Forces

Question 1

What is a force?

Answer 1

a push or pulling motion

Question 2

give an example of 2 contact forces?

Answer 2

friction, air resistance, tension, reaction

Question 3

give an example of 2 non contact forces?

Answer 3

weight, electrostatic, magnetic

Question 4

what is a scalar quantity

Answer 4

size only, no direction

Question 5

what is the force that pulls us down to the ground?

Answer 5

weight

Question 6

what is a vector quantity?

Answer 6

both size and direction

Question 7

give 4 examples of scalar quantities?

Answer 7

distance, speed, time, mass, temperature, volume, power, energy

Question 8

give 3 examples of vector quantities?

Answer 8

force, velocity, acceleration, momentum, magnetic field, displacement

Question 9

what is the key thing to remember when drawing force triangles?

Answer 9

tip to tail

Question 10

what is the speed of sound?

Answer 10

330m/s

Question 11

does sound move faster or slower through denser materials?

Answer 11

faster

Question 12

in a distance time graph, what does the horizontal line show?

Answer 12

stationary

Question 13

in a distance time graph, what does the steeper line indicate

Answer 13

faster constant speed

Question 14

what is the force that pulls us up of the ground?

Answer 14

reaction/ drag

Question 15

what is newtons first law of motion

Answer 15

a body will remain at rest or constant velocity if the forces are balanced. an unbalanced force will make an object accelerate in the direction of the force

Question 16

what is newtons second law of motion

Answer 16

the acceleration of a body is proportional to the resultant force if they are in the same direction. it is inversely proportional to the mass

Question 17

what is inertial mass?

Answer 17

a measure of how difficult it is to change the velocity of an object

Question 18

what is the card on the dynamic trolley called?

Answer 18

interrupt card

Question 19

what happens to the acceleration of the trolley as the mass increases

Answer 19

decreases

Question 20

what is newtons third law of motion?

Answer 20

when body A exerts a force in body B, body B exerts an equal and opposite force on Body A

Question 21

what is resultant force?

Answer 21

a single force that can replace all of the other forces acting on an object

Question 22

how do you find the centre of mass of an irregular shape?

Answer 22

suspend the object from 2 locations and drop a plumb line and wherever it intersects is the centre

Question 23

give 3 things that impact thinking distance?

Answer 23

drugs/alcohol, poor visibility, tiredness, distractions, greater speed

Question 24

give 3 things that impact braking distance?

Answer 24

greater speed, icy roads, wet roads, poor road conditions, worn tires or brakes

Question 25

how many forces are needed to change the shape of spring?

Answer 25

2

Question 26

what happens when force is applied to a spring?

Answer 26

it will change shape and extend

Question 27

what happens to the extension of spring as more force is added?

Answer 27

it extends further

Question 28

which law shows force is proportional to extension?

Answer 28

hooks law

Question 29

is the total momentum before a collision equal to that after?

Answer 29

yes

Question 30

is momentum a closed system?

Answer 30

yes

Question 31

what is deformation

Answer 31

a change in shape

Question 32

what is elastic deformation

Answer 32

where the shape can return to its original shape or size when the forces are removed

Question 33

what is inelastic deformation?

Answer 33

where the shape does not return to original shape or size