Force and Torque Flashcards
7 cards from real Bennett Mechanical Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Force and Torque flashcards as text
A uniform plank rests on a pivot at its center. Adding weight to one end will cause that end to:
Answer: Tip downward
Extra weight creates a larger torque on that side, tipping it down.
Which combination produces the greatest torque?
Answer: Large force, long lever arm
Torque is force times distance, so the largest force on the longest arm gives the most torque.
A wheelbarrow makes lifting easier because the load sits:
Answer: Close to the wheel pivot, shortening the load arm
Placing the load near the wheel reduces its lever arm, so less effort is needed at the handles.
If the net torque on a stationary object is not zero, the object will:
Answer: Begin to rotate
An unbalanced torque causes rotational acceleration, so the object starts turning.
A bolt requires 18 N·m of torque. A wrench applies 90 N of force. What handle length is needed?
Answer: 0.2 m
Length equals torque divided by force, so 18 ÷ 90 = 0.2 m.
Pushing a revolving door at the edge rather than near the center is easier because the edge gives:
Answer: A longer lever arm
The edge is farther from the central axis, producing more torque for the same push.
Two opposing torques of 15 N·m and 10 N·m act on a wheel. The net torque is:
Answer: 5 N·m in the direction of the larger torque
Opposing torques subtract, leaving 15 − 10 = 5 N·m toward the larger one.