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. _The motion of the book is balanced as it has no movement, the forces acting on the book are the same and in opposite direction which equals them out to a net force (total) of zero. BALANCED FORCES______
4. WHAT IS THE NET FORCE ON THE BOOK IN NEWTONS? _0______N F= 20-20=0 (forces are going in opposite direction which you subtract)
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 CUESPEED / Speed = distance ÷ time
VELOCITY / Speed and direction
ACCELERATION / Change in velocity and direction (increase / decrease velocity)
8. IDENTIFY THE FOLLOWING SCENARIOS USING YOUR MEMORY CUES FOR SPEED, VELOCITY AND ACCELERATION.
A. A car is driving 65 m.p.h. __speed______
B. The deer ran 35 mi/hr towards the south fence. _velocity______
C. A student walks back and forth between classes. __acceleration______
D. The winning driver averaged 185 miles per hour. _speed______
E. 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 = ___It is moving away at a constant (same) speed______
STOPPED = _the object is not moving, it standing still in the same distance as time is passing______
ACCELERATING = _it is moving away and getting faster as it curves upward in a positive / greater distance______
DECELERATING = ______it is curving in the opposite direction from acceleration as its distance is decreasing______
11. HOW FAR DOES THE BOAT GO IN 1 HOUR? __10 km______Km
WHAT IS THE BOATS AVERAGE SPEED IN Km/h? _s = d ÷_t = 50 ÷ 5 = 10 km/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? __75N – 65N = 10N______Newtons to the __Right (greater force)______
13. WHAT IS THE SPEED OF A TRAIN THAT TRAVELS 125 MILES IN 2 HOURS? USE THE FORMULA & SHOW YOUR WORK.
s = d ÷_t = 125 mi ÷_2h = 62.5 mi/h
14. WHAT IS THE AVERAGE SPEED OF A MOTORCYCLE THAT TRAVELS 400 MILES IN 6 HOURS? USE THE FORMULA & SHOW YOUR WORK.
s = d ÷_t = 400 mi ÷_6h= 66.7mi/h
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 ____Law of Inertia______
IMPORTANT TERM IS INERTIA. INERTIA IS AN OBJECTS RESISTANCE TO MOVE or RESISTANCE TO STOP MOVING DEPENDING ON WHAT IT IS DOING.
EXAMPLE – IT IS EASIER TO PUSH MARLENE ACROSS THE ROOM THAN IT IS TO PUSH COACH PEARSON. WHY? _HE IS BIGGER AND TALLER THAN MARLENE THEREFORE HAVE MORE FORCE______
EXPLAIN WHY THIS HAPPENS IN YOUR OWN WORDS. According to the law of inertia, the person is moving at the same speed as the car but when the person suddenly breaks his body wants to keep moving at the same speed the car was originally moving. The seatbelt holds the person in place so they wont be propelled out through the windshield. ______
2ND LAW OF MOTION = IS THE ___Force_____=___mass____X_acceleration______ LAW.
THE 2ND LAW IS ALSO CALLED _____Law of force and acceleration______
TO CALCULATE FORCE MULTIPLY
THE MASS TIMES ACCELERATION.
FORCE = MASS X ACCELERATION
OR
F = MA
EXPLAIN HOW TO USE THIS.
TO FIND FORCE…___F = m x a______
TO FIND MASS…___m = F ÷ a______
TO FIND ACCELERATION...__a = F ÷ m______
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.
_Newton’s third law states that the direction of the action force will always be the same force but going in the opposite direction of the reaction force._____
IN THE SPACE BELOW DRAW YOUR OWN EXAMPLE OF EACH LAW. DO NOT REDRAW THE ONES ON THE REVIEW.