2. What is a force?
A force is a push or pull that causes an object to
move, stop, or change direction
In physics a force is anything that makes an object
accelerate
3. Force
Forces come in pairs
Forces have a magnitude and a
direction
1 N (Newton) = 1 kg * m/s/s
5N, north (up)
Magnitude: 5N
Direction: north (up)
4. Balanced and Unbalanced Forces
Forces occur in pairs and they can be
either balanced or unbalanced
5. Balanced Forces
Balanced forces do not cause change
in motion
They are equal in size and opposite in
direction
6. Unbalanced Forces
An unbalanced force always causes a
change in motion
When unbalanced forces act in opposite
directions you can find the net force
Net force
Magnitude
The difference between the two forces
Direction
Direction of the largest force
10. Video Quiz- (6 Questions)
1. The Scientist who devised the 3 laws
of motion was:
A) Isaac Newton
B) Albert Einstein
C) Charles Darwin
D) Thomas Edison
11. Video Quiz
2. The first law of motion states that if all
the forces acting upon an object are
BALANCED, then there will be:
A) acceleration
B) the object stopping
C) no acceleration
D) deceleration
12. Video Quiz
3. No acceleration means:
A) increasing velocity OR the object is
stationary
B) constant velocity OR the object is
stationary
C) decreasing velocity OR the object is
stationary
13. Video Quiz
4. The size of the force of gravity is an
object's:
A) density
B) mass
C) weight
D) chemical structure
14. Video Quiz
5. When forces are BALANCED on an
object, the object will either:
A) decelerate OR accelerate
B) start moving OR decelerate
C) stop moving OR travel at a constant
velocity
D) remain stationary OR travel at a
constant velocity
15. Video Quiz
6. When forces are UNBALANCED on an
object, the object will either:
A) remain stationary OR travel at a
constant velocity
B) accelerate OR decelerate
C) start moving OR travel at a constant
velocity
D) stop moving OR travel at a constant
velocity
16. Video Quiz- (6 Questions)
1. The Scientist who devised the 3 laws
of motion was:
A) Isaac Newton
B) Albert Einstein
C) Charles Darwin
D) Thomas Edison
17. Video Quiz
2. The first law of motion states that if all
the forces acting upon an object are
BALANCED, then there will be:
A) acceleration
B) the object stopping
C) no acceleration
D) deceleration
18. Video Quiz
3. No acceleration means:
A) increasing velocity OR the object is
stationary
B) constant velocity OR the object is
stationary
C) decreasing velocity OR the object is
stationary
19. Video Quiz
4. The size of the force of gravity is an
object's:
A) density
B) mass
C) weight
D) chemical structure
20. Video Quiz
5. When forces are BALANCED on an
object, the object will either:
A) decelerate OR accelerate
B) start moving OR decelerate
C) stop moving OR travel at a constant
velocity
D) remain stationary OR travel at a
constant velocity
21. Video Quiz
6. When forces are UNBALANCED on an
object, the object will either:
A) remain stationary OR travel at a
constant velocity
B) accelerate OR decelerate
C) start moving OR travel at a constant
velocity
D) stop moving OR travel at a constant
velocity