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Force and Motion: Physical Science

The document discusses the basic concepts of force and motion. It defines a force as a push or pull and explains balanced and unbalanced forces. It then summarizes Newton's Three Laws of Motion - an object at rest stays at rest unless a force acts on it, force equals mass times acceleration, and for every action there is an equal and opposite reaction. The document also discusses friction, gravity, and how gravity depends on mass and distance from the object's center.

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AICKEN N. SAGA
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145 views16 pages

Force and Motion: Physical Science

The document discusses the basic concepts of force and motion. It defines a force as a push or pull and explains balanced and unbalanced forces. It then summarizes Newton's Three Laws of Motion - an object at rest stays at rest unless a force acts on it, force equals mass times acceleration, and for every action there is an equal and opposite reaction. The document also discusses friction, gravity, and how gravity depends on mass and distance from the object's center.

Uploaded by

AICKEN N. SAGA
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPT, PDF, TXT or read online on Scribd
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Force and Motion

Physical Science
Forces and Motion

 Forces can create


changes in motion
(acceleration or
deceleration).
Definition of a Force

A force is a
push or a pull.
Balanced Force

 A force that
produces no
change in an
object’s motion
because it is
balanced by an
equal yet
opposite force.
Unbalanced Forces
Are forces that
result in an
+
object’s
motion being
changed.
Motion can be described
as:
A change in an
object’s position.
Newton’s 1ST Law of
Motion
 1st Laws States that an  Ex. This law explains why
object at rest will remain at you fly forward in a car
rest and an object in motion when someone slams on
will remain in motion, the brakes. Because of
unless an outside force acts Inertia, your body wants to
on it (such as friction). This keep moving at the same
law is also called the LAW speed as the car.
OF INERTIA.
Newton’s 2nd Law of
Motion
 2nd Law States that a  Ex. This law
force on an object will explains why a golf
move the object in the
direction of the force.
ball will roll in the
The relationship direction of a force
between force, mass applied to it.
and acceleration is
summarized by the
formula:
 f = ma
Q: The frog leaps from its resting position at the
lake’s bank onto a lily pad. If the frog has a mass
of 0.5 kg and the acceleration of the leap is 3 m/s2,
what is the force the frog exerts on the lake’s
bank when leaping?

(A) 0.2 N
(B) 0.8 N
(C) 1.5 N
(D) 6.0 N

Formula chart says F=ma, m is mass


in kg, a is acceleration in m/s2.
So, .5 kg x 3 m/s2= 1.5 N
Newton’s 3rd Law of
Motion
 3rd Law States that
for every action
there is an equal but
opposite action.
 Ex. A skater pushes
back on the skates
but the skater moves
forward.
 THESE LAWS EXPLAIN ALL MOTION
Q: The hands of a swimmer
pushing backward against
water represent an action
force. What is the reaction
force?
A. The swimmer’s body moving forward?
B. The water pushing against the swimmer’s hands
C. The swimmer’s body pushing against the water.
D. The water moving backward from the swimmer.
Friction

A force that opposes, or works


against, motion of two objects that
are touching.
Friction
• Friction causes an
object to slow down
and stop.
• Since the amount of
energy stays constant,
the energy becomes
heat.
Universal Law of Gravity

All objects in
the universe
attract each
other by the
force of
gravity.
Universal Law of
Gravity

Gravity varies depending


on two factors:
1) the mass of the object
doing the pulling, and
2) the distance from the center
of that object
On Earth gravity = 9.8 m/s/s

For every
second that an
object falls its
speed increases
by 9.8 m/s

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