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