Science 10

Motion Questions

1. Sketch time-position graphs to describe the following motions.

a) an object starting from the reference point moves eastward for a while at a constant, medium speed

b) at a fast westward speed

c) at a slow eastward speed

d) an object starting from the reference point moves eastward for a while at a constant, medium speed but then pivots and heads back quickly to the reference point

e) an object starting from the reference point moves westward for a while at a constant rapid speed but then pivots and heads slowly back to the reference point but stops a bit short

f) an object starting from a point somewhat eastward of the reference point moves more to the east for a while at a constant rapid speed but then pivots and heads quickly back to the reference point but stops a bit short.

2. Sketch time-position graphs to describe the following motions.

a) an object starting from the reference point accelerates as it moves westward for a while

b) an object starting from the reference point accelerates as it moves eastward for a while

c) an object starting from the reference point decelerates as it moves eastward for a while

d) an object starting from the reference point decelerates as it moves westward for a while.

3. Create a time-position story graph for the following situation. An object starting from the reference point moves 10 m E in 5 seconds and then pauses for 3 seconds. It moves another 10 m E in 7 seconds before pausing again for 4 seconds. Finally, for 17 seconds, it moves back toward the reference point but stops 2 m short.

4. Find the average velocity (in m/s) of an object that:

a) moves 50 m in 37 s.

b) moves from a spot 3 m E to a spot 55 m E in 1.4 minutes.

c) moves eastward 0.6 km from a spot 5 m E in 0.4 hr. (By the way, where does the object end up?)

d) moves from a spot 20 m E to a spot 80 m W in 2.3 minutes.

e) moves from a spot 200 m E of the reference point to a spot just 10 m E of it in 0.25 hr.

5. a) What is the primary use of a t-p graph, i.e., what information about an object's motion do we get just by looking at the graph?

b) What secondary information about an object's motion can we get from the t-p graph?

6. a) What is the primary use of a t-v graph?

b) What about its secondary use?

7. a) Define: reference point.

b) Define: frame of reference.

8. a) How do we show positive motion on a t-p graph?

b) Where are westerly positions located on a t-p graph?

9. What is the distinction between a scalar and a vector?

10. An object moves from a spot 5 m E to a spot 30 m E in 40 s. Find its average velocity.

11. a) Use this data to plot a t-p graph.

Time (s): 1 2 3 4 5 6 7 8

Distance (m): 4 8 12 16 20 24 28 32

b) Find the slope.

12. a) Use this data to plot a t-p graph.

Time (s): 1 2 3 4 5 6 7 8

Distance (m): 1 4 9 16 25 36 49 64

b) Find the slope of the tangent at 5 s.

13. Change this t-p graph into the equivalent t-v graph

14. Sketch a t-p story graph for this situation: object starts from reference point and moves 12 m E in 20 s, pauses for 5 s, moves another 15 m E in 20 s, pauses for 10 s and then, in 25 s, hops back toward the reference but stops 2 m short.