1. Acceleration

acceleration

Announcements

• Test Corrections due Friday, 10/9. Can be found under "Assignments" on CTLS. Remember you only have 1 attempt. Credit only given when correct answer AND explanations are provided.

• Topics for Unit 3: Acceleration, Graphs, Free Fall Motion, Projectile Motion, and Newton's 2nd Law of Motion

• Quiz set for 10/16 and Test set for 10/23

Multiple Choice

Are the forces acting on the rope balanced or unbalanced?

• Balanced
• Unbalanced

Multiple Choice

Which could be an example of an unbalanced force?

• A plate sitting on a dining table
• A ball at the top of a hill that is not moving
• Earth orbiting the Sun 
• A baseball that has been thrown to home plate.

Multiple Choice

Which of the following statements is true?

• Balanced forces cause a change in motion.

• Unbalanced forces cause a change in motion.

• Forces do not effect the change in motion.

Multiple Choice

A girl is pushing a cart by herself with a force of 7 N. What will happen if a boy begins to help her and their combined force is 17 N?

• The cart will speed up.
• The cart will slow down.
• The cart will move at a constant speed in a straight line.
• The cart will fly to never never land!

Acceleration is....

A change in velocity!

Remember velocity is speed + direction.

Open Ended

Name the 3 controls on an automobile that cause it to accelerate:

Multiple Select

Select what is true for the motion, acceleration, and activity of dudette.

• motion in + direction

• motion in - direction

• speeding up

• slowing down

***POSITIVE DIRECTION******

Multiple Select

Select what is true for the motion, acceleration, and activity of dudette.

• moving in + direction

• moving in - direction

• speeding up

• slowing down

Multiple Select

Select what is true for the motion, acceleration, and activity of dudette.

• moving in the + direction

• moving in the - direction

• speeding up

• slowing down

Multiple Select

Select what is true for the motion, acceleration, and activity of dudette.

• moving in the - direction

• moving in the + direction

• speeding up

• slowing down

Open Ended

Do the dudes have the same acceleration?

Open Ended

A car does not change its speed, but it is accelerating. How is this possible? ​

Get ready to input your answer on the next slide:

Open Ended

A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is its average acceleration?​

Get ready to input your answer on the next slide:

Open Ended

A CAR ADVERTISEMENT STATES THAT A CERTAIN CAR CAN ACCELERATE FROM REST TO 70 KM/H IN 7 SECONDS. FIND THE CAR’S AVERAGE ACCELERATION.​

Get ready to input your answer on the next slide:

Open Ended

Challenge question:

IF A FERRARI, WITH AN INITIAL VELOCITY OF 10 M/S, ACCELERATES AT A RATE OF 50 M/S/S FOR 3 SECONDS, WHAT WILL ITS FINAL VELOCITY BE​

Multiple Select

Select what is TRUE about Acceleration.

• it's a change in velocity

• it means an object can be speeding up

• it means an object can be slowing down

• it means an object can be changing direction at a constant speed

• it means the object is moving in a straight line at a constant speed

Multiple Choice

A roller coasters accelerates from an initial velocity of of 6.0 m/s to a final velocity of 70 m/s over 4 seconds.  What's the acceleration?

• 24 m/s²
• 18 m/s²
• 16 m/s²
• 16 m/s

Multiple Choice

A box sliding down an inclined plane attains a velocity of 27 m/s in 3 seconds from rest.  Find the acceleration.

• 30 m/s
• 24 m/s²
• 9 m/s²
• 81 km/hr