P5

Question 1

What is the difference between scalar and vector quantities

Answer 1

scalar - magnitude
vector - magnitude + direction

Question 2

Difference between contact and non contact

Answer 2

contact - objects are physically touching
non-contact forces - objects are physically separated

Question 3

Is force scalar or vector

Answer 3

vector

Question 4

Gives examples of contact and non contact forces

Answer 4

contact - friction, air resistance
non-contact - magnetic force, gravitational force, electrostatic force

Question 5

Give two examples of scalar and vector quantities

Answer 5

scalar - speed, distance, mass, temperature, time
vector - force, velocity ,displacement, acceleration, momentum

Question 6

What is an interaction pair

Answer 6

pair of forces that are equal and opposite and act on two interacting objects

Question 7

What two things are directly proportional

Answer 7

weight and mass

Question 8

What are the units for work done

Answer 8

Watts

Question 9

1 newton-meter = how many joules

Answer 9

1 joule

Question 10

What does work done against friction cause

Answer 10

a rise in the temperature of the object.

Question 11

What does elastically deformed mean

Answer 11

object being able to go back to its original shape and length after the force has been removed

Question 12

To stretch, compress or bend an object what is required

Answer 12

more than one force acting on the object

Question 13

How is weight measured

Answer 13

a calibrated spring-balance

Question 14

Define resultant force

Answer 14

Overall force acting on an object

Question 15

What is work done

Answer 15

When a force causes an object to move through a distance work is done on the object.

Question 16

What is elastically deformed
Objects that can be elastically deformed are called what

Answer 16

Object can go back to its original shape and length after the force has been removed
Elastic objects

Question 17

What is inelastically deformed

Answer 17

Object that doesn’t return to its original shape and length after the force has been removed

Question 18

What is the extension of an elastic object directly proportional to

Answer 18

force applied, provided that the limit of
proportionality is not exceeded.

Question 19

What is extension

Answer 19

Increase in length of a spring when its stretched

Question 20

What does the spring constant tell us

Answer 20

How many newtons it would take to stretch the object by one meter

Question 21

What is Hooke’s law

Answer 21

Force and extension are directly proportional

Question 22

When the spring graph starts to curve what does it represent

Answer 22

Limit of proportionality - object is inelastically deformed