Type of Force
This force pulls an object towards the center of the Earth
Gravity
A car exerts 100 N of force, a truck exerts 200 N of force. Is it balanced?
Unbalanced, net force of 100 N
A marble is exerting 1 N of force on a track, there is a left turn in the track exerting 2 N of force on the marble. Where will the marble turn?
Left, 1 N is an unbalanced force
An object is motion will stay in motion unless acted upon, an object at rest will stay at rest unless acted upon
Newton's first law of motion
The force of an object that is 4kg, and accelerates at 2m/s2
8N
This force relates to the resistance between two surfaces that are in contact with each other.
Friction
A tree exerts a normal force of 500N, a child sledding exerts a force of 10 N. Is it balanced?
Unbalanced, 490N
Lebron James throws a ball in the air with 25 N of force, gravity exerts 5 N of force on the ball. What direction will the ball go?
Up, 20 N is an unbalanced force
The force of an object is equal to its mass times acceleration
Newton's second law
An 10 kg object accelerates at 5m/s2
50 N
This force relates to the stretching of an object.
Tension
The chair exerts a normal force of 20N, Mrs. Miller exerts a force of 20N on the chair.
Balanced, 0 N
A bike weighing 5 kg and accelerating at 2 m/s2 hits a tree exerting 10 N of normal force. What will happen?
The bike crashes into the tree, and nothing moves. 0 N force is balanced. No movement
For every action, there is an equal and opposite reaction
Newton's third law
The acceleration of an object exerting a force of 100N that is 4 kg
25 m/s2
This is the force that describes something be stretched or compressed, and then returning to its own form after release
Spring
Unbalanced, 10 N
A bicyclist is riding west, applying a force of 100 N forward and experiencing 15 N of air resistance. What direction is the bicyclist riding?
Forward, 85 N is unbalanced.
Predict what will happen using Newton's 3rd law of motion: you release the air from a balloon and let go
The balloon goes flying, for every action (releasing the air) there is an equal and opposite reaction (the balloon goes flying)
The mass of a block that exerts a force of 25 N and accelerates at 5 m/s2
4 kg
This is the force that objects exert to prevent them from passing through each other (it comes from bonds)
Normal
Tom and Jerry are exerting an applied force of 50 N on a refrigerator, the refrigerator is exerting a normal force of 50 N on Tom and Jerry.
Balanced, 0 N
Tom Brady throws a baseball toward the basket with a force of 10 N, but there was 15 N of wind blowing the opposite direction. What direction does the ball go?
Toward Tom Brady, 5 N is unbalanced
Use Newton's first law of motion to predict what will happen: Teddy is sliding down a hill on his brand new sled, there is nothing at the bottom of the hill, but it does plane out
Teddy will continue to slide down the hill until the normal force of the bottom of the hill acts on his sled and he comes to a stop. Gravity is pushing down on the sled the whole time, but the net force of the gravity is smaller than the net force of friction when the sled is no longer going downhill
A car is exerting a force of 1000N, with a mass of 2500kg is accelerating at what speed?
0.40 m/s2