Past Mistakes

There is no ________ ___________ from the ________ when the board tips.

reaction force, bank

Description of what happens to forces as someone climbs a ladder:

• Vertical reaction force from ground ________

• Friction force increases

• The _________force from the wall increases

• The weight ___ the ladder increases

increases, reaction, on

Definition of ‘elastic limit’ on a stress-strain curve

• If a material is stretched up to its elastic limit and released, it will ____ to its original shape.

return

A pair of equal and opposite turning forces is called a __________.

couple

To reduce uncertainty in the measurement of a wire clipped to a ruler, a student could ______the wire to the ruler to reduce _________error.

reduce, parallax

150N, _______

clockwise

C

The duration of flashes on a strobe should be as short as possible ________difference between the top and bottom of the object.

blurry, difference