This document defines key terms related to motion and forces in physics. It provides definitions for terms like distance, displacement, speed, velocity, acceleration, force, contact force, non-contact force, friction, gravity, balanced force, unbalanced force, inertia, and Newton's three laws of motion. Newton's laws of motion describe how forces affect the motion of objects.
8. Velocity
The speed of something in a given direction.
The velocity of the car was tremendous.
9. acceleration
An increase in the rate or speed of something.
The motorcycle gear made the acceleration speed up.
10. force
Strength or energy as an attribute of physical action or movement.
The force of the wind blew me over.
11. contact force
Is a force that acts at the point of contact between two objects, in contrast to body forces
The contact force of the ball and player was extreme.
12. Noncontact force
A non-contact force is a force applied to an object by another body that is not in direct contact with it.
The sun has a non contact force with the Earth.
13. friction
The resistance that one surface or object encounters when moving over another.
The friction caused static electricity.
14. gravity
The force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity
The gravity kept me grounded.
15. balanced force
Balance forces are two forces acting in opposite directions on an object, and equal in size
The teeter totter had balanced force with two people on it.
16. unbalanced force
Unbalanced forces are forces that cause a change in the motion of an object.
With no one the teeter totter it had unbalanced force.
17. inertia
A property of matter by which it continues in its existing state of rest or uniform motion in a straight line,
The inertia kept the airplane moving forward.
18. newtons first law of motion
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless ac
wtons first law of inertia was what kept me moving on the skate bo
19. newtons second law of motion
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction
Newton’s second law of inertia helped the airplane fly.
20. newtons third law of motion
For every action, there is an equal and opposite reaction.
Newton’s third law of motion kept the motion going.
21. force pair
According to Newton's third law, for every action force there is an equal (in size) and opposite (in direction) reaction force.
The bat hitting the baseball is an example of force pair.
