IPC Review Part 1

​IPC Review 1

By Jennifer Guillory

• IPC.5A position, velocity, acceleration, and time

• IPC.5B relationship between mass and acceleration in terms of the net force

• IPC.5C momentum and impulse

3 questions for each of these topics

​Distance/Time graphs

• Diagonal line shows CONSTANT speed

• The SLOPE of the line indicates the speed

• horizontal line shows NO MOTION

• curves show ACCELERATION

• The x-axis is the ORIGIN

​IPC.5A position, velocity, acceleration, and time

Multiple Select

Which object(s) are accelerating?

• A

• B

• C

• D

• E

Multiple Choice

What is the speed of a runner who runs a distance of 75 meters in ​​​​​​​15 seconds?

• 0.2 m/s

• 0.5 m/s

• 5 m/s

• 20 m/s

Multiple Select

What is the speed pf the object in section A?

• 0 m/s

• 30 m/s

• 0.5m/s

• 2 m/s

Multiple Select

Which object(s) are NOT moving?

• A

• B

• C

• D

• E

Multiple Choice

When analyzing a graph, how would an object with a constant acceleration appear to move on a distance-time graph? 

• A curved line

• A diagonal line

• A horizontal line

• Can not be determined on a distance-time graph

REMEMBER!

Velocity graphs ARE NOT the same as distance time graphs!

​IPC.5A position, velocity, acceleration, and time

​IPC.5A position, velocity, acceleration, and time

​IPC.5A position, velocity, acceleration, and time

Multiple Choice

What is happening to the car between 3-8 seconds?

• The car is stopped

• The car is traveling at a constant velocity of 0.5 m/s.

• The car has an acceleration of 0.5 m/s².

• The car is going in the other direction.

Multiple Choice

The velocity-time graphs represent the motion of four different objects. Identify any object that is stationary or not moving. Check all that apply.

Multiple Choice

When the velocity of an object changes over time, this is known as –

• speed

• 1st law of motion

• acceleration

• force

Multiple Choice

Which section of the graph shows constant velocity?

• AB
• BC
• EF
• GH

Multiple Choice

While examining a velocity-time graph, you observe that the graph shows a horizontal line for a certain duration.

What does this suggest about the motion of the object?

• The object is accelerating at a constant rate.

• The object is at rest.

• The velocity is constant, and the acceleration is zero.

• The object is decelerating.

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Newton's Second Law of Motion

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​IPC.5B relationship between mass and acceleration in terms of the net force

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Balanced and Unbalanced Forces

Balanced Forces

• When balanced forces act on an object, the net force is zero.

• The forces are equal in size and act in opposite directions.

• There is no change in motion, meaning the object has zero acceleration.

Unbalanced Forces

• When unbalanced forces act on an object, the net force is not zero.

• These forces cause a change in the object's motion, called acceleration.

• The net force is found by combining all individual forces acting on it.

​IPC.5B relationship between mass and acceleration in terms of the net force

Effects of Forces on Moving Objects

​

Zero Net Force

• ​When the net force on an object is zero, it does not accelerate.

• ​​Its velocity stays constant, so it does not change its speed or direction.

• ​The object keeps moving at a steady pace and in a straight line.

​

Force in Same Direction

• ​A net force acts on the object in its direction of movement.

• ​​This unbalanced force causes the moving object to accelerate and speed up.

• ​The object’s velocity increases as long as this net force is applied.

​

Force in Opposite Direction

• ​A net force pushes against the object’s direction of current motion.

• ​​This causes the object to decelerate, which means that it slows down.

• ​Its velocity decreases, and it may eventually come to a complete stop.

Multiple Choice

What is the key difference in the net force between balanced and unbalanced forces?

• Balanced forces result in a net force of zero, while unbalanced forces result in a non-zero net force.

• Balanced forces are always in the same direction, while unbalanced forces are in opposite directions.

• Balanced forces only apply to objects at rest, while unbalanced forces apply to objects in motion.

• Balanced forces cause an object to accelerate, while unbalanced forces do not.

Multiple Choice

If an object is not accelerating, what must be true about the net force acting on it?

• The net force is equal to its weight.

• The net force is zero.

• The net force is equal to its mass.

• The net force is positive.

Multiple Choice

According to Newton's second law of motion, force is equal to –

• Mass x velocity

• Velocity x time

• Mass x acceleration

• Acceleration x velocity

Multiple Choice

What happens to the force acting on an object if the acceleration stays constant but mass doubles?

• it doubles

• it is halved

• it stays the same

• there is not enough information to determine what will happen to the force

Multiple Choice

A 20 kg bike accelerates at 10 m/s2.  what was the force

• 25 Newtons
• 20 Newtons
• 200 Newtons
• 10 Newtons

Multiple Choice

If a 10 kilogram object accelerates suddenly at 15 m/s^2, how much force was applied to the object?

• 150 Newtons
• 15 Newtons
• 150 kilograms
• 100 kilograms

Multiple Choice

What is the NET FORCE of this diagram?

• 17 N, right

• 17 N, left

• 23 N, right

• 12 N, up

​IPC.5C momentum and impulse

​IPC.5C momentum and impulse

Multiple Choice

The momentum of an object depends upon the object's ___________&_____________.  

• size and shape
• mass and speed
• mass and veloctiy
• mass and energy

Multiple Choice

A 0.250 kg cart moving at 0.400 m/s has how much momentum?

• 0.1 kg-m/s

• 1 kg-m/s

• 10 kg-m/s

• 100 kg-m/s

​IPC.5C momentum and impulse

Multiple Choice

The impulse is ______ the change in momentum

• greater than
• equal to
• less than
• always double

Multiple Choice

Impulse describes which of the following?

• How quickly a change in momentum occurs

• How quickly an object falls

• How quickly a change in mass occurs

• How quickly an object transfers heat

Multiple Choice

Airbags are used in cars to minimize momentum in a collision. This is because:

• This increases the time of impact so that the momentum is decreased.

• This decreases the time of impact so that the momentum is decreased.

• This increases the time of impact so that the momentum is increased.

• None of the above

Multiple Choice

The Law of Conservation of Momentum states:

• The total momentum before a collision is equal to the total momentum after a collision.

• The total momentum before a collision is greater than the total momentum after a collision.

• The total momentum before a collision is less than the total momentum after a collision.

• The total momentum before a collision is not related to the total momentum after a collision.

Multiple Select

Which of the following are ways to minimize the impulse of a collision?

Choose TWO correct answers.

• Provide more padding for the object

• Shorten the time interval during which the collision occurs

• Lengthen the time interval during which the collision occurs

• Make the object more rigid

• Increase the mass of the object