CSS - PMS - CCE - PCS - Everyday Science
Mechanics
An object starts at 0 m/s and accelerates at 1 m/s² for 2 s. Final velocity is:
A. 2 m/s
B. 3 m/s
C. 1 m/s
D. 4 m/s
Correct Answer: A
Use v = u + at.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Mechanical advantage is:
A. load divided by effort
B. effort divided by load
C. distance divided by time
D. power divided by force
Correct Answer: A
MA = load/effort.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Archimedes' principle says buoyant force equals:
A. volume of object
B. weight of displaced fluid
C. surface pressure only
D. mass of object
Correct Answer: B
Upthrust equals the weight of displaced fluid.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Pressure is:
A. distance per time
B. work per time
C. mass per volume
D. normal force per unit area
Correct Answer: D
P = F/A.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Density is:
A. volume per mass
B. mass per unit volume
C. weight per time
D. force per area
Correct Answer: B
ρ = m/V.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Power is:
A. mass per unit volume
B. force per unit area
C. distance per unit time
D. work done per unit time
Correct Answer: D
P = W/t.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Gravitational potential energy near Earth is:
A. mgh
B. Fd/t
C. 1/2 mv²
D. mv
Correct Answer: A
PE = mgh.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Kinetic energy is:
A. mgh
B. 1/2 mv²
C. mv
D. F/d
Correct Answer: B
KE = ½mv².
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Impulse equals change in:
A. density
B. momentum
C. mass
D. temperature
Correct Answer: B
Impulse equals Δp.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Linear momentum is:
A. force × distance
B. mass × acceleration
C. power × time
D. mass × velocity
Correct Answer: D
p = mv.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Newton's third law states forces occur as:
A. only fluids
B. only circular motion
C. equal pairs on the same body
D. equal and opposite pairs on different bodies
Correct Answer: D
Action-reaction forces act on different bodies.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Newton's second law is:
A. F = m/a
B. F = a/m
C. F = mv
D. F = ma
Correct Answer: D
Net force equals mass times acceleration.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Newton's first law is associated with:
A. electrolysis
B. refraction
C. radioactivity
D. inertia
Correct Answer: D
The first law describes inertia.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Acceleration is rate of change of:
A. force
B. velocity
C. mass
D. distance only
Correct Answer: B
a = Δv/Δt.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
Velocity differs from speed because velocity has:
A. no units
B. temperature
C. mass
D. direction as well as magnitude
Correct Answer: D
Velocity is a vector.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
The SI unit of pressure is the:
A. newton
B. tesla
C. joule
D. pascal
Correct Answer: D
Pressure is measured in pascals.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
The SI unit of power is the:
A. watt
B. volt
C. newton
D. joule
Correct Answer: A
Power is measured in watts.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
The SI unit of work and energy is the:
A. pascal
B. watt
C. newton
D. joule
Correct Answer: D
Work and energy are measured in joules.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
The SI unit of mass is the:
A. kilogram
B. pound
C. newton
D. gram
Correct Answer: A
Kilogram is the SI base unit of mass.
CSS - PMS - CCE - PCS - Everyday Science
Mechanics
The SI unit of length is the:
A. foot
B. kilometre
C. centimetre
D. metre
Correct Answer: D
Metre is the SI base unit of length.