Forces and Machines document discusses different types of forces including gravity, magnetism, and contact forces. It explains that a force is a push or pull that causes an object to move or change, and greater forces are needed to move heavier objects or make them move faster. Gravity pulls objects toward the center of the Earth. Magnetism is the force produced by magnets that causes attraction or repulsion between poles. Machines are tools that make work easier using simple machines like levers, pulleys, inclined planes, screws, wheels and axles, and wedges.
force, pull, push, magnetic force, frictional force, direction, formula mass x acceleration, a vector quantity, magnitude, types of forces, muscular force, speed, shape, force, size, unit, newton, position, moving object, assignments1, assignment2
force, pull, push, magnetic force, frictional force, direction, formula mass x acceleration, a vector quantity, magnitude, types of forces, muscular force, speed, shape, force, size, unit, newton, position, moving object, assignments1, assignment2
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For other uses, see Force (disambiguation). "Physical force" redirects here. For other uses, see Physical force (disambiguation).
In physics, a force is an influence that can cause an object to change its velocity, i.e., to accelerate, meaning a change in speed or direction, unless counterbalanced by other forces. The concept of force makes the everyday notion of pushing or pulling mathematically precise. Because the magnitude and direction of a force are both important, force is a vector quantity. The SI unit of force is the newton (N), and force is often represented by the symbol F.
Force
Forces can be described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate.
Common symbols
�
→
{\displaystyle {\vec {F}}}, F, F
SI unit
newton (N)
Other units
dyne, pound-force, poundal, kip, kilopond
In SI base units
kg·m·s−2
Derivations from
other quantities
F = ma
Dimension
�
�
�
−
2
{\displaystyle {\mathsf {M}}{\mathsf {L}}{\mathsf {T}}^{-2}}
Force plays a central role in classical mechanics, figuring in all three of Newton's laws of motion, which specify that the force on an object with an unchanging mass is equal to the product of the object's mass and the acceleration that it undergoes. Types of forces often encountered in classical mechanics include elastic, frictional, contact or "normal" forces, and gravitational. The rotational version of force is torque, which produces changes in the rotational speed of an object. In an extended body, each part often applies forces on the adjacent parts; the distribution of such forces through the body is the internal mechanical stress. In equilibrium these stresses cause no acceleration of the body as the forces balance one another. If these are not in equilibrium they can cause deformation of solid materials, or flow in fluids.
In modern physics, which includes relativity and quantum mechanics, the laws governing motion are revised to rely on fundamental interactions as the ultimate origin of force. However, the understanding of force provided by classical mechanics is useful for practical purposes.[1]
Development of the concept
Pre-Newtonian concepts
Newtonian mechanics
Combining forces
Examples of forces in classical mechanics
Concepts derived from force
Units
Revisions of the force concept
Fundamental interactions
See also
References
External links
Last edited 18 days ago by HansVonStuttgart
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2. FORCES AND WORK
• A force is a push or a pull that makes
an object do something. For example
when you kick a ball, the force of your
kick makes the ball move.
3. • An object moves faster when
we apply more force.
• We need to apply more force
when we move a heavier object.
• We use forces any time we
push, pull or lift objects.
4.
5. DIFFERENT TYPES OF FORCES
GRAVITY
• When you jump up in the air, you drop
back down again. This is because
there’s an invisible force pulling you
down to the ground. This force is
called gravity.
• Gravity is the force that keeps you on
the ground.
• Without gravity, everything will float
into space.
6. Magnetism
• Magnetism is the force that magnets
produce.
• A magnet is a piece of metal that can
pull some other type of metal towards
it.
• Magnets have two ends. These are
called the north pole and the south
pole.
7. Magnetic attraction
• A north pole and a south pole always
pull towards each other. This is called
magnetic attraction.
• Two poles of the same type always
push each other away. This is called
magnetic repulsion.
8. Contact forces
• A contact force is a force between two
objects that are touching.
• Contact forces occur when one object
applies a force to another object.
9. Match the sentences
• A force is …. • …we apply a force.
• An object moves • …the center of the
when… Earth.
• Magnetism is the …. • …a pull or a push.
• Gravity pull objects • …force that magnets
towards… produce.
10. MACHINES
• A machine is a tool used to make work
easier.
• COMPLEX MACHINES are two or more
simple machines working together. The
have lots of moving parts.
• A bicycle is a complex machine.
11.
12. Simple machines
• LEVER
A lever is a bar that moves on a point called
fulcrum. Moving the fulcrum changes the
weight of the object.
13. PULLEY
A pulley is a wheel with a rope. It changes
the direction of a pulling force. Pulling
down on the rope lifts the object on the
other end.
14.
15. INCLINED PLANES
An inclined plane is a sloping surface, such
as a ramp. Incline planes can reduce the
force needed to move something.
