Grade 10 Physics · Strand 1: Mechanics and Thermal Physics · Energy, Work, Power and Machines
Inclined Planes, Wedges and Screws
A short Grade 10 Physics lesson for the CBE curriculum, part of Mechanics and Thermal Physics: Energy, Work, Power and Machines. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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1. A wooden ramp 9.0 m long is used to load sacks of maize onto a lorry bed 1.5 m above the ground. Calculate the velocity ratio of the ramp.
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2. A screw jack has a pitch of 5.0 mm and a handle of radius 21 cm. Using \pi = 22/7, calculate its velocity ratio.
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3. Why does sharpening a panga make it cut more easily?
- A. It makes the blade longer compared with its thickness at the edge, which increases the velocity ratio
- B. It reduces the work needed to zero
- C. It lowers the velocity ratio so less distance is moved
- D. It increases friction between the blade and the crop
4. What is the name for the distance a screw advances along its axis in one complete turn?
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5. A ramp is made twice as long to reach the same height. Which statement is correct for an ideal, frictionless ramp?
- A. The velocity ratio halves and the effort needed doubles
- B. The velocity ratio doubles, the effort needed halves, and the effort moves twice as far
- C. The velocity ratio stays the same because the height is unchanged
- D. The velocity ratio doubles and the work done on the load is halved
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