CAIE IGCSE Physics 1.7.2 Work Topic Practice

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Question 1

[Maximum number: 1]

A mass is lifted from rest on the ground to Y. There is no air resistance.

Figure for Question 1 — CAIE IGCSE Physics

P is the increase in gravitational energy of the mass.
Q is the kinetic energy of the mass at Y.
Which expression is equal to the mechanical work done on the mass?

A

P+Q

B

P-Q

C

Q-P

D

P×QP \times Q

Question 2

[Maximum number: 1]

Which situation involves no work being done and no energy being transferred?

A

a car skidding to a stop on a road

B

a crane lifting a load

C

a heavy load hanging from a strong bar

D

a student dragging a big box over a rough floor

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