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- 1. Multiple Choice
A 2.0 kg rock is moving in a 0.5 m horizontal circle every 0.25 s. Which of the following does the rock experience?
no net force
a centripetal acceleration
only the acceleration of gravity
motion due only to its inertia
- 2. Multiple Choice
When dealing with an object in circular motion, the distance the object covers in one revolution is called the:
circumference.
radius.
tangent.
distance.
- 3. Multiple Choice
When dealing with circular motion, the time that it takes to make one revolution of the circle is called the:
rotation.
orbit.
period.
segment.
- 4. Multiple Choice
Why does an object experiencing uniform circular motion have an acceleration?
because it ir changing speed
because it is changing direction
because it is moving n a straight line
because it has mass
- 5. Multiple Choice
An object in uniform circular motion is always moving ________________ the circle.
away from
toward
parallel to
tangent to
- 6. Multiple Choice
In uniform circular motion, which two variables point toward the center of the circle?
the centripetal force and the acceleration
the velocity and the mass
the period and the mass
the time and the radius
- 7. Multiple Choice
Neglecting air resistance, how would the horizontal acceleration and velocity of the hammer change if the thrower releases the chain?
The horizontal acceleration and velocity of the hammer would be along the Vtang vector.
The horizontal acceleration and velocity of the hammer would be inward toward the thrower.
The horizontal acceleration and velocity of the hammer would be straight down by gravity.
The horizontal acceleration and velocity of the hammer would be continue in a circle.
- 8. Multiple Choice
A car moves with a constant speed of 17 m/s on a circular track of 200 m radius. Calculate the acceleration of the vehicle. HINT: a = V2 / R
1.45 m/s2
0.76 m/s2
1.98 m/s2
2.34 m/s2
- 9. Multiple Choice
A 250 kg motorcycle goes around a 20.0 m radius turn at 19.0 m/s. What is the centripetal force on the motorcycle? HINT: f = MV2 / R
2396.6 N
4512.5 N
5006.8 N
5656.7 N
- 10. Multiple Choice
The _______________________ supplies the centripetal force requirement for the car to move in a horizontal circle. Without it, the car would turn its wheels but would not move in a circle (as is the case on an icy surface).
friction force
centrifugal force
normal force
applied force
- 11. Multiple Choice
A ball was swung at constant speed in a horizontal circle on the top of a level lab table. Which of the following was the direction of the acceleration on the ball?
The acceleration was inward along the radius of the circle.
The acceleration was outward along the radius of the circle.
The acceleration was tangent to the circle in the direction of the ball's motion.
D.The acceleration was perpendicular to both the ball's motion and the tabletop.
- 12. Multiple Choice
What is “Centripetal Force”?
Centripetal Force is a force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.
Centripetal Force is the resistance to motion of one object moving relative to another.
Centripetal Force are attractive or repulsive forces between particles that are caused by their electric charges.
Centripetal Force is the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface.
- 13. Multiple Choice
Two trucks each have a mass of 3000 kg. The gravitational force between the trucks is 4.00 × 10-5 N. One truck is then loaded with 1000 kg of rock. What would be the new gravitational force between the two trucks? (G = universal gravitation constant = 6.67 10-11 Nm2/kg2
5.32 × 10-5 N
4.75 × 10-5 N
5.75.00 × 10-5 N
6.50 × 10-5 N
- 14. Multiple Choice
In this diagram, what do the red arrows represent?
the acceleration vector
the velocity vector
the centripetal force vector
the force of gravity
- 15. Multiple Choice
Which of the following statements is true?
As the Earth orbits the Sun, the Earth's acceleration vector is toward the Sun.
If the Moon suddenly broke free of its orbit around the Earth, it would crash into the Earth.
The International Space Station remains in Earth orbit because of its mass.
The Earth and Neptune take the same amount of time to make one orbit around the Sun.
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