Forces- the effect of a force

Question 1

what happens when an unbalanced force acts on a object

Answer 1

work is done (WD)

Question 2

equation for work is done (WD)

Answer 2

WD= Force x distance travelled ( in direction of the force )

Question 3

what 3 main things can an unbalanced force to do an object

Answer 3

1. change shape
2. change motion
3. cause rotation

Question 4

where does the weight of body (mass act )

Answer 4

through the centre of gravity ( the centre of mass )

Question 5

equation for weight

Answer 5

weight = mass x gravitational field strength

W=mg

Question 6

how many laws of motion does newton have

Answer 6

3

Question 7

what is Newton’s 1st law of motion + equation

Answer 7

An object moves at a constant velocity ( speed in a straight line), unless acted on by an unbalanced force

v= at + u

Question 8

what is the difference between an equal force and a balanced force

Answer 8

??? ( find out )

Question 9

how can an object be in equilibrium ( 2 things )

Answer 9

1. sum of forces is = to 0

2. sum of anticlockwise moments is equal to sum of clockwise moments

Question 10

equation for force

Answer 10

Force = mass x acceleration (change in velocity/ time )

F=ma

Question 11

what is Newtons 2nd law of motion + equation

Answer 11

The total force on object is given by its rate of change in momentum

v2=u2+2as

Question 12

what is Newtons 3rd law of motion

Answer 12

For every force on an object there is an equal force but in the opposite direction

All forces come in equal and opposite pairs

Question 13

what is object at terminal velocity

Answer 13

an object with balanced forces acting upon it

Question 14

what factors effect thinking distance

Answer 14

Drugs ( include alcohol )

Tiredness

Question 15

what factors effect braking distance

Answer 15

vehicle mass
vehicle speed
road surface
condition of brakes

Question 16

equation for stopping distance

Answer 16

stopping distance = thinking distance + braking distance

Question 17

S= ?
U=?
V=?
A=?
T=?

Answer 17

S= displacement (distance )
U= initial speed
V= final speed
A= acceleration
T= time