Mechanism - Motion

Linear motion is a motion in a ________ line.

• bent

• straight

• curved

• short

Answer explanation

The word linear means it has to do with "line", especially a straight line.

In a linear motion, the object moves in ______ direction.

• one

• two

• multiple

• back and forth

Answer explanation

One direction means either forward or backward, or either upward or downward, but not both directions.

Which one is an example of a linear motion?

• pedals on a bike

• needle on a sewing machine

• pendulum of a clock

• car moving along a road

Answer explanation

The road resembles a straight line. The car moving on it shows a linear motion.

Reciprocating motion is a motion in a ________ line.

• bent

• straight

• curved

• short

Answer explanation

Similar to linear, reciprocating motion also follows a straight line path. However, there is a difference in terms of its direction.

In a reciprocating motion, the object moves in ______ direction.

• one

• many

• unknown

• back and forth

Answer explanation

Reciprocating is a back and forth motion. For example, the object continuously moves forward and backward repeatedly.

Which one is an example of a reciprocating motion?

• pedals on a bike

• needle on a sewing machine

• pendulum of a clock

• car moving along a road

Answer explanation

The needle of the sewing machine moves up and down repeatedly.

Rotary motion is a motion in a ________.

• line

• circle

• square

• wave

Answer explanation

Rotary is related to rotation. Rotary motion is often called a circular motion as well.

In a rotary motion, the object moves in ______ direction.

• one

• two

• many

• back and forth

Answer explanation

Rotary motion moves in one direction, either clockwise of anti-clockwise from where you see it.

Which one is an example of a rotary motion?

• pedals on a bike

• needle on a sewing machine

• pendulum of a clock

• car moving along a road

Answer explanation

The cyclist's feet rotate the pedals to move the bicycle.

Oscillating motion is motion about a pivot point in the ______ of a circle.

• centre

• arc

• diameter

• radius

Answer explanation

Oscillating is similar to rotary as it moves along a circular path (arc of a circle). However, there is a difference in terms of the direction.