the motion does not change the greater the mass, the greater the force necessary

FORCE AND MOTION REVIEW

WHAT HAPPENS TO THE MOTION

OF AN OBJECT WHEN THE

FORCES ARE BALANCED?

WHAT HAPPENS TO THE MOTION

OF AN OBJECT WHEN THE

FORCES ARE BALANCED?

The motion does not change

HOW IS AN OBJECT’S MASS

RELATED TO THE FORCE NEEDED TO

ACCELERATE THE OBJECT?

HOW IS AN OBJECT’S MASS

RELATED TO THE FORCE NEEDED TO

ACCELERATE THE OBJECT?

The greater the mass, the greater the force necessary

A PERSON PRODUCES THE LEAST FRICTION

ON WHICH SURFACE?

A. CARPET B. ICE C. SAND D. WOOD

FLOOR

A PERSON PRODUCES THE LEAST FRICTION

ON WHICH SURFACE?

A. CARPET B. ICE C. SAND D. WOOD

FLOOR

Ice

AIR RESISTANCE IS AN EXAMPLE

OF WHAT?

AIR RESISTANCE IS AN EXAMPLE

OF WHAT?Friction

WHAT HAPPENS TO YOUR

GRAVITATIONAL FORCE AS YOU

GROW?

WHAT HAPPENS TO YOUR

GRAVITATIONAL FORCE AS YOU

GROW?The force increases with the

increased mass.

WHAT TWO FACTORS AFFECT

THE GRAVITATIONAL

ATTRACTION BETWEEN TWO

OBJECTS?

WHAT TWO FACTORS AFFECT

THE GRAVITATIONAL

ATTRACTION BETWEEN TWO

OBJECTS?Mass and Distance

IF YOU APPLY A FORCE ON 1N ON A BOOK TO LIFT IT 2 METERS HIGH, HOW MUCH WORK DID YOU DO?

IF YOU APPLY A FORCE ON 1N ON A BOOK TO LIFT IT 2 METERS HIGH, HOW MUCH WORK DID YOU DO?

2J

Work = Force x Distance

WHAT DOES A SIMPLE

MACHINE DO?

WHAT DOES A SIMPLE

MACHINE DO?Make work easier

WHICH MACHINE IS A WEDGE?

A. TRUCK RAMP B. AX

C. WHEELBARROW D. DOORKNOB

WHICH MACHINE IS A WEDGE?

A. TRUCK RAMP B. AX

C. WHEELBARROW D. DOORKNOB

Ax

WHAT IS THE MECHANICAL

ADVANTAGE OF A WEDGE THAT

REQUIRES AN INPUT FORCE OF 3 N TO

PRODUCE AN OUTPUT OF 9 N?

WHAT IS THE MECHANICAL

ADVANTAGE OF A WEDGE THAT

REQUIRES AN INPUT FORCE OF 3 N TO

PRODUCE AN OUTPUT OF 9 N?

Mechanical Advantage = Force out divided by Force in

WHAT IS THE MECHANICAL

ADVANTAGE OF A WEDGE THAT

REQUIRES AN INPUT FORCE OF 3N TO

PRODUCE AN OUTPUT OF 9N?

Mechanical Advantage = Force out divided by Force in.

9N divided by 3N = 3

A SIMPLE MACHINE CANNOT: A. REDUCE THE AMOUNT OF WORK

THAT IS DONE. B. CHANGE THE DIRECTION OF A

FORCE. C. DECREASE THE INPUT FORCE

NEEDED. D. INCREASE THE DISTANCE OVER WHICH THE FORCE IS EXERTED.

A SIMPLE MACHINE CANNOT: A. REDUCE THE AMOUNT OF WORK

THAT IS DONE. B. CHANGE THE DIRECTION OF A

FORCE. C. DECREASE THE INPUT FORCE

NEEDED. D. INCREASE THE DISTANCE OVER WHICH THE FORCE IS EXERTED.

A. Reduce the amount of work that Is done.

WHAT IS THE MECHANICAL

ADVANTAGE OF A WHEEL AND AXLE

THAT REQUIRES AN INPUT FORCE OF

2.5N TO PRODUCE AN OUTPUT FORCE OF

5N?

