20 Questions
| Attempts: 3165

Questions and Answers

- 1.On a position-time graph, a changing velocity is represented by a straight line.
- A.
True

- B.
False

- 2.Calculate the distance (in km) that Charlie runs if he maintains an average speed of 8 km/hr for 1 hr.
- 3.Speed is
- A.
A measure of how fast something is moving.

- B.
The distance covered per unit time.

- C.
Always measured in terms of a unit of distance divided by a unit of time.

- D.
All of the above

- 4.Calculate the distance you will travel if you maintain an average speed of 10 m/s for 40 seconds.
- 5.Acceleration describes
- A.
Any change in velocity.

- B.
An object that is speeding up.

- C.
An object that is slowing down.

- D.
An object that is changing direction.

- E.
All of the above

- 6.Calculate the speed of a bowling ball that moves 8 meters in 4 seconds.
- 7.As a ball falls freely, the distance it falls each second is the same.
- A.
True

- B.
False

- 8.Calculate the acceleration of a bus that goes from 10 km/h to a speed of 50 km/h in 10 seconds.
- 9.If an object moves from one position to another, it is
- A.
Accelerating

- B.
Moving

- C.
Speeding

- D.
In free fall

- 10.Calculate the speed (in m/s) of a skateboarder who accelerates from rest for 3 seconds down a ramp at an acceleration of 5 m/s
^{2}. - 11.Calculate the vertical distance an object dropped from rest would cover in 12 seconds if it fell freely without air restistance.
- 12.An apple drops from a tree and hits the ground in 1.5 seconds. Calculate how far it falls.
- 13.Calculate the acceleration of a ball that starts from rest and rolls down a ramp and gains a speed of 25 m/s in 5 seconds.
- 14.Objects in free fall are only influenced by gravity, not by air resistance.
- A.
True

- B.
False

- 15.Calculate the instantaneous speed (in m/s) at the 10-second mark for a car that accelerates at 2 m/s
^{2}from a position of rest. - 16.Elapsed time is the time that passes from the beginning to the end of a fall.
- A.
True

- B.
False

- 17.Calculate your average walking speed when you step 1 meter in 0.5 seconds.
- 18.When you look at the speedometer in a moving car, you can see the car's
- A.
Instantaneous speed

- B.
Average speed

- C.
Instantaneous acceleration

- D.
Average acceleration

- E.
Average distance traveled

- 19.Suppose you take a trip that covers 240 km and takes 4 hours. Your average speed is
- A.
480 km/h.

- B.
240 km/h.

- C.
120 km/h.

- D.
60 km/h.

- 20.A position-time graph of constant velocity will show a
- A.
Straight line.

- B.
Curved line.

- C.
Wavy line

- D.
Distorted line

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