Physics Concepts and Practice Questions
BELL WORK
8/19/2020
•
On a sheet of notebook paper, write at the top “Bell
Work”
•
Then write “Wednesday” and answer the following
questions.
1.
Describe the force that pulls an object down.
2.
What are three ways to accelerate (change
velocity)?
3.
If I roll a ball down the road, why does it
eventually stop?
BELL WORK
8/19/2020
•
On a sheet of notebook paper, write at the top “Bell
Work”
•
Then write “Wednesday” and answer the following
questions.
1.
Describe the force that pulls an object down.
2.
What are three ways to accelerate (change
velocity)?
3.
If I roll a ball down the road, why does it
eventually stop?
Gravity pulls an object down.
Speed up, Slow down, or Change direction
Friction between the ball and the road slows it down
and causes it to stop.
FORCES
I.
Nature of Forces
A.
What is Acceleration?
•
Acceleration is the rate at which
velocity (speed and direction)
changes
•
3 ways to accelerate:
1.
Speed up (positive
acceleration)
2.
Slow down (negative
acceleration)
3.
Change direction (neutral
acceleration)
FORCES
•
To calculate acceleration,
•
Use the unit: m/s
2
•
Example:
•
A roller coaster’s velocity at the top
of a hill is 10 m/s. Two seconds later
it reaches the bottom of the hill with
a velocity of 26 m/s. What was the
acceleration of the coaster?
Acceleration =
(Final speed – Initial Speed)
Time
FORCES
•
To calculate acceleration,
•
Use the unit: m/s
2
•
Example:
•
A roller coaster’s velocity at the top
of a hill is 10 m/s. Two seconds later
it reaches the bottom of the hill with
a velocity of 26 m/s. What was the
acceleration of the coaster?
Acceleration =
(Final speed – Initial Speed)
Time
a =
(26 m/s – 10 m/s)
2 s
=
16 m/s
2 s
=
8 m/s/s or
m/s
2
BELL WORK
8/21/20
•
Get out your bell work paper.
•
Write “Friday” and answer the following questions.
1.
Which of these statements are true?
a.
When you press on the gas, the car accelerates.
b.
When you press on the brake, the car accelerates.
c.
When you change lanes, the car accelerates.
2.
Explain your answer to question #1.
3.
Describe the force it would take for the 8
th
graders to win
a tug of war against the 7
th
graders.
BELL WORK
8/21/20
•
Get out your bell work paper.
•
Write “Friday” and answer the following questions.
1.
Which of these statements are true?
a.
When you press on the gas, the car accelerates.
b.
When you press on the brake, the car accelerates.
c.
When you change lanes, the car accelerates.
2.
Explain your answer to question #1.
3.
Describe the force it would take for the 8
th
graders to win
a tug of war against the 7
th
graders.
Acceleration depends on velocity and direction.
(+)
(-)
(neutral)
More force than the 7
th
graders
B.
How are Forces
Described?
•
A force is a push or pull
measured in Newtons
(N).
•
Represented using an
arrow
•
The head of the arrow
is the direction.
•
The length of the
arrow is the strength.
BELL WORK
8/24/2020
•
On a sheet of notebook paper, write at the top “Bell
Work”
•
Then write “Monday” and answer the following
questions.
1.
Describe a force.
2.
Describe the two forces that are working on your
desk seat right now.
3.
Draw a diagram of this.
BELL WORK
8/24/2020
•
On a sheet of notebook paper, write at the top “Bell
Work”
•
Then write “Monday” and answer the following
questions.
1.
Describe a force.
2.
Describe the two forces that are working on your
desk seat right now.
3.
Draw a diagram of this.
A push or pull
Gravity and your weight is
pushing down on the seat. The seat is pushing back
so that it is balanced.
C.
How Do Forces Affect Motion?
•
Net force is the combination
of all forces on an object.
•
It determines the motion!
•
If net force is zero, there
is no motion; it is
balanced. (sitting in
chair)
•
If net force is not zero, it
will move in the direction
of the largest force; it is
unbalanced.
(driving a car)
•
To determine net force, add or
subtract all the net forces acting
on an object.
•
If the forces are going in the
same direction, add.
•
If the forces are going in
opposite directions, subtract.
1.
2.
•
To determine net force, add or
subtract all the net forces acting
on an object.
