experience a force.

What direction is an object's acceleration?

An object's acceleration is in the direction in which forces are unbalanced.

What direction is an object's net force?

The net force is in the direction in which the forces are unbalanced.

Acceleration =?

a=Fnet/What's the first step in Two-body problems?

What's the second step in the two-body problem?

Write Fnet=ma for each object separately. What's the third step in the two-body problem?

One rope =

One tension.

What is the definition of the force of friction?

The force of friction is the force of a surface on an object acting along the surface.

What direction is the force of friction?

The force of friction acts in the opposite direction to an object's motion.

Is the coefficient of friction a force?

The coefficient of μ is not a force.

What is the coefficient of friction?

The coefficient of friction is a number that tells how sticky two surfaces are.

What is the equation for the force of friction?

The force of friction is equal to the coefficient of friction times the normal force, or Ff=μFn.

What do you do to mg (weight) on an inclined plane?

Break into components.

When is the coefficient of kinetic friction used?

The coefficient of kinetic friction is used when an object is sliding.

When is the coefficient of static friction used?

The coefficient of static friction is used when an object is not sliding.

Is the numerical value of static friction infinite?

The coefficient of static friction can take on any value up to a maximum, which depends on the properties of the materials in contact.

What is true about the types of friction when two surfaces are in contact?.

For two specific surfaces in contact, the maximum coefficient of static friction is greater than the coefficient of kinetic friction.

When an object is in free fall, what is true about its vertical acceleration?

Vertical acceleration in free fall is always 10 m/s/s.

When an object is in free fall, what is true about its horizontal acceleration?

Horizontal acceleration in free fall is always 0 m/s/s.

How do velocities in perpendicular directions add?

Velocities in perpendicular directions add with the Pythagorean theorem, just like perpendicular forces.

What is the magnitude of an object's velocity? The magnitude of an object's velocity is known as speed.

How do you approach a projectile problem?

To approach a projectile problem, make two kinematic charts: one vertical, one horizontal.

Wis Newton'ssons Third Law?

Newton's Third Law states that the force of object A on object B is equal to the force of object B on object A.

What is a Third Law Force Pair?

A "third law force pair" is a pair of forces that obeys Newton's Third Law.

What is true about forces in a Third Law Force Pair?

Two forces in a Third Law Force Pair can never act on the same object.

What is circular motion?

An object moving at constant speed v in a circle of radius r has an acceleration of magnitude v^2/r, directed towards the center of the circle.

What direction is acceleration in a circle?

Towards the center.

How do you find the velocity of an object moving in a circle?

d=2πr/T (T= period/time).