Physics (motion)

Question 1

Vector quantities-

Answer 1

Quantities that have both size and direction

Question 2

Scalar quantities-

Answer 2

Quantities that do not have a direction.

Question 3

Displacement-

Answer 3

The distance covered in a straight line, and had a direction. The displacement at the end of a journey is usually less than the distance travelled because of the turns or bends in the journey.

Question 4

Velocity-

Answer 4

Is speed a particular direction.

Question 5

Examples of vector qualities-

Answer 5

Force, velocity, displacement, weight, acceleration, momentum, etc.

Question 6

Examples of scalar quantities-

Answer 6

Speed, distance, mass, energy, temperature, time, etc.

Question 7

(Average) speed (m/s)=

Answer 7

Distance(m) divided by time taken (s)

Question 8

Distance traveled (m)=

Answer 8

Average speed (m/s) x time (s)

Question 9

Acceleration-

Answer 9

The change in velocity in a certain amount of time.

V-U
A= ———
T

Question 10

Distance/time graphs

Answer 10

1. Horizontal lines mean the object is stationary (its distance from the starting point is not changing)
2. Straight, sloping lines mean the object is travelling at constant speed.
3. The steeper the line, the faster the object is travelling at constant speed.
4. The speed is calculated from the gradient of the line.

Question 11

Constant/ uniform acceleration means constant acceleration.

Answer 11

V2 - U2 = 2 x a x X

Finally velocity - initial velocity = 2 x acceleration x distance

Question 12

Gradient-

Answer 12

Change in the vertical divided by change in the horizontal.

Question 13

Velocity/time graphs.

Answer 13

1. Gradient = acceleration, since changed over time can be plotted on a velocity/time graph.
2. Flat sections represent a steady speed.
3. The Steele the graph, the greater the acceleration or deceleration.
4. Uphill sections are acceleration.
5. Downhill sections are deceleration.
6. A curve means changing acceleration.