42 Questions
| Attempts: 827

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Questions and Answers

- 1.Science is a body of knowledge that
- A.
Condenses knowledge into testable laws

- B.
Describes order in nature

- C.
Is an ongoing activity of humans

- D.
All of the above choices are correct

- E.
None of the above choices are correct

- 2.As an object freely falls downward, its
- A.
Acceleration increases

- B.
Velocity increases

- C.
Both of these

- D.
None of these

- 3.A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that
- A.
The milk carton has inertia

- B.
The milk carton has no acceleration

- C.
There is an action-reaction pair of forces

- D.
Gravity tends to hold the milk carton secure

- E.
None of these

- 4.The gain in speed each second for a freely-falling object is about
- A.
0

- B.
20 m/s

- C.
5 m/s

- D.
10 m/s

- E.
Depends on the initial speed

- 5.A package falls of a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is
- A.
More than 30 m/s

- B.
Zero

- C.
Less than 30 m/s but larger than zero

- D.
About 30 m/s

- E.
More information is needed for an estimate

- 6.According to Newton's law of inertia, a rail road train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains.
- A.
Are much too heavy

- B.
Move too slowly

- C.
Must go up and down hills

- D.
Always have forces that oppose their motion

- 7.A scientific statement that can never be changed is a scientific
- A.
Principle

- B.
Theory

- C.
Hypothesis

- D.
Law

- E.
None of the above choices are correct

- 8.If no external forces are acting on a moving object it will
- A.
Continue moving at the same velocity

- B.
Move slower and slower until it finally stops

- C.
Continue moving at the same speed

- 9.Galileo's use of inclined planes allowed him to effectively
- A.
Eliminate the acceleration of free fall

- B.
Increase the acceleration beyond that of free fall

- C.
Slow down the acceleration of free fall

- D.
Eliminate friction

- 10.The two measurements necessary for calculating average speed are
- A.
Distance and acceleration

- B.
Velocity and distance

- C.
Acceleration and time

- D.
Velocity and time

- E.
Distance and time

- 11.A horse gallops a distance of 10 kilometers in a time of 30 minutes. It's average speed is
- A.
15 km/h

- B.
30 km/h

- C.
20 km/h

- D.
40 km/h

- 12.A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval it acceleration is
- A.
Zero

- B.
1000 km/hr

- C.
110 km/hr

- D.
10 km/hr

- 13.A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected the force required to keep the puck sliding at constant velocity is
- A.
Equal to its weight divided by its mass

- B.
Zero

- C.
Equal to the product of its mass times its weight

- D.
Equal to its weight

- 14.Twelve seconds after starting from rest, an object falling freely will have a speed of
- A.
50 m/s

- B.
100 m/s

- C.
10 m/s

- D.
More than 100 m/s

- 15.If an object moves with constant acceleration, its velocity must
- A.
Be constant also

- B.
Change by the same amount each second

- C.
Always decrease

- D.
Change b varying amounts depending on its speed

- 16.A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
- A.
Opposite its velocity

- B.
Directed downward

- C.
In the direction of motion

- D.
Directed upward

- 17.If a car accelerates form rest at 2 meters per second per second, its speed 3 seconds later will be about
- A.
2 m/s

- B.
6 m/s

- C.
4 m/s

- D.
3 m/s

- 18.At on instant an object in free fall is moving downward at 50 meters per second. One second later is speed should be about
- A.
25 m/s

- B.
100 m/s

- C.
55 m/s

- D.
60 m/s

- E.
50 m/s

- 19.Starting from rest, the distance a freely-falling object will fall in 1.0 second is about
- A.
10 m

- B.
2.00 m

- C.
5.0 m

- D.
None of the above

- 20.An object falls freely from rest on a planet where the acceleration due to gravity is 20 meters per second squared. After 5 seconds, the object will have a speed of
- A.
20 m/s

- B.
10 m/s

- C.
50 m/s

- D.
5 m/s

- E.
100 m/s

- 21.If you drop an object, it will accelerate downward at a rate of 9.8 meters per second per second. If you instead throw it downwards, its acceleration (in the absence of air resistance and after it leaves your hand) will be
- A.
Greater than 9.8 meters per second per second

- B.
Less than 9.8 meters per second per second

- C.
9.8 meters per second per second

- 22.If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about
- A.
2 seconds

- B.
20 seconds

- C.
10 seconds

- D.
1 second

- E.
Not enough information to estimate

- 23.When a rock thrown straight upwards gets tot he exact top of its path, its
- A.
Velocity is zero and its acceleration is zero

- B.
Velocity is about 10 m/s and its acceleration is zero

- C.
Velocity is zero and its acceleration is about 10 meters per second per second

- D.
Velocity is about 10 m/s and its acceleration is about 10 meters per second per second

- E.
None of these

- 24.A ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds?
- A.
About 80 m/s

- B.
About 60 m/s

- C.
About 110 m/s

- D.
About 100 m/s

- E.
About 50 m/s

- 25.Which has a greater mass?
- A.
An automobile battery

- B.
A king-size pillow

- C.
Neither- both have the same

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