WHAT IS THE MECHANICAL

ADVANTAGE OF A WHEEL AND AXLE

THAT REQUIRES AN INPUT FORCE OF

2.5N TO PRODUCE AN OUTPUT FORCE OF

5N?2

A BABY PUSHES ON A LARGE

CHAIR. WHAT IS THE REACTION

FORCE?

A BABY PUSHES ON A LARGE

CHAIR. WHAT IS THE REACTION

FORCE?The chair pushes on the baby

A STUDENT PUSHES ON A LEVER WITH

THE FORCE OF 40N. THE 150-N LOAD

DOES NOT MOVE. WHICH OF THE

FOLLOWING IS TRUE?A. Input force is 40N and work done

is 0J.

B. Input force is 40N and work done is 600J.

C. Output force is 40N and work done is 150J.

D. D. Output force is 150N and work is 40J.

A STUDENT PUSHES ON A LEVER WITH

THE FORCE OF 40N. THE 150-N LOAD

DOES NOT MOVE. WHICH OF THE

FOLLOWING IS TRUE?A. Input force is 40N and work done is 0J.

B. Input force is 40N and work done is 600J.

C. Output force is 40N and work done is 150J.

D. D. Output force is 150N and work is 40J.

A. Input force is 40N and work done is 0J.

THE TENDENCY OF AN OBJECT

AT REST TO STAY AT REST IS

WHAT?

THE TENDENCY OF AN OBJECT

AT REST TO STAY AT REST IS

WHAT?Inertia

WHAT IS A CHANGE IN

VELOCITY CALLED?

WHAT IS A CHANGE IN

VELOCITY CALLED?

Acceleration

A BALL ROLLS A DISTANCE OF 1

METER FOR 2 SECONDS. WHAT IS THE SPEED OF THE

BALL?

A BALL ROLLS A DISTANCE OF 1

METER FOR 2 SECONDS. WHAT IS THE SPEED OF THE

BALL?0.5 m/s

A CHILD RIDING ON A CAROUSEL IS CONSTANTLY ACCELERATING.

WHY?

A CHILD RIDING ON A CAROUSEL IS CONSTANTLY ACCELERATING.

WHY?Because the child is constantly

changing direction!

WHICH OF THE FOLLOWING

STATEMENTS ABOUT A 1 KG BLOCK OF

METAL FALLING FROM A TOWER IS

FALSE?A. Gravity causes a net downward

force on the block

B. B. Gravitational attraction decreases as the block gets closer to the

ground.

C. C. Gravitational attraction causes the block to accelerate as it falls.

D. D. Gravity causes an unbalanced force on the block.

WHICH OF THE FOLLOWING

STATEMENTS ABOUT A 1 KG BLOCK OF

METAL FALLING FROM A TOWER IS

FALSE?A. Gravity causes a net downward force

on the block

B. B. Gravitational attraction decreases as the block gets closer to the ground.

C. C. Gravitational attraction causes the block to accelerate as it falls.

D. D. Gravity causes an unbalanced force on the block.

B.

KINETIC ENERGY =1/2  M  V²

A BOWLING BALL WITH A MASS OF 5 KG IS ROLLING AT 2 M/S.

WHAT IS THE KINETIC ENERGY?

KINETIC ENERGY =1/2  M  V²

A BOWLING BALL WITH A MASS OF 5 KG IS ROLLING AT 2 M/S.

WHAT IS THE KINETIC ENERGY?

½ x5 kg x (2 m/s)2

=1/2 x 5kg x 4m/s=1/2 x 20J

=10J

THE LOCATION OF A PLACE OR

OBJECT IS CALLED?

THE LOCATION OF A PLACE OR

OBJECT IS CALLED?

Position

THE CHANGE OF POSITION OVER

TIME IS CALLED?

THE CHANGE OF POSITION OVER

TIME IS CALLED?Motion

A PUSH OR A PULL IS

CALLED?

A PUSH OR A PULL IS

CALLED?A force

WHEN ONE OBJECT PUSHES ANOTHER

OBJECT BY TOUCHING IT, THE FIRST OBJECT IS

APPLYING A _______

FORCE TO THE SECOND.

WHEN ONE OBJECT PUSHES ANOTHER

OBJECT BY TOUCHING IT, THE FIRST OBJECT IS

APPLYING A _______

FORCE TO THE SECOND.Contact

A LOCATION YOU COMPARE

TO OTHER LOCATIONS IS

CALLED?

