Download Name:______KEY_ Quiz Study Guide Topics included on this quiz

Name:_______KEY___________________
Quiz Study Guide
Topics included on this quiz are based from the following:
Acceleration Notes, Act. 78 (F=m*a), Motion Notes (change in motion and force diagrams), Act. 81 (force
diagrams), Act. 79 (inertia), Act. 80 (Newton’s Laws), Newton’s Laws Notes
Activity #78-Force, Acceleration, and Mass / Acceleration Notes
1.) Complete the following table
Work Bank: Kg m/s2 m/s
Newton
Term
Force
Mass
Acceleration
Velocity
Unit
N
kg
m/s²
m/s (+ direction)
2.) What is the equation for force?
___F = m x a__________
**Make sure you KNOW this equation. It is
one of Newton’s Laws and may not be
given to you on the quiz.
3.) What 3-4 types of motion indicate that an acceleration is occurring?
Speeding up, slowing down, starting/stopping, changing direction
4.) Acceleration is how fast something changes _____velocity________.
5.) A force is a ______push_______ or a _______pull______ that changes an object’s motion.
Activity #81-The Net Force Challenge / Force Diagram Notes
1.) If a car is parked and not moving, then the forces acting on the car must be
a.) balanced
b.) unbalanced c.) both
2.) If a car is traveling at a constant speed in a straight line, then the forces acting on the
car must be
a.) balanced
b.) unbalanced c.) both
3.) If a car is accelerating, then the forces acting on the car must be
a.) balanced
b.) unbalanced c.) both
4.) How can you tell if the forces acting on an object are balanced or unbalanced?
Possible answers:
 Unbalanced forces will result in a non-net zero force diagram
 Unbalanced forces result in a change in motion
 Something that is accelerating is experiencing unbalanced forces
Use the following information for questions #5-8
Enrique and Lisette the groundhogs are both fighting over their favorite toy (a small tree branch).
Enrique pulls on the branch towards the left with a force of 12 Newtons and Lisette pulls on the
branch with a force of 18 Newtons to the right.
5.) Draw a force diagram that shows all the forces acting on the branch.
12N
18 N
6.) Draw a “Net Force Diagram” that only shows the “Net Force” on the branch.
6N
7.) Would the branch be accelerating? ___yes___Changing its motion?____yes______
8.) Would the branch have a zero net force or non-zero net force?
Non-zero net force
Activity #79-Inertia Around a Curve
1.) Define Inertia
The tendency of an object to resist changes in its motion
2.) DESCRIBE what inertia is by using YOUR OWN WORDS. (This is a good test to see if you
understand what inertia really is.)
Objects like to keep doing what they are already doing, they are “lazy,” etc.
3.) Which groundhog has more inertia? Explain why or how you know.
Enrique, who weighs 10 pounds and is running at a speed of 5 m/s or
Lisette, who weighs 13 pounds and is sleeping on the sidewalk.
Lisette because she has more mass and thus more resistance to change
4.) What is required to change an object’s motion? A force
5.) What did the circular track apply to the ball to change its motion and keep it in a
circular path? A force
6.) Why did the ball go straight out of the circular track when it reached the opening? Why
did it not continue in a circle?
It no longer had the force of the track pushing it in, so it followed
its inertia and went in a straight line.
Activity #80-Newton’s Laws of Motion
Give a brief explanation of Newton’s Laws:
First- Law of Inerita – an object in motion will stay in motion and and object at rest will
stay at rest unless acted on by an unbalanced force
Second- Force=mass x acceleration (an object with a larger mass will take more force to accelerate)
Third- All forces act in pairs. For every action there is an equal and opposite reaction.
1.) True or False- EXPLAIN- A force is required to keep an object in motion.
False, an object in motion will stay in motion unless acted on by an
unbalanced force.
2.) True or False- EXPLAIN - The lighter the object, the more force needed to stop it.
False, the lighter the object, the less inertia, therefore the less
resistance to a change in motion (stopping)
3.) Label and describe the action force and reaction forces in the
picture below
Action Force- ___ Ball applying a force to the pin
Reaction Force -Pin applying a force back to the ball
4.) In the example above why does the pin move backward and the ball continues to move
forward if both are experiencing equal forces?
The pin has much less mass. Because the ball’s mass is much greater, it overcomes the force
5.) If a rocket applies a force of 90,000 Newtons on the ground, roughly what force does
the ground apply back on the rocket since the rocket is moving and the ground is not?
90,000 Newtons
6.) Which of Newton’s 3 Laws explain the following scenarios?
a.) A magician pulls a tablecloth out from under dishes and glasses on a table
without disturbing them. First- inertia
b.) Rockets are launched into space using jet propulsion where exhaust accelerates
out from the rocket and the rocket accelerates in an opposite direction. Third
c.) Pushing a child on a swing is easier than pushing an adult on the same swing,
because the adult has more inertia. Second – f=ma
d.) A student leaves a pencil on a desk and the pencil stays in the same spot until
another student picks it up. First - inertia
Overall Motion- The following questions relate to multiple activities.
1.) Which has more of a change in motion? Explain why.
A car speeding up from 15m/s to 30 m/s or
A car slowing from 25m/s to 5m/s.
A car slowing from 25m/s to 5m/s.
Because it has a “change in speed” of 20m/s where the first car has a change in speed of
15m/s. A “change in speed” (speeding up or slowing down) is a change in motion
2.) Explain how objects on earth do not “violate” Newton’s Law of Inertia? Why don’t
objects in motion stay in motion on earth? (Hint: What forces are acting on them?)
Objects do not stay in motion because they are acted on by the forces
of gravity and friction.
3.) If you apply 25 Newtons of force down onto your chair, about how many Newtons of
force does your chair apply back to you, and in what direction?
25 Newtons in the upward direction
4.) A car is going around a circular track at a constant 15m/s.
Is the car experiencing an acceleration? Explain.
Yes, since it is changing velocity, it must be accelerating. The
definition of acceleration is anything that is changing velocity
5.) Something experiencing a BALANCED force is also experiencing a… (circle all that apply)
a.) An acceleration b.) change in velocity c.) change in motion d.) constant speed
6.) Something experiencing a UNBALANCED force is also experiencing a: (circle all that apply)
a.) An acceleration b.) change in velocity c.) change in motion d.) constant speed
7.) Are the following objects experiencing a change in motion?
a.) An orange falling at terminal velocity. NO
b.) The moon orbiting the Earth. YES
c.) A person riding a horse on a carousel. YES
d.)A roadrunner travelling a constant 20 km/hr straight through a desert. NO
8.) True/false and explain- Is an object falling at terminal velocity accelerating?
False, an object could be moving at a constant speed which does not
represent a change in motion.