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# Motion and Forces #1

### Speed, velocity, acceleration

If the force acting upon an object increases, what happens to the object's acceleration? The acceleration will also increase.
How does the mass of an object affect its acceleration? If the force is constant, the greater the mass, the less the acceleration.
What force keeps an object moving in a circle? Centripetal force
In what direction does centripetal force act? Toward the center of the circle
What force is needed to accelerate an object 5 m/s/s if the object has a mass of 10 kg? A force of 50 newtons is needed.
A girl pulls a wheeled backpack with a force of 3 N. If the backpack has a mass of 6 kg, what is its acceleration? .5 m/s/s
A boy pushes a shopping cart with a force of 10 N, and the cart accelerates 1 m/s/s. What is the mass of the cart? 10 kg
Explain the difference between balanced and unbalanced forces. Balanced forces do not change an object's motion; unbalanced forces do change an object's motion.
What is inertia? Inertia is an object's resistance to a change in it's motion.
How is the inertia of an object related to its mass? Inertia is equal to the mass of an object.
State Newton's First Law of Motion. An object at rest will remain at rest, and an object in motion will remain in motion with the same velocity, unless acted upon by an unbalanced force.
State Newton's Second Law of Motion. The acceleration of an object increases with increased force, and decreases with increased mass.
State Newton's Third Law of Motion. For every action there is an equal but opposite reaction.
What is the definition of force? A push or a pull
What is net force? The overall force acting on an object when all the forces are combined.
What is position? The location of an object or place
What is a reference point? A location to which you compare other locations
What is motion? The change in position over time
What is speed? A measure of how fast something moves or the distance it moves, in a given amount of time
How is speed calculated? Speed = distance/time
If you travel 100 m in 50 s, what is your speed? 2m/s
What is velocity? Speed in a specific direction
What is a vector? A quantity that has both size and direction
Give 2 examples of a vector. velocity, acceleration, force
What is acceleration? The rate at which velocity changes with time
Name 3 ways that an object can accelerate. speeding up, slowing down, or changing direction
How is acceleration calculated? Acceleration = final velocity - initial velocity / time
What is the standard unit for acceleration? meter per square second
What is the standard unit of mass in the metric system? the kilogram
How is weight different than mass? Weight depends on location. Mass is constant.
If you weighed 60 pounds on Earth, what would you weigh on the moon? 10 pounds
What is the correct order of the technological design process? Identify the challenge, propose designs, choose a design, build it, test the product, evaluate it
What is the standard unit of weight in the metric system? The newton