Transcript File - Coach Ed Science

The motion does not change
The greater the mass, the greater the
force necessary
Ice
Friction
The force increases with the increased
mass.
Mass and Distance
2J
Work = Force x Distance
Make work easier
Ax
Mechanical Advantage = Force out
divided by Force in
Mechanical Advantage = Force out
divided by Force in.
9N divided by 3N = 3
A. Reduce the amount of work that
Is done.
2
The chair pushes on the baby
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.
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.
A. Input force is 40N and work done is 0J.
Inertia
Acceleration
0.5 m/s
Because the child is constantly
changing direction!
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.
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.
A.
B.
½ x5 kg x (2 m/s)2
=1/2 x 5kg x 4m/s
=1/2 x 20J
=10J
Position
Motion
A force
Contact
Reference Point
Gravity
Friction
Relative Motion
Net force
Speed is distance divided by time
Increase force
B. Decrease force
C. Increase mass
D. Increase inertia
A.
Increase force
B.
Decrease force
C. Increase mass
D. Increase inertia
A.
A. Increase force
Reference point
Speed = distance divided by time
4 km/h
Change the “half an hour” to 0.5 hours.
Size and direction
Newton
Zero
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.
b.
Zero
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.
b.
A = final velocity – initial velocity
divided by 2.
10 m/s/s
The box moves toward John
Large rock, pencil feather, book
Large rock, pencil feather, book
Feather, pencil, book, large rock.
No acceleration
Positive acceleration
Negative acceleration
d. Constant velocity
a.
b.
c.
No acceleration
Positive acceleration
Negative acceleration
d. Constant velocity
a.
b.
c.
C.
pressure
Pressure = force divided by area
pascal
True
Increasing elevation decreases air
pressure
Increasing depth increases water
pressure
friction
Force and speed
Force and distance
c. Energy and time
Energy and distance
a.
b.
d.
Force and speed
Force and distance
c. Energy and time
Energy and distance
a.
b.
d.
B
No. Work requires movement in the
direction of the force
Force
b. Work
c. Energy
d. power
a.
Force
b. Work
c. Energy
d. Power
a.
D
Horsepower
They add together
Increase mass
b.
Decrease mass
c.
Decrease force
Increase both mass and force
proportionally
a.
d.
Increase mass
b. Decrease mass
c. Decrease force
Increase both mass and force
proportionally
a.
d.
B
A.
B.
Your shoes on the sidewalk while
walking.
Bike tires on the road as you ride
C. Ice skates while skating
D. Lighting a match
A.
B.
Your shoes on the sidewalk while
walking.
Bike tires on the road as you ride
C. Ice skates while skating
D. Lighting a match
B