Forces Motion And Energy: Chapter 2, Forces In Motion
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Practice quiz for Holt Science and Technology: Forces Motion and Energy: Chapter 2, Forces in Motion
- 1.Which falls faster if there is no air resistance?
- A.
Heavier objects
- B.
Bigger objects
- C.
All ojects fall at the same speed
- 2.
- A.
Newton
- B.
Galileo
- C.
Aristotle
- 3.All objects accellerate toward the earth at __________.
- A.
9.8 meters per second
- B.
8.9 Meters per second per second
- C.
9.8 meters per second per second
- 4.
- A.
V = t - g so 10s - 9.8m/s/s = .2 m/s
- B.
V = t /g so 10s/9.8m/s/s = 1.02 m/s
- C.
V = t x g so 10s x 9.8m/s/s = 98 m/s
- 5.If you were to drop a feather and a marble right now, the marble will fall fall faster. Why?
- A.
Air resistance
- B.
The marble is heavier
- C.
The feather is from a bird and birds fly
- 6.Air resistance is a kind of _______.
- A.
Sliding friction
- B.
Fluid friction
- C.
Rolling friction
- 7.How would you calculate the force acting on a falling object?
- A.
The force of gravity multiplied by the force of air resistance
- B.
The force of gravity divided by the force of air resistance
- C.
The force of gravity minus the force of air resistance
- 8.define terminatl velocity
- A.
When something falls at a constant rate because the downward force of gravity equals the upward force of air resistance
- B.
the velocity of a train as it passes the terminal
- C.
The velocity of an object after it has come to rest on the ground
- 9.What two factors determine the amount of air resistance.
- A.
Size and mass
- B.
Shape and mass
- C.
Size and shape
- 10.Why does an astronaut appear to loat inside the spacecraft?
- A.
The astronaut is weightless
- B.
Both the astronaut and the spacecraft are in free fall.
- C.
They are in outer space where there is no gravity
- 11.Define free fall.
- A.
When gravity is pulling an object down and no other forces are acting on it.
- B.
When something is falling out of an airplane
- C.
When something is falling, but it is weightless
- 12.define orbit.
- A.
When something is travelling in a straight path
- B.
When something is traveling in a curved path
- C.
When something is travelling in a circular or near circular path around something else.
- 13.What two motions combine to cause one object to orbit another?
- A.
Constant forward motion and free fall
- B.
Constant circular motion and free fall
- C.
Constant forward motion and constant circular motion
- 14.
- A.
When something is travelling in a circular or near circular path around something else.
- B.
The vibration of a projectile
- C.
The curved path an oject follows when it is thrown or propelled near the surface of the earth.
- 15.Projectile motion results from combining two motions. What are they?
- A.
Accelerating horizontal motion and constant vertical motion
- B.
Constant horizontal motion and vertical motion accelerating because of gravity
- C.
Free fall and accelerating horizontal motion
- 16.Which law is this: The accelleration of an object depends on the mass of the object and the force applied.
- A.
Newtons First Law of motion
- B.
Newton's second law of motion
- C.
Newton's third law of motion
- 17.Which law is this: Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
- A.
Newtons First law of motion
- B.
Newton's second law of motion
- C.
Newton's third law of motion
- 18.How does a rocket engine work and which of Newton's laws of motion is involved.
- A.
The rocket engine pushes gases downward so the gases push the rocket upward with an equal force. Newton's Third Law
- B.
The gases flying out of the rocket engine push against the ground. Newton's Second law.
- C.
Heat rises. Newton's First Law.
- 19.Which Law is this: An object at rest remains at rest and an object in motion remains in motion at a constant speed and in a straight line unless acted upon by an unbalanced force.
- A.
Newton's first law of motion
- B.
Newton's second law of Motion
- C.
Newton's third law of motion
- 20.If you were to throw a ball right now, why wouldn't it travel in a straight line forever?
- A.
Because unbalanced forces act on it.
- B.
Because of gravity and air resistance.
- C.
All of the above. Gravity and air resistance provide the unbalanced forces.
- 21.Define inertia.
- A.
The tendancy of all objects to resist any change in motion.
- B.
Change in speed over a period of time.
- 22.Between two objects, which will have more inertia?
- A.
The one with less mass
- B.
The one that is traveling faster
- C.
The one with more mass
- 23.What determines how much an object will accellerate?
- A.
The amount of force acting on the object
- B.
The mass of the object
- C.
Both the mass of the object and the force acting on it
- 24.How do you state Newton's second law mathematically? (a = accelleration; m = mass; f = force)
- A.
A = f x m
- B.
A = f / m
- C.
A = f + m
- D.
A = f - m
- 25.What is a second way of stating newton's second law mathematically?
- A.
F = m x a
- B.
F = m - a
- C.
F = m / a
- 26.Define momentum.
- A.
A property of a moving object that depends upon its mass and velocity.
- B.
The time it takes to stop a moving object
- C.
Inertia
- 27.Which has more momentum:
- A.
A 5 gram marble moving at 60 miles per hour
- B.
A 10 gram marble moving at 60 miles per hour
- C.
A 10 gram marble moving at 10 miles per hour
- 28.If one marble strikes another marble, some momentum wil be transfered from one to the other. What will happen to their combined momentum.
- A.
It will increase
- B.
It will decrease
- C.
It will stay the same
- 29.Which law do you use to answer the previous question?
- A.
The law of the conservation of momentum
- B.
Newton's first law of motion
- C.
Newton's second law of motion
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