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  1. Problems
  2. /Mechanics
  3. /Work, Energy and Power

Work, Energy and Power

Physics
+ Upload a Problem
More in MechanicsUnits and MeasurementMotion in a Straight LineRelative MotionVectors and Motion in a PlaneNewton's Laws of MotionFrictionWork, Energy and PowerMomentum and CollisionsCircular MotionGravitationRotational MotionElasticity and Mechanical Properties of SolidsPressure and FluidsFluid Flow, Bernoulli's Principle and ViscositySurface Tension and Capillarity
76 problems
Type:
1.
Answer, and give a reason. A stretched wire snaps.
High School (11–12) · Elasticity and Mechanical Properties of Solids, Work, Energy and PowerStemPy LabStemPy Lab
Easy
2.
A force rising steadily from zero to 120 N stretches a wire by 1.6 mm.
High School (11–12) · Elasticity and Mechanical Properties of Solids, Work, Energy and PowerStemPy LabStemPy Lab
Easy
3.
An aluminium wire (Y = 7.0 × 10¹⁰ Pa) and a rubber cord (Y = 4.0 × 10⁶ Pa) are each under a stress…
High School (11–12) · Elasticity and Mechanical Properties of Solids, Work, Energy and PowerStemPy LabStemPy Lab
Medium
4.
A copper wire 1.8 m long and 0.90 mm across carries a 45 N load.
High School (11–12) · Elasticity and Mechanical Properties of Solids, Work, Energy and PowerStemPy LabStemPy Lab
Easy
5.
Answer, and give a reason. Why is the gravitational potential energy of a satellite negative?
High School (11–12) · Gravitation, Work, Energy and PowerStemPy LabStemPy Lab
Easy
6.
A 25 kg instrument is lifted from the ground to 250 km up.
High School (11–12) · Gravitation, Work, Energy and PowerStemPy LabStemPy Lab
Medium
7.
How much work lifts an 800 kg payload from the Earth's surface to a height of 3R (that is, 4R from…
High School (11–12) · Gravitation, Work, Energy and PowerStemPy LabStemPy Lab
Medium
8.
Balls of 4.0 kg and 6.0 kg are 0.30 m apart.
High School (11–12) · Gravitation, Work, Energy and PowerStemPy LabStemPy Lab
Easy
9.
In a ballistic pendulum, a bullet stops inside a hanging block, which then swings up.
High School (11–12) · Momentum and Collisions, Work, Energy and PowerStemPy LabStemPy Lab
Medium
10.
A 1.5 kg ball moving at 5.0 m/s makes an elastic, off-centre collision with an identical ball at…
High School (11–12) · Momentum and Collisions, Work, Energy and PowerStemPy LabStemPy Lab
Hard
11.
An 8.0 g bullet is fired into a 1.6 kg block hanging on strings, and stays inside.
High School (11–12) · Momentum and Collisions, Work, Energy and PowerStemPy LabStemPy Lab
Hard
12.
A ball dropped from 1.6 m bounces back to 0.90 m.
High School (11–12) · Momentum and Collisions, Work, Energy and PowerStemPy LabStemPy Lab
Medium
13.
A 9.0 kg shell at rest bursts into two pieces of 3.0 kg and 6.0 kg.
High School (11–12) · Momentum and Collisions, Work, Energy and PowerStemPy LabStemPy Lab
Hard
14.
A 5.0 kg trolley moving east at 4.0 m/s meets a 3.0 kg trolley moving west at 6.0 m/s.
High School (11–12) · Momentum and Collisions, Work, Energy and PowerStemPy LabStemPy Lab
Medium
15.
A 0.25 kg ball moving at 2.2 m/s hits an identical ball at rest, head-on and elastically.
High School (11–12) · Momentum and Collisions, Work, Energy and PowerStemPy LabStemPy Lab
Easy
16.
A 3.0 kg ball moving at 5.0 m/s makes a head-on elastic collision with a 2.0 kg ball at rest.
High School (11–12) · Momentum and Collisions, Work, Energy and PowerStemPy LabStemPy Lab
Medium
17.
A motor with an efficiency of 75% lifts a 120 kg load at a steady 1.25 m/s.
High School (11–12) · Work, Energy and PowerStemPy LabStemPy Lab
Medium
18.
A 2.0 kW geyser heats water for 5 hours.
High School (11–12) · Work, Energy and PowerStemPy LabStemPy Lab
Easy
19.
A car moves at a steady 22 m/s against a resisting force of 650 N.
High School (11–12) · Work, Energy and PowerStemPy LabStemPy Lab
Medium
20.
A motor lifts a 450 kg load through 8.0 m in 20 s at a steady speed.
High School (11–12) · Work, Energy and PowerStemPy LabStemPy Lab
Easy
21.
A ball dropped from 1.8 m onto a floor bounces back up to 1.15 m.
High School (11–12) · Work, Energy and PowerStemPy LabStemPy Lab
Medium
22.
A small car is let go from rest on a smooth track at a height h, and runs round a vertical loop of…
High School (11–12) · Work, Energy and PowerStemPy LabStemPy Lab
Hard
23.
A 4.0 kg crate slides from rest 6.0 m down a slope at 35°.
High School (11–12) · Work, Energy and PowerStemPy LabStemPy Lab
Hard
24.
A 2.5 kg block is thrown along a floor at 7.0 m/s.
High School (11–12) · Work, Energy and PowerStemPy LabStemPy Lab
Medium
25.
A 0.60 kg bob hangs on a string 1.5 m long.
High School (11–12) · Work, Energy and PowerStemPy LabStemPy Lab
Medium
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