Forces & Net Force
What is a force?
A push or pull.
Which law explains why objects keep moving unless acted on by a force?
Newton’s First Law.
What type of energy is energy of motion?
Kinetic energy.
On a distance–time graph, what does a horizontal line mean?
The object is not moving.
What variable is purposely changed in an experiment?
Independent variable.
What is the total force acting on an object called?
Net force.
What property of matter describes resistance to changes in motion?
Inertia.
What type of energy depends on position or height?
Potential energy.
What makes velocity different from speed?
Velocity includes direction.
What variable is measured in an experiment?
Dependent variable.
If forces are equal and opposite, what is the net force?
Zero.
According to Newton’s Second Law, acceleration depends on what two things?
Force and mass.
What energy change happens when a ball rolls down a hill?
Potential energy changes into kinetic energy.
If an object changes speed or direction, what is happening?
Acceleration
What variables must stay the same for a test?
Controlled variables.
What type of forces cause a change in motion?
Unbalanced Forces.
Which law states “every action has an equal and opposite reaction”?
Newton’s Third Law.
What law states that energy cannot be created or destroyed?
Law of Conservation of Energy.
What would a curved line getting steeper on a distance–time graph represent?
An object speeding up.
Why is lab safety important?
To prevent injuries.
A book sits still on a table. Are the forces on it balanced or unbalanced?
Balanced Force.
Why is a loaded shopping cart harder to push than an empty one?
It has more mass and more inertia.
What type of energy does a stretched rubber band or bowstring have?
Potential energy.
If an object’s distance decreases over time, which direction is it moving?
Why do scientists repeat experiments?
To increase reliability.