Forces in Equlibrium

The force exerted by a table perpendicular to its surface upon a book resting on the table is called the ____ force.
1. normal
2. scalar
3. vector
4. component
The force required to overcome static friction is ____ the force to overcome sliding friction.
1. less than
2. more than
3. equal to
A word meaning “size”often used to describe scalar quantities is ____.
1. magma
2. magenta
3. vector
4. magnitude
A measured quantity that is described by stating a size and a direction is called a ____.
1. scalar
2. magnitude
3. vector
4. victim
Vector quantities include all of the following EXCEPT ____.
1. velocity
2. force
3. speed
4. acceleration
A scalar is a quantity that can be completely described using ____.
1. direction only
2. magnitude only
3. both magnitude and direction
4. either magnitude or direction
Jade pulls on a wagon with 6 newtons of force toward north. Lara pulls on the wagon with 8 newtons of force toward east. The magnitude of the wagon’s resultant force is ____ newton(s). Hint: (3,4,5) is a Pythagorean triple.
1. 2
2. 10
3. 14
4. 48
Forces in a diagram are represented by the following scale: 1 centimeter equals 4 newtons. To represent a force of 20 newtons, the length of an arrow drawn to represent the force should be ____ centimeter(s).
1. 1
2. 4
3. 5
4. 20
The diagram represents a force acting at the star. Which pair of forces could represent x and y components of this force?
1. Mario (top left)
2. Luigi (bottom right)
3. Bowser (top right)
4. Princess Peach (bottom left)
The relationship between a spring’s change in length and the force it exerts is called ____.
1. Newton’s law
2. Hooke’s law
3. Archimedes’ principle
4. Galileo’s theory
When a spring is compressed ____.
1. the potential energy stored in the spring increases
2. the potential energy stored in the spring decreases
3. the spring constant of the spring is decreased
4. the spring constant of the spring is increased
When the net force acting on an object is zero, this ALWAYS causes a condition of motion referred to as ____.
1. rest
2. negative acceleration
3. positive acceleration
4. equilibrium
When you are seated in a chair, the force exerted on you by the chair is called the ____.
1. normal force
2. gravitational force
3. weight
4. mass
A dictionary whose mass is 2.0 kilograms lying on a stationary table exerts a force of 19.6 newtons on the table. The force exerted on the dictionary by the table is ____ newtons.
1. 2.0
2. 9.8
3. 19.6
4. 17.6
A car drives from east to west over a bridge supported by the ground at either end as illustrated in the diagram. The force exerted by the ground on the bridge at the west end is ____ tons.
1. 25
2. 30
3. 40
4. 80
Jin is pedaling his bicycle due west on the Mohawk River bicycle path at a constant speed of 17 miles per hour. As he is pedaling, a 3 mile per hour wind is blowing from the east. The statement that best describes the forces acting on Jin’s bicycle is that ____.
1. the net force acting on the bike is zero
2. a greater net force is acting toward the east
3. a greater net force is acting toward the west
4. Not enough information is given to answer the question
A force of 6 newtons is required to stretch a spring 4 centimeters. The amount of force required to stretch the same spring 8 centimeters is ____ newton(s).
1. 4
2. 6
3. 8
4. 12
If the stretching force on a spring is doubled, the length of the spring will be ____.
1. unchanged
2. doubled
3. quadrupled
4. halved
A spring with a large spring constant stretches ____.
1. a large amount with a small force
2. a small distance with a large force
The force that resists the motion of objects or surfaces in contact with one another is called ____ force.
1. inertial
2. frictional
3. normal
4. net
The force of friction between two surfaces can be reduced by all of the following EXCEPT ____.
1. separating surfaces with a lubricant
2. separating surfaces with a layer of air
3. increasing the surface roughness
4. sanding rough surfaces smoother
To overcome static friction to start an object sliding on a level surface, a 20-newton force is used. The magnitude of the force needed to keep the object the sliding is ____.
1. more than 20 newtons
2. equal to 20 newtons
3. less than 20 newtons
4. unknown using the given information
As Joshua accelerates in his pickup truck at 2.0m/sec^2, a 100-kilogram box in the back does not slide. The force of friction that must act on the box to keep it from slipping in the back of the truck is ____ newtons. Hint: F=ma
1. 100
2. 200
3. 400
4. 1,960
The diagram represents a box sliding down an incline. The arrow represent the direction of motion of the box. The force of friction acting on the box is directed toward ____.
1. Mario (upper left)
2. Bowser (upper right)
3. Luigi (lower right)
4. Princess Peach (lower left)
Bowser and Princess Peach are able to balance when seated on a see-saw. Bowser weighs 800 newtons and sits 2.0 meters from the balance point. Princess Peach weighs 400 newtons. To create rotational equilibrium, the distance she must sit from the balance point is ____ meter(s).
1. 1.0
2. 2.0
3. 4.0
4. 8.0
Which of the following is a physical quantity that has a magnitude but no direction?
1. vector
2. scalar
Which of the following is a physical quantity that has both magnitude and direction?
1. vector
2. scalar
Identify the following quantities as scalar or vector: the mass of an object; the number of leaves on a tree; wind velocity.
1. vector; scalar; scalar
2. scalar; scalar; vector
3. scalar; vector; scalar
4. vector; scalar; vector
Identify the following quantities as scalar or vector: the speed of a snail; the time it takes to run a mile; the free-fall acceleration.
1. vector; scalar; scalar
2. scalar; scalar; vector
3. vector; scalar; vector
4. scalar; vector; vector
Which of the following is an example of a vector quantity?
1. velocity
2. temperature
3. volume
4. mass
Which has zero acceleration? An object ____.
1. in mechanical equilibrium
2. moving at constant velocity
3. at rest
4. all of these
A force is a vector quantity because it has both ____.
1. mass and acceleration
2. magnitude and direction
3. action and reaction counterparts
4. size and magnitude
A fluid such as oil used to reduce friction is called a ____.
1. lubricant
2. vector
3. scaler
4. magnitude
The sum of two or more vectors is called the ____.
1. resultant
2. component
When the net force that acts on a body is zero, the forces are balanced. This represents a condition called ____.
1. equilibrium
2. momentum
3. rotational torque
4. sleeping
A diagram that uses vectors to show all of the forces acting on an object is known as a ____ diagram.
1. free-body
2. venn
3. H-R
4. arrow plot
The opposing force that resists an object’s motion when two surfaces come in contact is called ____.
1. friction
2. the normal
3. net force
4. the dark force
The force pushing upward, perpendicular to the surface on which an object rests is called ____ .
1. friction
2. the normal force
3. net force
4. the dark force

Forces in Equlibrium

Review Questions