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level: Forces

Questions and Answers List

level questions: Forces

QuestionAnswer
A physical quantity that has only magnitude (size) and no direction.Scalar Quantity
What is a scalar quantity?A scalar quantity is a physical quantity that has only magnitude (size) and no direction.
A physical quantity that has both magnitude (size) and direction.Vector Quantity
What is a vector quantity?A vector quantity is a physical quantity that has both magnitude (size) and direction.
Energy, mass, length, speed, and density are examples of scalar quantities.Examples of Scalars
What are some examples of scalar quantities?Energy, mass, length, speed, and density are examples of scalar quantities.
Displacement, velocity, momentum, acceleration, and forces (e.g., weight, friction) are examples of vector quantities.Examples of Vectors
What are some examples of vector quantities?Displacement, velocity, momentum, acceleration, and forces (e.g., weight, friction) are examples of vector quantities.
Vectors can be represented with arrows, where the length of the arrow shows the magnitude, and the direction shows the direction of the vector.Vector Representation
How are vectors represented?Vectors can be represented with arrows, where the length of the arrow shows the magnitude, and the direction shows the direction of the vector.
A diagram that represents the direction and magnitude of forces acting on an object, often depicting the object as a point or a box.Free Body Diagram
What is a free body diagram?A free body diagram is a diagram that represents the direction and magnitude of forces acting on an object, often depicting the object as a point or a box.
In a free body diagram, the object is typically shown as a point or a box.Object Representation
How is the object represented in a free body diagram?In a free body diagram, the object is typically shown as a point or a box.
Arrows in a free body diagram represent forces, showing their direction and relative magnitude.Arrow Representation
What do arrows represent in a free body diagram?Arrows in a free body diagram represent forces, showing their direction and relative magnitude.
The combined effect of all the forces acting on an object, often denoted as the vector sum of the individual forces.Resultant Force
What is a resultant force?The resultant force is the combined effect of all the forces acting on an object, often denoted as the vector sum of the individual forces.
When all the forces in a free body diagram cancel each other out or balance, the object has a zero resultant force.Zero Resultant Force
What does a zero resultant force indicate in a free body diagram?A zero resultant force indicates that all the forces in a free body diagram cancel each other out or balance, meaning the object has a zero resultant force.
Forces often included in a free body diagram are the normal contact force, weight, friction, upthrust, and drag or air resistance.Forces Included in Free Body Diagrams
What are some forces commonly included in free body diagrams?Forces often included in a free body diagram are the normal contact force, weight, friction, upthrust, and drag or air resistance.
Several forces acting on an object can be replaced by one resultant force, having the same effect as the combined forces.Combined Forces
How can several forces acting on an object be replaced?Several forces acting on an object can be replaced by one resultant force, having the same effect as the combined forces.
If combined forces act in the same direction, you add them together; if they act in opposite directions, you subtract them.Direction of Forces
How do you determine the direction of the resultant force?If combined forces act in the same direction, you add them together; if they act in opposite directions, you subtract them.
A single force at an angle can be separated into two forces at right angles to each other, having the same effect as the single force.Forces at an Angle
What can be done with a single force at an angle?A single force at an angle can be separated into two forces at right angles to each other, having the same effect as the single force.
You can use a scale diagram to find the resultant force on an objectStep 1: Measure the length of one force arrow.
You can use a scale diagram to find the resultant force on an objectStep 2: Draw a new force arrow parallel to the measured force.
You can use a scale diagram to find the resultant force on an objectStep 3: Repeat for the other force arrow to make a parallelogram.
You can use a scale diagram to find the resultant force on an objectStep 4: Measure the length of the diagonal of the parallelogram.
You can use a scale diagram to find the resultant force on an objectStep 5: Calculate the scale factor by dividing one of the forces by the length of its arrow.
You can use a scale diagram to find the resultant force on an objectStep 6: Multiply the length of the diagonal by the scale factor to find the resultant force.
In this example, the resultant force is 24° away from the 30 N force.Step 7: Find the direction of the resultant force using a protractor.
When the forces acting on an object are balanced, resulting in zero resultant force, the object is in equilibrium.Equilibrium
What does it mean when forces acting on an object are balanced?When forces acting on an object are balanced, resulting in zero resultant force, the object is in equilibrium.
Forces that produce zero resultant force and keep an object in equilibrium.Balanced Forces
What do "balanced forces" mean for an object?"Balanced forces" mean an object is in equilibrium, not accelerating or decelerating.
Forces that produce a nonzero resultant force, causing an object to accelerate or decelerate.Unbalanced Forces
What happens when forces acting on an object are unbalanced?An unbalanced force causes acceleration or deceleration and indicates that the object is not in equilibrium.