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Physics Chapter 2 Forces
Vocab for Chapter 2 Forces (Physics) Test
26
Science
8th Grade
04/05/2013

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Cards

Term

 

1. Force

Definition

 

A push or a pull on an object.

Term

 

2. Net Force 

 

Definition

The overall force on an object when all the individual forces acting on it are added together.

(if the net force is not zero - the object will move)

Term

 

3. Unbalanced Force

Definition
A non-zero net force which changes an object's motion.
Term

 

4. Balanced Force

Definition

Equal forces acting on an object in opposite directions.

(balanced force = no movement)

Term

 

5. Newton

Definition

 A unit of measure that equals the force required to accelerate 1 kg of mass at 1 m/s2.

 

(kg m/s2)

Term

 

6. Weight

Definition

 

A measure of the force of gravity acting on an object.

 

W = M x A (due to gravity)

Term

 

7. Inertia

Definition

 

The tendency of an object to resist a change in motion.

Term

 

8. Mass

Definition

 

The amount of matter in an object.

Term
9. Newton's 1st Law
Definition
An object at rest will remain at rest and an object in motion will stay in motion unless acted upon by an unbalanced force.
Term

 

10. Momentum

Definition

The product of an object's mass and velocity.

 

p = m v

Term

 

11. Friction

Definition
The force that two surfaces exert on each other when they rub against each other.
Term

 

12. Free fall

Definition
The motion of a falling object when the only force acting on it is gravity.
Term

 

13. Projectile

Definition

 

An object that is thrown.

Term

 

14. Air resistance

Definition

The fluid friction experienced by objects falling through the air.

 

(an upward force)

Term

 

15. Fluid friction

Definition
Friction that occurs as an object moves through a fluid (air or water).
Term

 

16. Static friction

Definition
Friction between objects that are not moving.
Term

 

17. Sliding friction

Definition
Friction that occurs when one solid surface slides over another.
Term

 

18. Rolling Friction

Definition
Friction that occurs when an object rolls over a surface.
Term

 

19. Gravity

Definition
The force that pulls objects towards each other.
Term

 

20. Satellite

Definition
Any object that orbits around another object in space.
Term

 

21. Terminal velocity

Definition

The maximum velocity a falling object can achieve.

 

When air resistance equals the force of gravity, the object continues to fall but eventually keeps a constant velocity.

Term

 

22. Centripetal force

Definition
A force that causes an object to move in a circle.
Term

 

23. Newton's 2nd Law

Definition

An object's acceleration depends on its mass and on the net force acting on it.

F = MA

Term

 

24. Law of Universal Gravitation

Definition

The force of gravity acts between all objects in the universe.

Any two objects in the universe attract each other.

Term

 

25. Law of Conservation of Momentum

Definition
The total momentum of any group of objects remains the same unless outside forces act on the object (such as friction).
Term

 

26. Newton's 3rd Law

Definition
For every action there is an equal but opposite reaction.
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