Name the Force
What force pulls objects toward Earth?
Gravitational force (weight)
How many forces act on a book resting on a table?
Two
If the net force on an object is zero, what happens to its motion?
It remains at rest or moves at constant velocity
Which law explains inertia?
Newton’s First Law
True or False: A force is needed to keep an object moving at constant speed
False
What force prevents an object from falling through a surface?
Normal force
In a free-body diagram, which force always points downward?
Weight or gravity
Can an object be moving if the net force is zero?
Yes
Which law explains why heavier objects require more force to change motion?
Newton’s Second Law
True or False: Friction always slows an object down.
False
What force opposes relative motion between two surfaces in contact?
Friction
When an object moves at constant velocity, what is true about the net force?
The net force is zero
When an object moves in a circle at constant speed, what changes?
Direction of velocity
Which law explains action–reaction force pairs?
Newton’s Third Law
: Is weight a force or a property of matter?
A force
What force acts on an object connected to a rope or string?
Tension
A car turns left on a flat road. Which force provides the centripetal force?
Static friction
If friction increases, how does it affect the motion of an object?
It reduces motion or slows the object down
Why don’t action–reaction forces cancel each other?
They act on different objects
Is centripetal force a new type of force, or is it the result of existing forces?
It is not a new type of force; it is the result of existing forces acting toward the center of a circular path.
What force acts toward the center of a circular path?
Centripetal force
In a free-body diagram, do action–reaction force pairs appear on the same object?
No
When a force causes circular motion, does it act parallel or perpendicular to the velocity?
Perpendicular
Why does a passenger lurch forward when a car stops suddenly?
Inertia
Does centripetal force change speed or direction?
Direction