Physics

Question 0

Period of a pendulum (simple harmonic motion)

Answer 0

T=2π√(L/g)

Question 1

Period of a mass on a spring (simple harmonic motion)

Answer 1

T=2π√(m/k)

Question 2

When multiplying 2 vectors that are scalar, such as work, you must multiply by ______. Give an example equation

Answer 2

cos(θ)

example: W = Fdcos(θ)

Question 3

If you are multiplying two vectors and the answer is a third vector (ex, torque), you must also multiply by______. Give an example.

Answer 3

sinθ

example: τ = Frsinθ

Question 4

What are the 4 questions to test conceptual understanding?

Answer 4

Can I visualize it?
Can I draw a picture, graph or diagram of it?
Can I explain it to someone else in layman’s terms?
Can I think of and describe real-life examples?

Question 5

What is a force?

Answer 5

Any influence capable of causing a mass to accelerate.

Question 6

Is force a scalar or a vector?

Answer 6

vector

Question 7

SI unit for force?

Answer 7

Newtons.

Question 8

Break down what a newton is by using F=ma

Answer 8

kg•(m/s^2)

Question 9

what is Inertia?

Answer 9

The ability of an object to resist a change in its velocity.

Question 10

Formula for momentum?

Answer 10

p=mv

Question 11

Acceleration is any change in _______?

Answer 11

Velocity

Question 12

Acceleration describes how quickly the ________ is changing.

Answer 12

velocity

Question 13

If there is no net force, can there be acceleration?

Answer 13

No

Question 14

If force increases, what happens to acceleration?

Answer 14

It depends on the direction of the force. It could cause acceleration to increase or decrease.

Question 15

If there is no acceleration, could there be a force?

Answer 15

Yes, they would just equal out and the net force would be zero.

Question 16

Rule of thumb for direction of acceleration.

Answer 16

An object that is slowing down will have an acceleration directed in the direction opposite its motion.

Question 17

For a projectile, what is the horizontal acceleration?

Answer 17

ZERO

Question 18

For a projectile, does the horizontal velocity change?

Answer 18

NEVER (ignoring air resistance)

Question 19

These things affect air resistance.

Answer 19

1. Cross section area (greater area = more impact with air)
2. Shape (How aerodynamic is it?)
3. Velocity (greater velocity = more air resistance)
4. Mass (greater mass = greater force needed to oppose it)

Question 20

What assumptions should always be made about air resistance unless stated otherwise in the question?

Answer 20

That air resistance is NEGLIGIBLE, and DO NOT consider it unless EXPLICITLY told to do so.

Question 21

Describe what happens at terminal velocity.

Answer 21

This is where the force of gravity equals the force of the air pushing up on the object. Acceleration is at zero.
F(air)=mg

Question 22

Of a bowling ball and a balloon of the same size and shape, which will reach its terminal velocity faster? Which will have a larger terminal velocity?

Answer 22

The balloon will reach its terminal velocity faster.

The bowling ball will have a larger terminal velocity.