FORCES AND MOTIONS TEST REVIEW
1. WHAT IS A FORCE? A PUSH or A PULL IS A FORCE.
2. FORCES CAN BE BALANCED OR UNBALANCED.
EQUAL FORCES ARE BALANCED AND RESULT IN NO MOVEMENT.
UNEQUAL FORCES ARE UNBALANCED AND RESULT IN MOVEMENT or
A CHANGE IN POSITION.
3.
EXPLAIN THE MOTION OF THE BOOK
BASED ON WHAT YOU KNOW ABOUT MOVEMENT.
IT HAS EQUAL FORCES BEING APPLIED FROM THE TABLE AND GRAVITY, SO
IT IS BALANCED, and NOT MOVING.
4.
WHAT IS THE NET FORCE ON THE BOOK IN
NEWTONS? 0 N
IS THIS PICTURE BALANCED OR UNBALANCED? BALANCED
WILL THE BOOK MOVE? NO
5. WHEN WE CALCULATE FORCES WE HAVE TO ADD ARROWS POINTING IN
THE SAME DIRECTION.
6. WHEN WE CALCULATE FORCES WE HAVE TO SUBTRACT ARROWS
POINTING IN OPPOSITE DIRECTIONS.
7. COMPLETE THE TABLE ABOUT THE MEMORY CUES FOR EACH TERM.
MOTION TERMS
MEMORY CUE
SPEED
VELOCITY
ACCELERATION
8. IDENTIFY THE FOLLOWING SCENARIOS USING YOUR MEMORY CUES FOR
SPEED, VELOCITY AND ACCELERATION.
A.
B.
C.
D.
E.
A car is driving 65 m.p.h. SPEED
The deer ran 35 mi/hr towards the south fence. VELOCITY
A student walks back and forth between classes. ACCELERATION
The winning driver averaged 185 miles per hour. SPEED
A roller coaster goes up and down through the hills. ACCELERATION
9. READ THE DISTANCE AND TIME GRAPHS BELOW. What is the AVERAGE
SPEED of the object in the graph below at each distance on the graph?
(Formula is S=D/T)
10. Describe each line and the motion it describes.
10.
EXPLAIN WHAT YOU SEE FOR EACH TERM.
STEADY SPEED = STRAIGHT DIAGONAL LINE (CONSTANT SPEED)
STOPPED = STRAIGHT HORIZONTAL LINE (STATIONARY)
ACCELERATING = UPWARDS CURVE
DECELERATING = DOWNWARD CURVE
11.
HOUR? 10 Km
HOW FAR DOES THE BOAT GO IN 1
WHAT IS THE BOATS AVERAGE SPEED IN Km/h? 10 K/H
12. AN OBJECT AT REST RECEIVES A 65N FORCE TO THE LEFT AND A 75N FORCE
TO THE RIGHT, WHAT IS THE NET FORCE? And, WHAT IS THE DIRECTION OF THE
MOTION? 10 Newtons to the RIGHT
13. WHAT IS THE SPEED OF A TRAIN THAT TRAVELS 125 MILES IN 2 HOURS? USE
THE FORMULA & SHOW YOUR WORK. (S=D/T)
14. WHAT IS THE AVERAGE SPEED OF A MOTORCYCLE THAT TRAVELS 400 MILES
IN 6 HOURS? USE THE FORMULA & SHOW YOUR WORK.
NEWTON’S LAWS TEST REVIEW & QUIZ
1ST LAW OF MOTION SAYS, “AN OBJECT AS REST, WILL STAY AT REST, AND AN
OBJECT IN MOTION WILL STAY IN MOTION, UNLESS ACTED UPON BY AN
UNBALANCED FORCE”.
THE 1ST LAW IS ALSO CALLED THE LAW OF INERTIA.
IMPORTANT TERM IS INERTIA. INERTIA IS AN OBJECT’S RESISTANCE TO MOVE or
RESISTANCE TO STOP MOVING DEPENDING ON WHAT IT IS DOING.
EXAMPLE – IT IS EASIER TO PUSH SAIRA ACROSS THE ROOM THAN IT IS TO PUSH
COACH SPAIN. WHY? MR. SPAIN MORE INERTIA, SAIRA HAS LESS INERTIA
EXPLAIN WHY THIS HAPPENS IN YOUR OWN
WORDS.
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2ND LAW OF MOTION = IS THE FORCE_=_MASS_X_ACCELERATION_ LAW.
THE 2ND LAW IS ALSO CALLED THE LAW OF ACCELERATION.
TO CALCULATE FORCE MULTIPLY
THE MASS TIMES ACCELERATION.
FORCE = MASS X ACCELERATION
OR
F = MA
EXPLAIN HOW TO USE THIS.
TO FIND FORCE…FORCE=MASS x ACCELERATION
TO FIND MASS…MASS=FORCE / ACCELERATION
TO FIND ACCELERATION...ACCELERATION=FORCE / MASS
3RD LAW OF MOTION SAYS “FOR EVERY ACTION THERE IS AN OPPOSITE AND
EQUAL REACTION.
EXAMPLE = IF YOU PUSH THE WALL WHILE STANDING ON A SKATEBOARD YOU
GO WHICH DIRECTION? THE SAME OR OPPOSITE DIRECTION YOU PUSHED.
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IN THE SPACE BELOW DRAW YOUR OWN EXAMPLE OF EACH LAW. DO NOT
REDRAW THE ONES ON THE REVIEW.