Physic 21-30

Question 1

1. What is a Scalar?

Answer 1

A quantity with a magnitude only.

Question 2

2. What is a Vector ?

Answer 2

A quantity with both magnitude and
direction.

Question 3

3. What is the difference
   between velocity and
   speed?

Answer 3

Speed is a scalar and velocity is a
vector.

Question 4

4. What does the gradient
   of a distance time graph tell
   you?

Answer 4

The speed of the object.

Question 5

5. What does the gradient
   of a velocity time graph tell
   you?

Answer 5

The acceleration of the object.

Question 6

6. What does the area
   under a velocity time graph
   tell you?

Answer 6

The total displacement travelled by the
object.

Question 7

7. What lab equipment can
   you use to measure the
   speed of an object?

Answer 7

Light gates or stopwatch to measure the
time and a ruler or tape measure to
measure distance travelled.

Question 8

8. Name three contact
   forces.

Answer 8

Reaction, Tension, Drag, Friction, thrust,
Upthrust.

Question 9

9. How do you calculate the
   resultant force of parallel
   forces?

Answer 9

Add them if they are in the same
direction, subtract them if they are in
opposite directions.

Question 10

10. What is Newton’s first
    law?

Answer 10

If the forces on an object are balanced,
the object remains at a constant velocity
(steady speed in a straight line).