4.5.6 Forces and Motion (will come up) P2

Question 1

Does a distance quantity require a specific direction

Answer 1

No specific direction is required so that it is a scalar quantity

Question 2

Speed of sound

Answer 2

330m/s

Question 3

Human walking speed

Answer 3

1.5m/s

Question 4

Human running speed

Answer 4

3m/s

Question 5

Human cycling speed

Answer 5

6m/s

Question 6

Why can an object travelling at a constant speed in a circle not have a constant velocity

Answer 6

Speed is a scalar quantity
Velocity is a vector quantity which means it can only be constant if the direction is constant
In circular motion, the direction is continuously changing

Question 7

How can speed be calculated from a distance-time graph

Answer 7

The speed is equal to the gradient of the graph

Question 8

What must be done to calculate speed at a given time from a distance-time graph for an accelerating object

Answer 8

Drawing a tangent to the curve at the required time

Calculating the gradient of the tangent

Question 9

Acceleration units

Answer 9

m/s^2

Question 10

How can distance travelled by an object be calculated from a velocity-time graph

Answer 10

Equal to the area under the graph

Question 11

What can be said about the resultant force acting on an object when it is falling at terminal velocity

Answer 11

The resultant force is 0

When at terminal velocity, the object is moving at a constant speed and so isn’t accelerating