 µ IB | Vectors + Scalars

10 quick questions

10 minutes maximum! (can you do it in 5?)

1. Which of these is a scalar quantity?

• A. displacement
• B. power
• C. velocity
• D. acceleration

2. Which of these is a vector quantity?

• A. pressure
• B. mass
• C. force
• D. time

3. A vector quantity has

• A. size only
• B. size and direction
• C. direction only
• D. neither size nor direction

4. A polar bear walks 8 km north searching for food, and then 5 kilometers south again. Which of these gives the total distance travelled and displacement of the bear at the end of the journey?

 Distance (km) Displacement (km) A 13 13 B 8 3 C 3 13 D 13 3

5+6. The polar bear does a second journey the next day, this time walking 3 km north and then 4 km east. 5.What is the total displacement of the bear from the start?

• A. 7 km
• B. 5 km
• C. 25 km
• D. 4 km

6. Which of the following arrows best describes the total displacement? 7+8. Two forces are acting on a point as shown in the diagram. 7. Which of these arrows best represents the resultant force on the point? 8. The magnitude of the resultant force is

• A. 40 N
• B. √40 N
• C. 8 N
• D. √8 N

9&10. A cannonball is fired at a velocity v from a cannon, at an angle of 250 to the horizontal. 9. The vertical component of the velocity is given by 10. If the horizontal velocity is found to be 20 m s-1, then the value of v is equal to 