Forces

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created 6 years ago by streece
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updated 6 years ago by streece
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8th grade
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1

What is a force?

a push or a pull

2

How is force described?

by its magnitude and direction

3

What is the SI unit of a force?

(N) newton

4

What kind of forces acting on an object result in a net force and cause a change in the object's velocity?

unbalanced

5

Equal forces acting on one object in opposite directions are called?

balanced forces

6

What is friction?

a force the two surfaces exert on each other when they rub against each other

7

What two factors determine the strength of the friction?

the types of surfaces involved and how hard they push together

8

What are the four types of friction?

static, sliding, rolling, fluid

9

What is a force that pulls objects toward each other?

gravity

10

The amount of matter something has is called its?

mass

11

The amount of gravity between two objects depends on their masses and the

distance between them

12

What is weight?

the force of gravity on an object

13

When only the force of gravity is acting on an object, the object is said to be in?

free fall

14

What is a type of fluid friction that acts on objects falling through air?

air resistance

15

An elastic force that stretches or pulls matter is called?

tension

16

What does Newton's first law of motion state?

An object will remain at rest or moving at a constant velocity unless it is acted upon by an unbalanced force.

17

The tendency of an object to resist a change in motion is known as?

inertia

18

How is acceleration calculated?

Net force divided by mass

19

What is Newton's second law of motion?

acceleration depends on the net force acting on the object and on the object's mass

20

What does Newton's third law of motion state?

For every action, there is an equal but opposite reaction

21

How is momentum calculated?

mass x velocity

22

What does the law of conservation of momentum state?

the total momentum of any group of objects remains the same unless outside forces act on the objects

23

What is a centripetal force?

a force that causes an object to move in a circular path

24

Why do satellites in orbit around Earth continuously fall toward Earth, but never hit it?

Earth is curved, so they travel around it.