Force Motion

Page
2

Acceleration the change in velocity over time.

Acceleration =

change in velocity

time

(v2 – v1 )

Acceleration =

Time

V1 = beginning velocity

V2 = ending velocity

Slide 15

The graph below relates speed and time of four cars (1, 2, 3, and 4) traveling along a straight highway.

Which two cars move with zero acceleration?

1 and 4

2 and 3

1 and 2

3 and 4

Slide 16

Which of the following is certain to change as a ball accelerates?

mass of the ball

inertia of the ball

velocity of the ball

force acting on the ball

Slide 17

What must happen to an object in order to accelerate it?

A net force must be applied.

Some weight must be removed.

Its frictional coefficient must be reduced.

It must contain momentum.

Slide 18

Which of these describes the object with the largest acceleration ?

An object with a small change in velocity over a small change in time

An object with a small change in velocity over a large change in time

An object with a large change in velocity over a small change in time

An object with a large change in velocity over a large change in time

Slide 19

Scalar

a measurement that does

NOT contain direction.

Egg sample: Speed

Vector

a measurement that contains direction.

Egg sample: Velocity

Slide 20

Forces of Nature

Gravitational Magnetic

Slide 21

Mass and Inertia

The universe

consists of matter

in motion

Slide 22

The greater the mass

the harder it is to move.

And . . .

the harder it is to stop moving.

Slide 23

Lower mass objects are easier to move . . .and to stop moving.

Slide 24

NEWTON’s Laws

1st Law of Motion :

An object remains at a

in a ,until a net force acts on it.

constant speed

straight path

Slide 25

Inertia

ih ner shah

An object will

remain at a

constant speed

(unless disturbed).

NEWTON’s 1st Law of Motion is the law of