Force Motion

Page
5

drag the brick by a string attached to a spring scale along the surface of a table at a constant speed and read the force

hang the brick from a string attached to a spring scale and read the force

Slide 53

Sliding friction-the drag force created when the surface of one object slides across the surface of another object.

Sliding Friction Lab

Object

Surface

force (Newstons)

Slide 54

terminal velocity gravity will accelerate an object until air resistance (friction) does not allow it to go any faster.

gravity

air resistance

Slide 55

In the absence of air resistance, which of these objects will fall at the fastest rate when dropped?

the ball with a mass of 75 kg

the ball with a mass of 25 kg

the ball with a mass of 10 kg

They all fall at the same rate.

Slide 56

Pressure is the amount of force exerted over a certain area.

Pressure = Force

Area

Slide 57

Pressure = Force (newtons)

Area (m2)

1 Pascal = 1 Newton/meter2

Slide 58

Work

Slide 59

Work

W = f • d

{

Distance

Force

{

Distance

Slide 60

Gravitational force

Gravity

Slide 61

Gravitational force

Gravity

Slide 62

Gravitational force

INCREASES with Mass

DECREASES with Distance

Slide 63

All objects in the universe are attracted to each other by the force of

effort.

friction.

gravity.

inertia.

Slide 64

Four pairs of objects have the masses shown below. If the objects in each pair are the same distance apart, the gravitational force between the objects in which pair is greatest?

1 kilogram and 1 kilogram

1 kilogram and 2 kilograms

2 kilograms and 1 kilogram

2 kilograms and 2 kilograms

Slide 65

As an astronaut travels from Earth to a space station orbiting Earth, what happens to her mass and weight? Her mass decreases, but her weight remains the same. Her mass increases as her weight decreases. Her mass remains the same, but her weight decreases. Her mass decreases and her weight also decreases.