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Chapter 13 SCIENCE TEST
Terms in this set (39)
a force that comes from gravity pulling down on any object with mass.
the English unit of force equal to 4.448 newtons.
the metric unit of force, equal to the force needed to make a 1 kg object accelerate at 1 m/s2.
a pulling force that acts in a rope, string, or other object.
a squeezing force that can act on a spring.
a force that always resists motion. The force two objects exert on each other when they make contact.
the friction force that resists the motion of an object moving across a surface.
the friction force that resists the motion between two surfaces that are not moving. Motionless; greater than kinetic force
the sum of all forces acting on an object.
combined forces that result in a zero net force on an object.
the state in which the net force on an object is zero.
the force that a surface exerts on an object that is pressing on it. Is always perpendicular to the surface
a diagram showing all the forces acting on an object.
result in a net force on an object that can cause changes in motion.
A push or a pull
The amount of matter in an object; does not change with different gravitational pulls; measured in grams/kilograms
Weight=mass times strength of gravity
Friction Rolling on an object
Three situations in which force is created
Muscles, moving matter (wind), massive objects (planets)
What are the units of force
Newtons and pounds
Does the MASS of an object change if the object is moved from one planet to another?
No because gravity only affects weight.
What does it means if the strength of gravity is 9.8 N per kg?
Each kg of mass weighs 9.8 N
What are devices or inventions designed to DECREASE friction?
Oil, ball bearings, magnetic levitation, water
What are five devices or inventions designed to INCREASE friction?
Tires, nails,cleated shoes, wood, rubber
If the force squeezing two surfaces together is DECREASED, the force of friction between the two surfaces will most likely what?
formula for mass
What is the difference between static friction and sliding friction?
Static friction occurs at rest and sliding friction occurs in motion
A vector is an example of a physical quantity that:
Includes information about quantity and direction
If an object is in equilibrium, it means:
The net force on the object is zero
If a force has a negative value, such as -100 N, that means the force:
Acts in the opposite direction from a +100 N force
A child weighing 200 N is sitting on a swing. The swing is supported by two ropes, one on each side. What is the tension in one of the ropes?
What information do you need to describe a force?
Size and direction
What happens to a springs force if you stretch it more?
Its force increases
Explain why ice generally has very little friction when it is in contact with other materials.
Because friction depends on the force between the surfaces
What four main forces act on an airplane in flight? If the plane accelerates forward, Which two forces must be out of balance? To fly on a level path, Which two forces must be in balance?
Drag (air resistance), lift, thrust, and weight. Drag and thrust. weight and lift
You and your friend pull on opposite ends of a rope, each eirh a force of 10 N. What is the tension in the rope?
What is the key things symbolize normal force of a box going downhill?
If the arrow is perpendicular at 90 degrees
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