Unit 03 Review: Forces and Newton's Laws
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Physics
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9th Grade
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Practice Problem
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Medium
Standards-aligned
g Custer
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3 Slides • 19 Questions
1
Forces and Newton's Laws
2
Mass and Weight are NOT the same! Weight depends on Mass.
Weight is the downward force of gravity pulling on an object.
Friction is a contact force that resists motion. It depends on the surfaces' material and the force pushing them together.
The coefficient of friction determines how "sticky" a surface is.
Higher = "Grippy" & Lower = "Slippy"
3
Multiple Choice
What is mass?
How much MATTER makes up an object.
How much GRAVITY is pulling an object.
4
Multiple Choice
If an object mass is 30 Kg on the Earth, what would be it's weight? Assume Earth's gravity acceleration is 10 m/s2
30 N
.3 N
300 N
30 kg
5
Multiple Select
Select all that apply.
Mass is...
the quantity of matter in an object.
a measure of an object's inertia.
the same in different locations
equal to the weight of an object.
6
Multiple Choice
What would happen to your weight if Earth's mass was cut in half?
increase because gravitational force increases
decrease because gravitational force decreases
decrease because gravitational force increases
increase because gravitational force decreases
7
Multiple Choice
Compared to your weight and mass on Earth, if you were on the moon:
your weight and mass would be less.
your weight would be less but your mass would remain the same.
your weight would remain the same, but your mass would be less.
your weight would be greater, but your mass would remain the same.
8
Multiple Choice
A force that results from two objects rubbing past each other.
Gravity
Friction
Normal Force
Acceleration
9
Multiple Select
What are two factors that determine the amount of friction between objects? Select both.
Force pressing them together
Surface roughness
Mass
Contact Area
10
Multiple Choice
Which would NOT be a way of reducing friction?
Making the surfaces smoother
Changing from sliding friction to rolling friction
Using lubricants such as waxes, oils, or grease
Using kitty litter on snow and ice to help your car gain traction
11
Poll
How confident do you feel about the material we just reviewed?
Very confident. I am ready for the assessment!
I understand most of it, but there are some things I need to study.
Neutral. I understand some of it, but I need to review quite a bit.
Overall, I am more confused than confident. I need to review a lot more.
I am totally lost. I do not understand any of this material.
12
1st: An object will not change its motion unless acted on by an unbalanced force.
2nd: The acceleration of an object is directly proportional to the applied force.
3rd: When one object exerts a force on another, the second object exerts an equal and opposite force in return.
13
Multiple Choice
The tendency of an object to resist being moved or if in motion, being stopped is...
inertia
friction
force
weight
14
Multiple Choice
The unbalanced force acting on an object equals the object's mass times its acceleration is which law?
1st
2nd
3rd
None of These
15
Multiple Choice
As the acceleration of an object increases, what happens to the force of the object?
Force increases
Force decreases
Force stays the same
16
Multiple Choice
Will it take more force to push an empty shopping cart or a shopping cart that is full?
Empty Cart
Full Cart
They will require equal force.
17
Multiple Choice
When a heavy football player and a light one run into each other, who exerts more force?
Light Player
Heavy Player
They exert equal forces.
18
Multiple Choice
For every action there is an equal and opposite reaction.
Every mass exerts a force on every other mass.
An object at rest tends to stay at rest.
Friction opposes the motion of an object.
19
Multiple Choice
remain in motion.
eventually come to a stop.
change its momentum.
accelerate.
20
Multiple Choice
Pushing a child on a swing is easier than pushing an adult on the same swing, because the adult has more mass.
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
None of them
21
Multiple Choice
22
Poll
How confident do you feel about the material we just reviewed?
Very confident. I am ready for the assessment!
I understand most of it, but there are some things I need to study.
Neutral. I understand some of it, but I need to review quite a bit.
Overall, I am more confused than confident. I need to review a lot more.
I am totally lost. I do not understand any of this material.
Forces and Newton's Laws
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