Forces

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Flashcards on Forces, created by jtrow on 09/05/2013.
jtrow
Flashcards by jtrow, updated more than 1 year ago
jtrow
Created by jtrow almost 11 years ago
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Question Answer
Which of these is the best way to measure a force? using a force meter
Forces can be Forces can be both pushes and pulls.
What is the unit of force called? The unit of force is the newton, N.
Why does an astronaut weigh less on the Moon than on the Earth? An astronaut weighs less on the Moon than on the Earth because the force of gravity is weaker on the surface of the Moon than on the surface of the Earth.
What is the weight of a 20 kg box on the Earth? A 20kg box on Earth weighs 200N.
What is the pressure exerted by a man standing on one leg? The pressure exerted by a man standing on one leg is twice the pressure he exerts when standing on two legs.
The weight of a 100 N laser printer is spread over 0.5m2. What is the pressure it exerts? The pressure exerted by a 100 N laser printer spread over 0.5m2 is 200 N/m2.
What can we say about the forces on an object that is not moving? the forces must be balanced
What happens to the air resistance on a car as the car goes faster? As a car goes faster, air resistance increases.
A force of 4 N acts on a lever 2 m from the pivot. What is the moment? The moment is 8 Nm. Remember: moment = force x distance from pivot.
One way to increase the turning force on a spanner is to use a longer spanner
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