A LOCATION YOU COMPARE

TO OTHER LOCATIONS IS

CALLED?Reference Point

A FORCE OF ATTRACTION

BETWEEN TWO OBJECTS IS

WHAT?

A FORCE OF ATTRACTION

BETWEEN TWO OBJECTS IS

WHAT?Gravity

A FORCE THAT RESISTS

MOTION IS CALLED WHAT?

A FORCE THAT RESISTS

MOTION IS CALLED WHAT?

Friction

HOW AN OBSERVER SEES

YOUR MOTION DEPENDS ON

HIS OWN MOTION. THIS IS

CALLED WHAT?

HOW AN OBSERVER SEES

YOUR MOTION DEPENDS ON

HIS OWN MOTION. THIS IS

CALLED WHAT?Relative Motion

CONSIDERING THE SIZE AND DIRECTION OF ALL FORCES ACTING ON AN OBJECT ALLOWS US TO

PREDICT CHANGES IN MOTION. THE OVERALL FORCE ACTING ON AN

OBJECT WHEN ALL FORCES ARE COMBINED

IS CALLED WHAT?

CONSIDERING THE SIZE AND DIRECTION OF ALL FORCES ACTING ON AN OBJECT ALLOWS US TO

PREDICT CHANGES IN MOTION. THE OVERALL FORCE ACTING ON AN

OBJECT WHEN ALL FORCES ARE COMBINED

IS CALLED WHAT?Net force

HOW IS SPEED RELATED TO

DISTANCE AND TIME?

HOW IS SPEED RELATED TO

DISTANCE AND TIME?

Speed is distance divided by time

NEWTON’S 2ND LAW STATES

THAT TO INCREASE

ACCELERATION, YOU MUST

A. Increase force

B. Decrease force

C. Increase mass

D. Increase inertia

NEWTON’S 2ND LAW STATES

THAT TO INCREASE

ACCELERATION, YOU MUST

A. Increase force

B. Decrease force

C. Increase mass

D. Increase inertia

A. Increase force

A POSITION DESCRIBES AN

OBJECT’S LOCATION

COMPARED TO A…..

A POSITION DESCRIBES AN

OBJECT’S LOCATION

COMPARED TO A…..

Reference point

MARIA WALKED 2 KM IN HALF

AN HOUR. WHAT WAS HER AVERAGE

SPEED?

MARIA WALKED 2 KM IN HALF

AN HOUR. WHAT WAS HER AVERAGE

SPEED?Speed = distance divided by time

4 km/h

Change the “half an hour” to 0.5 hours.

A VECTOR IS A QUANTITY THAT

HAS WHAT?

A VECTOR IS A QUANTITY THAT

HAS WHAT?Size and direction

WHAT UNIT MEASURES

FORCE?

WHAT UNIT MEASURES

FORCE?Newton

A MORE MASSIVE MARBLE COLLIDES

WITH A LESS MASSIVE ONE. THE TOTAL MOMENTUM

AFTER COLLISION IS EQUAL TO…….

a. Zero

b. The original momentum of the more massive marble

c. The original momentum of the smaller marble

d. Twice the momentum of the more massive marble

A MORE MASSIVE MARBLE COLLIDES

WITH A LESS MASSIVE ONE. THE TOTAL MOMENTUM

AFTER COLLISION IS EQUAL TO…….

a. Zero

b. The original momentum of the more massive marble

c. The original momentum of the smaller marble

d. Twice the momentum of the more massive marble

B.

A CHEETAH CAN GO FROM 0 M/S TO 20 M/S IN 2

SECONDS. WHAT IS THE

CAT’S ACCELERATION?

A CHEETAH CAN GO FROM 0 M/S TO 20 M/S IN 2

SECONDS. WHAT IS THE

CAT’S ACCELERATION?A = final velocity – initial velocity

divided by 2.

10 m/s/s

JOHN PULLS A BOX WITH A FORCE OF

4 N, AND JASON PULLS THE BOX

FROM THE OPPOSITE SIDE AT

3 N. WHAT HAPPENS?

JOHN PULLS A BOX WITH A FORCE OF

4 N, AND JASON PULLS THE BOX

FROM THE OPPOSITE SIDE AT

3 N. WHAT HAPPENS?

The box moves toward John

LIST THE FOLLOWING OBJECTS IN ORDER OF

LEAST INERTIA TO GREATEST

Large rock, pencil feather, book

LIST THE FOLLOWING OBJECTS IN ORDER OF

LEAST INERTIA TO GREATEST

Large rock, pencil feather, book

Feather, pencil, book, large rock.

