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2014-01-29T21:25:46Z

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{{Not selected tab|[[2. Introduction to force and gravity|Theory]]}}
{{Selected tab|[[2. Exercises|Exercises]]}}
{{Not selected tab|[[2. Video|Video]]}}
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===Exercise 2.1===
<div class="ovning">
A man, of mass 75 kg, stands on a horizontal surface. Assume that the man has two points of contact with the ground.

a) Draw a diagram to show the forces acting on the man.

b) Calculate the magnitude of each of these forces.

</div>{{#NAVCONTENT:Answer|Answer 2.1|Solution a|Solution 2.1a|Solution b|Solution 2.1b}}

===Exercise 2.2===
<div class="ovning">
An aeroplane circles an airport at a constant speed. Are the forces acting on the aeroplane in equilibrium? Explain your answer.

</div>{{#NAVCONTENT:Answer|Answer 2.2|Solution|Solution 2.2}}

===Exercise 2.3===
<div class="ovning">
A helicopter, of mass 800 kg, is rising at a constant rate.

a) Are the forces acting on the helicopter in equilibrium?

b) Calculate the magnitude of the vertical lift force on the helicopter.

</div>{{#NAVCONTENT:Answer|Answer 2.3|Solution a|Solution 2.3a|Solution b|Solution 2.3b}}

===Exercise 2.4===
<div class="ovning">
Calculate the magnitude of the force that gravity exerts on each of the following objects.

a) A car of mass 1250 kg.

b) A table tennis ball of mass 4 grams.

c) A lorry of mass 4.2 tonnes.

</div>{{#NAVCONTENT:Answer|Answer 2.4|Solution a|Solution 2.4a|Solution b|Solution 2.4b|Solution c|Solution 2.4c}}

===Exercise 2.5===
<div class="ovning">

The weight of a body is 441 N. Calculate the mass of the body.

</div>{{#NAVCONTENT:Answer|Answer 2.5|Solution|Solution 2.5}}

===Exercise 2.6===
<div class="ovning">
A satellite, of mass 300 kg, orbits the earth at a height of 7000 km above the surface of the earth. Calculate the magnitude of the gravitational attraction that acts on the satellite.

</div>{{#NAVCONTENT:Answer|Answer 2.6|Solution|Solution 2.6}}

===Exercise 2.7===
<div class="ovning">
The mass of the moon is <math>\text{7}\textrm{.}\text{38}\times \text{1}{{0}^{22}}</math> kg and the radius of the moon is <math>\text{1}\textrm{.}\text{73}\times \text{1}{{0}^{6}}</math> m. Determine the acceleration due to gravity on the moon, by considering the force that the moon exerts on a particle of mass 1 kg on its surface.

</div>{{#NAVCONTENT:Answer|Answer 2.7|Solution|Solution 2.7}}

===Exercise 2.8===
<div class="ovning">

A planet has a mass of
<math>\text{5}\times \text{1}{{0}^{20}}</math>
kg and on this planet the acceleration due to gravity is 3.2 ms-1. Determine the radius of the planet.

</div>{{#NAVCONTENT:Answer|Answer 2.8|Solution|Solution 2.8}}

===Exercise 2.9===
<div class="ovning">
A man, of mass 80 kg, climbs 5000 m to the top of a mountain.

a) Use the Universal Law of Gravitation to calculate the gravitational attraction on the man.

b) Compare your answer to part (a) with the result given by using ''mg''.

</div>{{#NAVCONTENT:Answer|Answer 2.9|Solution a|Solution 2.9a|Solution b|Solution 2.9b}}

===Exercise 2.10===
<div class="ovning">
The mass of Mars is <math>\text{6}\textrm{.}\text{42}\times \text{1}{{0}^{23}}</math> kg and the radius of the planet is 3400 km.
What is the acceleration due to gravity on Mars?

</div>{{#NAVCONTENT:Answer|Answer 2.10|Solution|Solution 2.10}}

2. Exercises - Versionshistorik

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