Physics Test Review

Test Monday

Newton’s 1st Law of Motion

1. An object at rest will remain at rest, and an object in motion will remain in motion until acted upon by an .

2. Also known as .

Unbalanced ForceInertia

Newton’s 2nd Law of Motion

2. Force = × mass acceleration

Newton’s 3rd Law of Motion

Every action has an and reaction.

equalopposite

Forces

Forces act on matter to change its position and create .

Any or is a force.Unit of force = . is a force which will slow down

or stop an object. force pulls everything to

the center of the Earth.

motionpush pull

NewtonFriction

Gravitational

Forces

Weight is measured on a .Mass is measured on a .Where would you weigh the least

amount?– Moon

– Earth

balancescale

Forces

An object falls due to .Gravity will cause the mass of a falling

object to .If dropped, which would hit the ground

first?– Bowling ball– Baseball

gravity

accelerate

Both would hit at the same time.

Forces

Force = × mass acceleration

M A

F

Force is measured in Newtons.

Force = Mass × Acceleration

Acceleration is the rate of change in an object’s velocity.

Object speeds up = Object slows down = Unit for acceleration = .

acceleration

deceleration

m/s²

Speed

Speed = / distance time

S T

DSpeed is measured in m/s.

Work

Work = × Force distance

F d

WWork is measured in Joules.

Practice Problems

If sound travels at a speed of 330 m/s, how long would it take you to hear thunder 1,750 meters away?

330 m/s1,750

metersWhat information do you know?

Speed = 330 m/sDistance = 1,750 meters

Which equation should you use?Speed= Distance / Time

Practice Problems

If a force of 3000 N can move a crate at an acceleration of 1.5 m/s2, what is the mass of the object?

3000 N

1.5 m/s²

What information do you know?Force = 3000 NAcceleration = 1.5 m/s²

Which equation should you use?Force= Mass × Acceleration

Practice Problems

How much work does an elephant do while moving a circus wagon 20 meters will a pulling force of 200 N?

20 meters200 N

What information do you know?

Force = 200 NDistance = 200 N

Which equation should you use?Work= Force × Distance

Pace for One Runner

0

5

10

15

20

25

30

35

40

45

1 2 3 4 5

Time (seconds)

Dis

tan

ce (

yard

s)

Distance-Time Graphs

Where was the runner at rest?

Where was the runner’s speed the fastest?

0-1 seconds, 3-4 seconds

1-2 seconds

Pace for One Runner

0

5

1015

20

25

3035

40

45

1 2 3 4 5

Time (seconds)

Dis

tan

ce (

yard

s)

Height of Ramp

Length of Ramp

Mass of Marble

Average Distance

Marble Rolled

2 cm 88 cm 1g 188 cm

4 cm 88 cm 1g 376 cm

8 cm 88 cm 1g 752 cm

16 cm 88 cm 1g 1504 cm

What a blast lab data chart

What would be the initial problem for this investigation?

At which point would the marble have potential energy?

What would the independent variable be in this investigation?

What would the dependent variable be in this investigation?

What would the control variables be in this investigation?

How will the height of the ramp affect how far the marble will roll?

At the top of the ramp

Ramp height

Distance marble rolledLength of ramp, mass of marble

Newton’s Laws of Motion

You hit the cue ball into eight ball to win a pool game.

Professional baseball players use wooden bats with more mass than aluminum bats with less mass.

Exploding fuel in a rocket ship propels the rocket into space.

It is easier to push a car in neutral than a bus in neutral.

1st Law of Motion

2nd Law of Motion

2nd Law of Motion

3rd Law of Motion

Practice Problems

Amanda, a student in science class, walked backwards with an average speed of 3 m/s.   If she completed her walk in 15 seconds, what was the total distance she traveled in meters?

Practice Problems

You are moving a dresser that has a mass of 36 kg. Its acceleration is 0.5 m/s2. What is the force being applied?

Practice Problems

You drive a total of 600 km in 12 hours. On average, how fast were you driving?

Practice Problems

If 450 J of work is done to push a toy truck up the driveway 15 meters, how much force are you applying to the toy truck?