A CAR TRAVELING AT 40 M/S SLOWS

TO 20 M/S. DURING THIS

TIME, THE CAR HAS…..

a. No acceleration

b. Positive acceleration

c. Negative acceleration

d. Constant velocity

A CAR TRAVELING AT 40 M/S SLOWS

TO 20 M/S. DURING THIS

TIME, THE CAR HAS…..

a. No acceleration

b. Positive acceleration

c. Negative acceleration

d. Constant velocity

C.

WHAT IS THE MEASURE OF

HOW MUCH FORCE IS

ACTING ON A CERTAIN AREA?

WHAT IS THE MEASURE OF

HOW MUCH FORCE IS

ACTING ON A CERTAIN AREA?

pressure

WHAT IS THE FORMULA FOR

PRESSURE?

WHAT IS THE FORMULA FOR

PRESSURE?Pressure = force divided by area

WHAT IS THE UNIT FOR

PRESSURE?

WHAT IS THE UNIT FOR

PRESSURE?pascal

TRUE OR FALSE:PRESSURE ACTS

IN ALL DIRECTIONS IN

LIQUIDS?

TRUE OR FALSE:PRESSURE ACTS

IN ALL DIRECTIONS IN

LIQUIDS?True

HOW DOES CHANGING ELEVATION

AFFECT AIR PRESSURE?

WATER PRESSURE?

HOW DOES CHANGING ELEVATION

AFFECT AIR PRESSURE?

WATER PRESSURE?

Increasing elevation decreases air pressure

Increasing depth increases water pressure

YOU KICK A BALL ON A

LEVEL SIDEWALK. IT

ROLLS TO A STOP BECAUSE

OF WHAT?

YOU KICK A BALL ON A

LEVEL SIDEWALK. IT

ROLLS TO A STOP BECAUSE

OF WHAT?friction

WORK IS CALCULATED

FROM….a. Force and speed

b. Force and distance

c. Energy and time

d. Energy and distance

WORK IS CALCULATED

FROM….a. Force and speed

b. Force and distance

c. Energy and time

d. Energy and distance

B

ARE YOU DOING WORK BY

BALANCING A BOOK ON YOUR

HEAD?

ARE YOU DOING WORK BY

BALANCING A BOOK ON YOUR

HEAD?No. Work requires movement in the

direction of the force

BY INCREASING THE SPEED AT

WHICH YOU DO WORK, YOU

WILL INCREASE WHAT?

a. Force

b. Work

c. Energy

d. power

BY INCREASING THE SPEED AT

WHICH YOU DO WORK, YOU

WILL INCREASE WHAT?

a. Force

b. Work

c. Energy

d. Power

D

THE UNIT OF MEASURE FOR

LARGE MOTORS AND ENGINES IS

WHAT?

THE UNIT OF MEASURE FOR

LARGE MOTORS AND ENGINES IS

WHAT?Horsepower

WHAT HAPPENS WHEN TWO

FORCES ACT IN THE SAME

DIRECTION?

WHAT HAPPENS WHEN TWO

FORCES ACT IN THE SAME

DIRECTION?They add together

ONE WAY TO INCREASE

ACCELERATION IS TO

a. Increase mass

b. Decrease mass

c. Decrease force

d. Increase both mass and force proportionally

ONE WAY TO INCREASE

ACCELERATION IS TO

a. Increase mass

b. Decrease mass

c. Decrease force

d. Increase both mass and force proportionally

B

WHICH OF THE FOLLOWING IS

AN EXAMPLE OF ROLLING

FRICTION?A. Your shoes on the sidewalk

while walking.

B. Bike tires on the road as you ride

C. Ice skates while skating

D. Lighting a match

WHICH OF THE FOLLOWING IS

AN EXAMPLE OF ROLLING

FRICTION?A. Your shoes on the sidewalk

while walking.

B. Bike tires on the road as you ride

C. Ice skates while skating

D. Lighting a match

B