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# Forces and Motion

### 8 Green Science

What were that 7 forces from "Carnival of Forces" 1. Gravitational Force-Earth 2. Tensional Force-Rubber band 3. Magnetic Force-Magnet 4. Buoyant Force-floats 5. Frictional Force-Friction 6. Applied Force-What you're doing to the object 7. Air Resistance (or air friction)-Something falling
What is a contact Force? A force were the agent touches the receiver (directly of indirectly).
What is a noncontact force? A force where the agent and receiver are not in touch with each other, but can exert a push of pull without any sort of physical contact.
Which two forces from "Carnival of Forces" were noncontact? 1. Gravity 2. Magnetic
What two factors affect the amount of air resistance on a falling object? 1. Weight 2. Surface Area
What are the four forces involved in flight and what direction are they pointing in? Lift Thrust Drag Weight
What is the difference between mass and weight? Mass is the amount of matter an object is made up of while weight is the amount of gravitational pull an object has
What are the units for mass and weight? mass: grams (g) of kilograms (kg) weight: newtons (N)
What devices do you use to measure mass and weight? mass: a balance weight: a scale
What does the Law of Universal Gravitation State? All objects in the universe attract each other through gravitational force. The size of the force depends on the masses of the objects and the distance between the objects.
What is static friction? An example? When a force is applied to an object but does not cause the object to move. Trying to push your house down the street.
What is kinetic friction? An example? Friction between moving surfaces. Sliding books across a tabletop.
What is rolling kinetic friction? Any thing that has wheels uses rolling kinetic energy (cars, skateboards, tricycles).
What is sliding kinetic friction? When anything slides, like moving a heavy piece of furniture by pushing it.
How do you find the net force of an object if the forces are acting in the same direction? Add all the forces together.
How do you find the net force of an object if the forces are acting in opposite directions? Subtract the smallest force from the greatest force.
What are balanced forces? When the net force on an object = 0.
What happens with an object if the forces on it are balanced? No acceleration.
What are unbalanced forces? When the net force on an object does NOT = 0.
What happens with an object if the forces on it are unbalanced? Will change the speed of direction (acceleration) of a moving object.
As the skydiver falls, the friction (air resistance) becomes equal to the downward pull of gravity. What term is used to describe this? Terminal Friction.
Newton's First Law of Motion is also known as the law of ______________? Inertia.
What does Newton's First Law state? An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
What does Newton's Second Law state? The force of an object is equal to its mass times its acceleration.
What does Newton's Third Law state? Whenever an object exerts a force on a second object the second object exert an equal and opposite force on the first object.
How does mass relate to inertia? The more mass an object has, the greater its inertia.
What is the Equation for Newton's Second law of motion? F = MA Force = Mass x Acceleration.
What is the equation for momentum? P = MV Momentum = Mass x Velocity.
What is the Law of Conservation of Momentum? The total momentum is never gained or lost, it stays the same. It is just transferred.
Created by: cupcake24
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