3rd Year
Gravity, Force and Levers
Q3
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Teacher Name:
Class:
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2. SAVE the completed assessment as instructed by your teacher.
a) Levers are used in many places in our everyday lives.
Use an arrow in both of the pictures above to indicate the fulcrum of the lever.
(This part of the question cannot be completed on-line. You can either print the page or answer it in your copybook.)
Explain why or how the nail puller is a lever.
The diagram below shows two persons on a seesaw.
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Gravity, Force and Levers - Page 1 of 5
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Gravity, Force and Levers
Q3
Calculate the clockwise moment of force – Person A side.
Calculate the anticlockwise moment of force – Person B side.
Explain why this see saw is horizontal.
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Gravity, Force and Levers
Q3
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b) A student used a meter stick suspended from a retort stand and a 300 g mass to find the mass of
a small stone.
Draw a diagram showing how the experiment was set up.
(This part of the question cannot be completed on-line. You can either print the page or answer it in your copybook.)
What readings did the student need to take?
Write the formula/calculation the student used to find the mass of the stone.
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Gravity, Force and Levers
Q3
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c) This is a drawing of a steel balance used in ancient times to find the mass of a bucket of potatoes.
Calibrated Scale
Sliding Known Mass
Container To Hold Potatoes
Show, using an arrow, where is the fulcrum in this balance.
(This part of the question cannot be completed on-line. You can either print the page or answer it in your copybook.)
How do you think the shopkeeper used this balance to find the mass of the potatoes?
d) Why is it easier to turn a nut by using a spanner than just by using your fingers?
Why is a door handle on the opposite side of a door to the hinges?
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Gravity, Force and Levers
Q3
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Why is it usually easier to open the car door when you are outside the car than when you are
seated inside the car?
e) You are able to exert a force of 300 N. Use a diagram to show how you would set up a crowbar to
lift a rock which has a weight of 3000 N?
(This part of the question cannot be completed on-line. You can either print the page or answer it in your copybook.)
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Gravity, Force and Levers - Page 5 of 5
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