Forces
A force used to make objects come closer to us.
Pull
Friction __________ motion.
Resists
You are pushing down on a marshmallow using your fingers. The marshmallow is going through which internal force?
Compression
Sliding backwards on a skating rink when you push off the boards is an example of what?
Reaction Force
Gravitational Force, Magnetic Force, and Electric Force are all examples of what?
Non-Contact Forces
A force exerted by magnets when they attract or repel each other.
Magnetic force
Trevor is playing pool. He accidentally knocks the black 8 ball towards one of the pockets which would cause him to lose. Trevor hopes that what type of friction will be enough to stop the ball?
Rolling Friction
The particles in a material are resisting being pulled apart. This substance is under what?
Tension
A person hitting a ball with a bat is an example of what?
Action Force
A force pulling objects down to earth’s surface is called?
Gravitational Force
These types of forces are caused by two objects touching.
Contact Forces
Spring/Elastic Force
Peter is trying to open a jar. The jar is experiencing what internal force?
Torsion
If you punch a solid object with 50 kg of force, how much force will the object apply back to your hand?
50 kg
When an object is deformed by a force and does not go back to its original shape when the force is removed, this is known as what?
Plasticity
Forces that act on the outside of an object are known as what?
External Forces
What are the three types of friction?
Static Friction, Sliding Friction, and Rolling Friction.
Describe what happens to an object when it is experiencing shear force.
The object is being pushed in opposite directions.
Which scientist discovered the 3 laws of motion?
Isaac Newton
A bow and arrow uses the bow's _____________ to shoot arrows over and over again.
Elasticity
This type of exerted force starts an object's motion or changes its direction.
Applied Force
The more you compress or stretch a spring, the more ______________ ______________ it has. When released, this creates spring force.
Potential Energy
Bending is an internal force made up of two other internal forces. Describe these forces and how they combine to create bending.
Tension and Compression. The part of the bent object that becomes the "inside" of the bend becomes compressed. The "outside" of the bend undergoes tension.
What is Newton's Third Law of Motion?
For every action there is an equal and opposite reaction.
Why is it important to think about internal forces when designing structures?
Internal forces must be strong enough to withstand external forces. If the external force is stronger than the internal force of the structure, the structure will move and could fail or break.