Acceleration

What is Acceleration?

It is a change in velocity over time.

Can objects speed up or slow down?

Yes.

Formula for change in velocity?

Delta V = V - Vo

What does the formula for change in velocity tell us?

It tells us if the Acceleration is positive or negative

Change in velocity increases, acceleration _____________ (and time is the SAME)

increases (direct relationship)

When we go forward, positive acceleration = speeding up or slowing down?

Speeding up

When we go forward, negative acceleration = speeding up or slowing down?

Slowing down

When going backwards, positive acceleration = speeding up or slowing down?

slowing down

When we go backwards, negative acceleration = speeding up or slowing down?

speeding up

What does Acceleration tell us about time?

It tells us how much time it takes for an object to speed up or slow down. (delta V)

When time increases, acceleration _______ (and change in velocity (delta v) is the same))

decreases

Acceleration Equation

a = Delta V/t a = Vf - Vi/t

Units for velocity and distance

velocity/time distance/time/time

If an object is moving in a circle with a constant speed, it is accelerating

True

Which will cause an object to slow down?
positive velocity and positive acceleration
positive velocity and negative acceleration

negative velocity and negative acceleration
negative velocity and positive acceleration

positive velocity and negative acceleration negative velocity and positive acceleration

Which will cause an object to speed up?
positive velocity and positive acceleration
positive velocity and negative acceleration

negative velocity and negative acceleration
negative velocity and positive acceleration

positive velocity and positive acceleration negative velocity and negative acceleration

An object has a velocity of -5 m/s and an acceleration of 1 m/s/s. What is true about the object? it's moving backward

it's moving forward
it's speeding up
it's slowing down

moving backward and slowing down. Slows down because of negative velocity and positive acceleration. Moving backwards because of negative velocity.

An object has a velocity of 10.5 m/s and an acceleration of 2.5 m/s/s. What is true about the object?

it's moving backward
it's moving forward

it's speeding up
it's slowing down

Moving forward because Velocity is positive. Speeding up because Velocity and Acceleration are both positive.

When velocity is negative ,we are going backwards for forward?

backwards

An object has a velocity of 15 m/s and an acceleration of -3.0 m/s/s. What is true about the object?
it's moving backward
it's moving forward

it's speeding up
it's slowing down

Going forwards because velocity is positive. Positive velocity and negative acceleration (+ and - = -) so slowing down.

An object is moving with a constant acceleration (speeding up). Which of the following is true?
1) In equal times it moves equal distances.
2)In equal times its velocity increases by equal amounts.
3) In equal times it moves larger and larger distances.

4) In equal times it moves smaller and smaller distances.
5) In equal times its velocity decreases by equal amounts.

2 and 3

What is acceleration in terms if velocity

Acceleration (a) is the change in velocity (Δv) over the change in time (Δt)

What is velocity in terms of distance?

Velocity is the measure of the amount of distance an object covers in a given amount of time. Here's a word equation that expresses the relationship between distance, velocity and time: Velocity equals distance travelled divided by the time it takes to get there.

A skydiver is falling downward and speeding up as they fall. Which of the following describes the skydiver's motion?
*
1 point
Positive Velocity
Negative Velocity
Positive Acceleration
Negative Acceleration

NOTE IT SAYS DOWNWARDS! So negative Velocity because remember it is downwards and negative acceleration

A car is traveling to the right and brakes to a stop as it approaches a red light. Which of the following describes the car's motion?
*
0/1
Positive Velocity
Negative Velocity

Positive Acceleration
Negative Acceleration

Positive velocity because the car is going forwards! Negative acceleration because the car is slowing down.

You pull a wagon to the right to increase its speed in that direction. Which of the following describes the wagon's motion?
*
1/1
Positive Velocity

Negative Velocity
Positive Acceleration

Negative Acceleration

Positive velocity because we are going forward. Positive acceleration because we are increasing speed.

A tennis ball is thrown upwards and slows down. Which of the following describes the ball's motion?
*
0/1
Positive Velocity
Negative Velocity

Positive Acceleration
Negative Acceleration

Positive velocity we are going upwards. Negative acceleration because ball slows down.