•
If the forces are going in the
same direction, add.
•
If the forces are going in
opposite directions, subtract.
1.
2.
-
= 0 N
No motion
balanced
-
= 100 N
motion
unbalanced
Explore the fundamental concepts of physics such as forces, acceleration, and velocity through a series of practice questions and explanations. Understand how gravity pulls objects down, ways to accelerate, and the forces at play in everyday scenarios. Practice calculating acceleration and learn how it relates to velocity changes in various situations.
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Presentation Transcript
BELL WORK On a sheet of notebook paper, write at the top Bell Work Then write Wednesday and answer the following questions. 1. Describe the force that pulls an object down. 8/19/2020 2. What are three ways to accelerate (change velocity)? 3. If I roll a ball down the road, why does it eventually stop?
BELL WORK On a sheet of notebook paper, write at the top Bell Work Then write Wednesday and answer the following questions. 1. Describe the force that pulls an object down. Gravity pulls an object down. 8/19/2020 2. What are three ways to accelerate (change velocity)? Speed up, Slow down, or Change direction 3. If I roll a ball down the road, why does it eventually stop? Friction between the ball and the road slows it down and causes it to stop.
FORCES I. Nature of Forces A.What is Acceleration? Acceleration is the rate at which velocity (speed and direction) changes 3 ways to accelerate: 1.Speed up (positive acceleration) 2.Slow down (negative acceleration) 3.Change direction (neutral acceleration)
FORCES To calculate acceleration, Acceleration =(Final speed Initial Speed) Time Use the unit: m/s2 Example: A roller coaster s velocity at the top of a hill is 10 m/s. Two seconds later it reaches the bottom of the hill with a velocity of 26 m/s. What was the acceleration of the coaster?
FORCES To calculate acceleration, Acceleration =(Final speed Initial Speed) Time Use the unit: m/s2 Example: A roller coaster s velocity at the top of a hill is 10 m/s. Two seconds later it reaches the bottom of the hill with a velocity of 26 m/s. What was the acceleration of the coaster? a = (26 m/s 10 m/s) 2 s =8 m/s/s or m/s2 =16 m/s 2 s
BELL WORK Get out your bell work paper. Write Friday and answer the following questions. 1. Which of these statements are true? a. When you press on the gas, the car accelerates. b. When you press on the brake, the car accelerates. c. When you change lanes, the car accelerates. 2. Explain your answer to question #1. 8/21/20 3. Describe the force it would take for the 8th graders to win a tug of war against the 7th graders.
BELL WORK Get out your bell work paper. Write Friday and answer the following questions. 1. Which of these statements are true? a. When you press on the gas, the car accelerates. b. When you press on the brake, the car accelerates. c. When you change lanes, the car accelerates. 2. Explain your answer to question #1. Acceleration depends on velocity and direction. 8/21/20 (+) (-) (neutral) 3. Describe the force it would take for the 8th graders to win a tug of war against the 7th graders. More force than the 7th graders
B. How are Forces Described? A force is a push or pull measured in Newtons (N). Represented using an arrow The head of the arrow is the direction. The length of the arrow is the strength.
BELL WORK On a sheet of notebook paper, write at the top Bell Work Then write Monday and answer the following questions. 1. Describe a force. 8/24/2020 2. Describe the two forces that are working on your desk seat right now. 3. Draw a diagram of this.
BELL WORK On a sheet of notebook paper, write at the top Bell Work Then write Monday and answer the following questions. 1. Describe a force. A push or pull 8/24/2020 2. Describe the two forces that are working on your desk seat right now. pushing down on the seat. The seat is pushing back so that it is balanced. Gravity and your weight is 3. Draw a diagram of this.
C.How Do Forces Affect Motion? Net force is the combination of all forces on an object. It determines the motion! If net force is zero, there is no motion; it is balanced. (sitting in chair) If net force is not zero, it will move in the direction of the largest force; it is unbalanced. (driving a car)
To determine net force, add or subtract all the net forces acting on an object. If the forces are going in the same direction, add. If the forces are going in opposite directions, subtract. 1. 2.
To determine net force, add or subtract all the net forces acting on an object. If the forces are going in the same direction, add. If the forces are going in opposite directions, subtract. 1. - No motion balanced = 0 N - = 100 N unbalanced 2. motion
