Net Force
Calculate the Net Force applied to the box. One person is pushing a box with 6N to the right and another person pulling the box with 4N to the right.
10N
Are the forces balanced or unbalanced if the Net force is 0N?
Balanced
Contact or Noncontact: A horse pulling a buggy
Contact
Which variables stay the same in each trial? (independent, dependent, or control)
Control variables
If the following objects are all at rest on the same frictional surface, which object will require the most force to push?
A classroom chair
A refrigerator
A box of stuffed animals
A refrigerator
Calculate the Net Force applied to the box. One person is pushing a box with 9N to the right and another person pushing the box with 7N to the left.
2N
Are the forces balanced or unbalanced if the Net force is 12N?
Unbalanced
Contact or Noncontact: One magnet pushing another magnet away.
Noncontact
When investigating how amount of vinegar affects the height of a rocket, which factor is the independent variable?
Amount of vinegar
The following boxes are the same size but have different masses. They are all at rest on the same frictional surface and need to be pushed across the surface. List the objects in order from least force applied to most force applied.
Box A: 20kg
Box B: 75kg
Box C: 50kg
Box D: 100kg
A, C, B, D
Calculate the Net Force applied to the box and determine the direction the box is moving. One person is pulling a box with 27N to the left and another person pulling the box with 14N to the right.
13N left
True or False: Balanced forces do not affect an object's motion.
True
Examples: Give an example of a contact force
Two objects in physical contact with each other and exerting a force on each other.
You are conducting an experiment to determine how the amount of light a plant receives affects how tall it grows. Identify the independent, dependent, and 2 control variables for the experiment.
Independent: Amount of light
Dependent: Plant height
Controls: Amount of water, type of plant, soil, etc.
Use the formula F=ma to calculate the Net Force.
Mass: 25kg
Acceleration: 2.0 m/s2
50N
Calculate the Net Force applied to the box and determine the direction the box is moving. One person is pulling a box with 5N to the left, another person is pulling the box with 6N to the left, and a third person pulling the box with 14N to the right.
3N right
Determine whether the following scenarios are unbalanced, or balanced forces.
Student Sitting at Desk, Rocket Taking Off, Building Collapsing, Boy pushing on a wall
Balanced: Student Sitting at Desk and Boy pushing on a wall
Unbalanced: Rocket Taking Off and Building Collapsing
Example: Give an example of a noncontact force
Gravity, magnetism, and electrostatic force
You are investigating how much soap to use when creating the biggest bubbles. Identify the independent, dependent, and 2 control variables for the experiment.
Independent: Amount of soap
Dependent: Bubble size
Controls: Type of soap, amount of water, bubble wand, amount of air, etc.
Use the formula F=ma to calculate the Net Force.
Mass: 25kg
Acceleration: 3.0 m/s2
75N
Draw the illustration, calculate the Net Force applied to the box, and determine the direction the box is moving. One person is pulling a box with 8N to the right, another person is pulling the box with 12N to the left, and a third person pulling the box with 6N to the right.
2N right
Draw an example of a balanced force and of an unbalanced force. Include labels for the strength and direction of forces.
Balanced: Arrows are equal in length and opposite in direction and net force =0.
Unbalanced: Arrows are unequal in length or in the same direction and net force is not zero.
Contact or noncontact: The wind blowing leaves off of a tree.
Contact force, air molecules are in contact with the leaves.
Create a research question. Then, identify the independent, dependent, and control variables for your experiment.
How __IV____ affects ____DV___
IV: Changed by the scientist
DV: Measured as a result
CV: Stays the same (not part of the research question)
Use the formula F=ma to calculate the mass of an object with a constant acceleration of 3.0m/s2 and a Net Force of 150N.
50kg