#### Cheri Scheer

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Transcript Cheri Scheer

Cheri Scheer
Force and Motion
Force and motion
Science 7
Strand 2
Objective 1a, 2a, b, d,e,f
GLE link
overview
Effects of Motion
graph
Average speed- distance divided by time
Distance- average speed x time
Velocity- speed of object and direction of
motion
Acceleration- change in velocity divided by
time needed for the change.
Force- push or pull
Measured in Newtons
Pounds x 4.4
Force= mass x acceleration
Force
Two forces in the same direction equals the
sum of the forces
Two equal forces in opposite directions
equals no net force
Two unequal forces act in opposite
directions equal the difference in the forces
PRACTICE
Newton’s 1st Law of Motion
An object will not change motion unless
unbalanced force act on it.
Object at stays at rest, object in motion
stays in motion (until it is is acted on)
Effects motion
Friction- force between two surface in
contact that resist each other
Inertia- tendency to resist change
Mass of object will effect both.
Newton’s 2nd law of motion
Object is acted on by net force the
acceleration is in the direction of the force
and equal to the force divided by mass.
Acceleration = net force
Mass
Newton’s 3rd law
When one object exerts a force on a second
object, the second object also exerts an
equal force in the opposite direction