Forces
What is a force?
A) A push or pull on an object
B) The speed of an object
C) The temperature of an object
D) The color of an object
Answer: A) A push or pull on an object
Which of the following scenarios best illustrates balanced forces?
A) A car accelerating down a hill
B) A box resting on a flat table
C) A ball rolling on the ground
D) A person sprinting down the street
Answer: B) A box resting on a flat table
Which of the following scenarios demonstrates unbalanced forces?
A) A parked car in a garage
B) An apple falling from a tree
C) A person reading a book
D) A cup sitting on a table
Answer: B) An apple falling from a tree
What does a free-body diagram primarily illustrate?
A) The motion of an object
B) The forces acting on an object
C) The energy transformations in a system
D) The shape of an object
Answer: B) The forces acting on an object
If a box is being pushed to the right with a force of 10 N and friction acts to the left with a force of 4 N, what is the net force acting on the box?
A) 6 N to the right
B) 10 N to the left
C) 14 N to the right
D) 4 N to the right
Answer: A) 6 N to the right
Which of the following is a unit of force?
A) Kilogram
B) Meter
C) Newton
D) Joule
Answer: C) Newton
What happens to an object at rest when the forces acting on it are balanced?
A) It starts moving
B) It remains at rest
C) It accelerates
D) It falls
Answer: B) It remains at rest
What occurs when an unbalanced force acts on an object?
A) The object remains at rest
B) The object changes its state of motion
C) The object moves in a straight line indefinitely
D) The object's speed decreases
Answer: B) The object changes its state of motion
In a free-body diagram, which of the following represents the force of gravity acting on an object?
A) A dashed line pointing upwards
B) An arrow pointing downwards
C) A solid circle
D) An arrow pointing sideways
Answer: B) An arrow pointing downwards
If a car accelerates forward due to an applied force of 500 N while experiencing a frictional force of 200 N opposing its motion, what is the net force acting on the car?
A) 300 N forward
B) 700 N forward
C) 200 N backward
D) 500 N backward
Answer: A) 300 N forward
Which of the following forces is not a contact force?
A) Tension
B) Friction
C) Gravitational force
D) Normal force
Answer: C) Gravitational force
If a man is standing still, what can we conclude about the forces acting on him?
A) The net force is zero
B) He is accelerating upwards
C) He is moving sideways
D) The net force is positive
Answer: A) The net force is zero
If you drop a pencil from your desk, what type of forces are acting on it as it falls?
A) Balanced forces
B) Unbalanced forces
C) No forces at all
D) Only gravitational force
Answer: B) Unbalanced forces
If a free-body diagram shows two arrows of equal length pointing in opposite directions, what can be inferred about the forces?
A) They are unbalanced forces.
B) They are balanced forces.
C) One force is greater than the other.
D) There is no force acting on the object.
Answer: B) They are balanced forces.
A mass of 15 kg hangs from a rope. What is the tension in the rope if the system is at rest?
A) 75 N
B) 147 N
C) 180 N
D) 200 N
Answer: B) 147 N
FT Tension= Fw Weight=(15 kg)(9.8 m/s2)=147 N
How can you increase the frictional force between two surfaces?
A) Decrease the weight on the surfaces
B) Smooth out the surfaces
C) Increase the weight on the surfaces
D) Increase the distance between them
Answer: C) Increase the weight on the surfaces
What happens to an object if all the forces acting upon it are balanced?
A. It will accelerate.
B. It will remain stationary or move with constant velocity.
C. It will fall.
D. It will change direction.
Answer: B. It will remain stationary or move with constant velocity.
In which situation would you expect to see unbalanced forces at work?
A. An ice cube melting in warm water.
B. An airplane cruising at high altitude.
C. A roller coaster going down a steep drop.
D. A statue standing still in a park.
Answer: C. A roller coaster going down a steep drop.
In a free-body diagram, which force is typically represented by an upward arrow when an object is in free fall?
A) Normal force
B) Frictional force
C) Gravitational force
D) Air resistance
Answer: D) Air resistance
If an object has multiple forces acting on it (10 N right, 5 N left, and 3 N up), what is the resultant horizontal (x) force?
A) 5 N right
B) 8 N right
C) 10 N left
D) 18 N left
Answer: A) 5 N right
If two people are pulling on opposite ends of a rope with equal force, what is the net force acting on the rope?
A) 0 N
B) 100 N towards one person
C) 200 N towards one person
D) It depends on the strength of the rope
Answer: A) 0 N
Which statement about balanced and unbalanced forces is true?
A) All objects in motion have unbalanced forces acting on them.
B) Balanced forces can cause an object to move.
C) Unbalanced forces can change the motion of an object.
D) Balanced forces always result in acceleration.
Answer: C) Unbalanced forces can change the motion of an object.
If two equal-sized boxes are pushed with different amounts of force, what can be concluded about their movement?
A. Both boxes will move at the same speed.
B. The box with more force will accelerate faster than the other box.
C. Both boxes will not move at all.
D. Both boxes will fall over due to gravity.
Answer: B. The box with more force will accelerate faster than the other box.
If an object is being pulled to the right with a force of 10 N and pushed to the left with a force of 5 N, how should this be represented in a free-body diagram?
A) Two arrows of equal length in opposite directions
B) One arrow to the right (10 N), one to the left (5 N), with a resultant arrow to the right (5 N).
C) One arrow only to the left (5 N).
D) One arrow only to the right (10 N).
Answer: B) One arrow to the right (10 N), one to the left (5 N), with a resultant arrow to the right (5 N).
If a person pulls a sled with a force of 50 N to the right while friction exerts a force of 30 N to the left, what is the sled's acceleration if its mass is 10 kg?
A) 2 m/s² to the right
B) 3 m/s² to the left
C) 5 m/s² to the right
D) 5 m/s² to the left
Answer: A) 2 m/s² to the right