P5 Forces

Question 1

<p>What is a <b>Scalar Quantity</b>?</p>

Answer 1

<p>A Scalar Quantity is a physical quantity that has only magnitude</p>

Question 2

<p>What are some examples of Scalar Quantities?</p>

Answer 2

<ul><li>Temperature</li><li>Mass</li><li>Energy</li><li>Distance</li><li>Speed</li><li>Density</li></ul>

Question 3

<p>What is a <b>Vector Quantity</b>?</p>

Answer 3

<p>A Vector Quantity is a physical quantity that has both size and direction</p>

Question 4

<p>What are some examples of Vector Quantities?</p>

Answer 4

<ul><li>Force</li><li>Displacement</li><li>Velocity</li><li>Acceleration</li><li>Momentum</li></ul>

Question 5

<p>How do you add Vectors together?</p>

Answer 5

<p>Draw a tip-to-tail diagram</p>

Question 6

<p>How do calculate <b>acceleration</b>?</p>

Answer 6

<p>Acceleration = change in velocity ÷ time taken</p>

Question 7

<p>What are <b>Contact Forces</b>?</p>

Answer 7

<p>Contact Forces are forces that happen when two objects are touching</p>

Question 8

<p>What are some examples of Contact Forces?</p>

Answer 8

<ul><li>Friction</li><li>Air Resistance</li><li>Tension</li></ul>

Question 9

<p>What are <b>Non-Contact Forces</b>?</p>

Answer 9

<p>Non-contact forces are forces that happen when the objects are separated</p>

Question 10

<p>What are some examples of Non-Contact Forces?</p>

Answer 10

<ul>Gravitational Force<li>Electrostatic Force</li><li>Magnetic Force</li></ul>

Question 11

<p>What are an <b>interaction pair</b>?</p>

Answer 11

<p>An interaction pair are a set of two forces that are equal and opposite</p>

Question 12

<p>How is constant speed shown on a distance-time graph?</p>

Answer 12

<p>Constant speed is shown by a straight line</p>

Question 13

<p>How can you tell if an object is stationary on a distance-time graph?</p>

Answer 13

<p>If the line is horizontal, the object is stationary</p>

Question 14

<p>How can you tell if an object's speed is constant on a <b>Velocity-time graph</b>?</p>

Answer 14

<p>If the line is horizontal, then the speed is constant</p>

Question 15

<p>How can you tell if an object is accelerating in a velocity-time graph?</p>

Answer 15

<p>If the gradient of the line is positive, the object is accelerating</p>

Question 16

<p>How can you tell if an object is accelerating in a velocity-time graph?</p>

Answer 16

<p>If the gradient of the line is negative, then the object is decelerating</p>

Question 17

<p>How do you work out the distance travelled on a velocity-time graph?</p>

Answer 17

<p>The area under the graph is equal to the distance travelled</p>

Question 18

<p>What is <b>inertia</b>?</p>

Answer 18

<p>Inertia is a measure of how difficult it is to change an object's motion</p>

Question 19

<p>How do you calculate Weight?</p>

Answer 19

<p>Weight = Mass × Gravitational Field Strength</p>

<p>W=Mg</p>

Question 20

<p>What is an object's <b>Centre of Mass</b>?</p>

Answer 20

<p>An object's centre of mass is a single point where all the mass of an object appears to be</p>

Question 21

<p>When will an object topple?</p>

Answer 21

<p>An object will topple when its centre of mass is located outside of its base</p>

Question 22

<p>What is <b>Weight</b>?</p>

Answer 22

<p>Weight is the force that acts on an object in gravitational field</p>

Question 23

<p>What is the <b>Resultant Force</b>?</p>

Answer 23

<p>Resultant Force is the sum of all of the forces acting upon an object</p>

Question 24

<p>What is Newton's 2^nd Law?</p>

Answer 24

<p>Resultant Force (N) = mass(kg) × Acceleration(m/s²)</p>

<p>F=ma</p>

Question 25

What is Newton's 1^st Law?

Answer 25

Newton's 1^st Law states that the velocity of an object will only change if a resultant force is acting on an object

Question 26

What would happen if no resultant force is acting upon an object?

Answer 26

If an object is moving, it will continu moving at the same velocity (same direction and speed)

If an object is stationary, it will remain stationary

Question 27

What is Newton's 3^rd Law?

Answer 27

Newton's 3^rd Law states that whenever two objects react, the forces they exert on each other are equal and opposite

Question 28

At least how many forces must be acting on an object to stretch, bend or compress it?

Answer 28

2

Question 29

What is Elastic Deformation?

Answer 29

Elastic deformation is when an object returns to its original shape when the force is removed

Question 30

Whatr is Inelastic Deformation?

Answer 30

Inelastic Deformation is when an object is unable to return to its original shape once the force is removed

Question 31

What is Hooke's Law?

Answer 31

Hooke's Law states the extension of a spring is directly proportional to the force applied

Question 32

What is the equation for Hooke's Law?

Answer 32

F = ke

|

Force(N) = Spring Constant() × Extension

Question 33

What is a spring's Limit of Proportionality?

Answer 33

The Limit of Proportionality is the point where Hooke's Law no longer true when stetching a material

Question 34

How do you calculate Elastic Potential Energy?

Answer 34

Elastic Potential Energy (Joules) = ½ × Spring Constant (Newtons/Metre) × Extension (Metres)²