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Mechanics (10 Cards)

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1
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You have average velocity and time. How do you find distance?

v(avg) = d/t

2
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A rock falls from rest a vertical diatance of 0.72 meters to the surface of a planet in 0.63 seconds. What formula would you use to find acceleration due to gravity on this planet?

d=v(initial)*t + 1/2*a*t^2

3
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Two rocks are launched horizonally off a cliff. One is launched at 30m/s, the other at 20m/s. Which hits the ground first?

Both hit at the same time.

4
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What are Newton's three laws?

1. An object at rest stays at rest, an object in motion stays in motion unless acted on by an unbalanced force.

2. The accleration of an object is proportional to the net force acting on that object and inversly proportional to it's mass. OR F=ma (this is not technically Newton's second law, but it comes from it).

3. Every force has another force equal in magintude and oposite in sense (direction).

5
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Object A has a velocity of 5m/s East and a mass of 3kg. Object B has a velocity of 3m/s West and a mass of 5kg. Compared to object A, object B has... (answer in relation momentum and inertia).

equal momentum and more inertia.

6
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Compared to the force of a spring at x meters from equilibrium, what is the force at 2x meters?

4 times greater

7
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Does increasing the velocity of an object or decreasing the radius of a turn increase the centripital force more?

Velocity

8
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What factors affect the force of friction between tow surfaces?

The types of surfaces and the force between them.

9
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Which did more work: Something lifting a 50kg object 100 meters in 5 seconds, or something lifting the same object 110 meters in 20 seconds?