Vocabulary
General Concepts
Graphs, Tables, and Free Body Diagrams
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
100
Define balanced forces
Forces on an object with a net force of zero
100
Does the gravitational force increase or decrease as two objects move farther apart?
It decreases.
100
What is the net force on the box?
7 N
100
An object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an ___________ force.
Unbalanced
100
As the net force acting on an object increases, the object's acceleration will (choose one: increase or decrease).
Increase
100
Every action has an equal, but __________ reaction.
Opposite
200
______________________________ measures an object’s tendency to resist changing its motion.
Inertia
200
A box sits on a counter top and doesn't move. As gravity pulls it down, the force of the table is (choose one: equal to, less than, or greater than) the force of gravity.
Equal to
200
According to the trend in these data, which of the following values is most likely the speed of the object after falling for 6 s?
Approximately 20.1 m/s
200
You roll a ball across the floor, but it eventually comes to a stop. Why?
The force of friction between the ball and the floor was greater than the force that pushed the ball
200
If a 14kg box has a net force of 28N acting on it, what is the box's acceleration?
2 m/s2
200
We all know the earth and the moon exert an attractive force on each other. The force of the earth on the moon is (choose one: less than, greater than, equal to) the force of the moon on the earth
Equal to
300
The _______________________________ is the combination of all the forces acting on an object.
Net force
300
A box sits on a countertop and doesn't move. As gravity pulls the box down, the countertop pushes back up on the box. The force of the countertop on the box is called ______________ force.
Normal
300
If all objects fell from the same height, which one had the LOWEST average speed?
Object A because it took the most amount of time to fall
300
Object A and object B have the same mass, but object B is traveling with a greater velocity. Which object has more inertia?
Object B
300
You're pulling a wagon with rocks in it. You suddenly hit a bump and some of the rocks fall out. Because you have less mass and you're applying the same amount of force onto the wagon, the wagon's acceleration will (choose one: increase or decrease)
Increase because mass and acceleration are inversely proportional (as one goes increases, the other decreases)
300
Paired forces that are equal in magnitude but opposite in direction are called...
Reaction pairs
400
A(n) ___________________________ is a push or a pull that one body exerts on another.
Force
400
A crate sits on a rough floor. A person pushes on the crate with a small horizontal force, but the crate does not move. That is because the crate is in equilibrium because the applied force (FA) is exactly balanced by static friction and the net force is ________.
Zero
400
At which segments on the graph are the forces on the car UNBALANCED?
Segments A, C, and E
400
If a car is travelling at a constant velocity down a road, the forces acting on the car are __________ .
Balanced; 0 net force
400
Look at the graph. At which segment is the net force acting on the object the GREATEST?
Segment A
400
As a rocket engine exerts a force downward, the reaction of the rocket is to travel...
Upward
500
What is the name of the force that resists an object's motion?
Friction
500
Car tires are made with tread rather than being smooth. This is to increase the amount of ____________ between the tires and the road.
Friction
500
If this box has a mass of 14kg, what is its acceleration?
F = m x a -> a = F/m
0.5 m/s2
500
Object A and object B are dropped from the same height, but object A reaches the ground first. Why?
The force of air resistance was less on object A than it was object B
500
An object in free fall will eventually reach terminal velocity. This is where gravity and air resistance are equal and opposite of each other and the net force acting on the falling object is _____ .
Zero; balanced
500
A book is sitting on a desk and due to gravity pulling it down, exerts a downward force of 9.8 N onto the desk. What is the magnitude and direction of the reactionary force of the desk onto the book?
9.8 N upward