Multiple Choice: Forces, Dynamics and Mechanics

Q1. What is the gravitational field strength at the Earth's surface?

Q2. Cog X has 16 teeth and cog Y has 8 teeth.

Cog X is turned around two times. How many times does cog Y turn around?

Q3. What is the smallest number of forces needed to bend an object?

Q4. The diagram shows the relationship between force and extension for a spring.

Which letter on the graph shows the elastic limit of the spring being stretched?

Q5. An object travelled 800m in 40 seconds.

What is the speed of the object?

speed = distance travelled/time taken

speed = 800 m/40 s

speed = 20 m/s

Q6. An object moved 20cm with a force of 20N.

Calculate the work done in moving the object.

work done (J) = force (N) x distance moved in the direction of the force (m)

work done = 20 N x 0.20 m

work done = 4.0 J

Q7. In which of the following situations does the force cause a rotation?

Q8. Which of the following is a scalar quantity?

Q9. Which distances are the same?

Q10. A student puts different weights on four balances.

Which balance will give a clockwise moment?