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Chapter 2 Review Grade-9 Jan 11, 2021
SCIENCE
GRADE-9
JAN 11, 2021
Ms.FAMIN
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Science
Secondary Education
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SCIENCE
GRADE-9
JAN 11, 2021
Ms.FAMIN
Slide 1 - Slide
LETS BEGIN
McGRAW hill Recall activity
Slide 2 - Slide
OBJECTIVES
Differentiate contact and non contact forces
state Universal law of gravitation
state Newton's laws of motion
Slide 3 - Slide
Slide 4 - Slide
You push a book sitting on a desk with a force of 5N, but the book does not move. what is its static friction?
A
0 N
B
Between 0N and 5N
C
5 N
D
Greater than 5N
Slide 5 - Quiz
Which is always a contact force?
A
electric
B
friction
C
gravity
D
magnetic
Slide 6 - Quiz
According to law of gravitation, gravity increases with which conditions?
A
mass increases, distance decreases
B
mass decreases, distance decreases
C
mass decreases, distance increases
D
none of the above
Slide 7 - Quiz
Explain why feather falls slowly rather than fast
Slide 8 - Open question
Slide 9 - Slide
INERTIA
Slide 10 - Slide
What causes an object in motion to remain in motion?
A
friction
B
gravity
C
velocity
D
inertia
Slide 11 - Quiz
Find the net force
A
8 N, right
B
2 N, left
C
2 N, right
D
8 N, left
Slide 12 - Quiz
Slide 13 - Slide
What happens when unbalanced forces act on an object at rest?
A
the object remain at rest
B
the object begins moving in an unpredictable direction
C
the object begins moving in the direction of the net force
D
the object begins moving opposite to the direction of net force
Slide 14 - Quiz
This equation goes with which law?
A
Newton's first law
B
netwon's second law
C
newton's third law
D
none of these
Slide 15 - Quiz
A cat pushes a 0.25 kg toy with net force 8 N, what is the acceleration of the ball?
A
2 m/s^2
B
16 m/s^2
C
4 m/s^2
D
32 m/s^2
Slide 16 - Quiz
Slide 17 - Slide
interpret
Slide 18 - Slide
When these marbles collide, what force is experienced by each marble?
A
The force on each is 0.1 N to the right.
B
The force on each is 0.1 in opposite directions.
C
The force on each is 0.1 N to the left
D
The force on the smaller marble is larger than the force on the larger marble
Slide 19 - Quiz
What is a measure of how hard it is to stop a moving object?
A
momentum
B
gravity
C
friction
D
velocity
Slide 20 - Quiz
back to objectives
Differentiate contact and non contact forces
state Universal law of gravitation
state Newton's laws of motion
Slide 21 - Slide
How well did you understand laws of motion?
Slide 22 - Mind map
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