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Motion Test

8th Grade Earth Science

QuestionAnswer
Forces are caused by ___________________ . an accelerated mass
Unbalanced forces cause objects to _________________ . move
Objects moving through the sky always encounter which type of force? air resistance
If you throw a baseball with your hand, which type of force did you exert on the ball to get it to move? applied
A box sitting on a counter has two forces acting on it, gravity (weight) and ______________ . normal
What property of matter is the tendency for a moving object to stay moving and an object at rest to stay at rest? inertia
The gravitational force between two objects is determined by distance between the objects and their ____________ . masses
What is the difference between speed and velocity? Velocity includes direction, speed does not.
What is the definition of momentum? This is determined by how fast a mass is moving.
What is the definition of velocity? This is determined by how far an object has traveled in a certain amount of time.
What is the definition of acceleration? This is determined by a change in how fast an object is traveling over a change in time.
If distance (Y-axis) is graphed vs time (X-axis), the slope of the line equals the ________________ . speed
A bowling ball and a tennis ball are rolling down the hill at the same time. Explain the momentum of the balls. The bowling ball has a greater momentum because it has more mass.
A small marble moving North collides with a stationary small marble. Explain what happens after they collide. They will have the same total momentum before and after the collision.
What is momentum and how do you calculate it? Momentum is a calculation of a mass traveling at a certain velocity. Momentum (p)= mass x velocity
What is acceleration and how do you calculate it? Acceleration occurs when there is a change in velocity over a period of time. Acceleration = speed2 - speed1 / time
What is the difference between balanced and unbalanced forces? Balanced forces are forces that are acting on an object that combine to equal a net force of zero. Unbalanced forces are forces that combine to produce a net force NOT equal to zero.The result = movement
How do you calculate force? Force = mass x acceleration F = ma
How do you calculate the net force on an object? Net Force is the combination of all the forces acting on an object. To find it, add together all the forces working on the object.
What is Newton's 1st Law of Motion and how does it apply to real-world situations? Inertia- the tendency for an object to stay in motion or stay at rest. Ex. pressing the break in a car and springing forward
What is Newton's 2nd Law of Motion and how does it apply to real-world situations? Force ~An object acted upon by a force will accelerate in the direction of the force. ~ Ex. a person falling out of a plane is falling in the direction of the force, gravity, downward
What is Newton's 3rd Law of Motion and how does it apply to real-world situations? Action/Reaction For every action (force) there is an equal reaction (force) in the opposite direction. forces act in pairs EX. When you push on the wall, the wall pushes back on you with an equal amount of force. this is how rockets work
Describe tensional, compressional, and extensional. Compression- pushed together Extension- stretching out Tensional- pulled in two directions but includes the transfer of forces or a change in direction
What are the 4 fundamental forces of nature that all other forces are derived from? strong, electromagnetic, weak, gravitational
Describe mass and weight on Earth vs. the Moon. The mass of a person is the same on Earth and on the Moon. But, the Moon has less gravitational force so the weight of a person is less on the Moon than on Earth.
Created by: *BROOKE*
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