Work, Force & Energy Worksheet-4
Multiple-Choice Question:
(A) Talcum powder (B) Oil (C) Cream
(A) Class-3 lever (B) Class-2 lever (C) Class-1 lever
a. The cutting edge of a knife is an example of a wedge.
b. A force cannot change the direction of a moving object.
c. Smooth surface such as ice produces less friction.
d. Oil is used to reduce the frictional force between two surfaces.
e. A lever in which the effort is located between the fulcrum and the load is known as class-3 levers.
f. It is easier to push an object on an inclined plane rather than lifting it directly.
Fill in the blanks:
Answer Key:
(11) (A)
(12) (C)
(13) a. True; b. False; c. True; d. True; e. True; f. True
(14) Frictional force/Friction