forces

Question 1

what is a scalar quantity

Answer 1

a scalar quantity only has magnitude (size)

Question 2

what is a vector quantity

Answer 2

a vector quantity has both direction and magnitude

Question 3

what is the relationship between weight and mass

Answer 3

they are directly propotional

Question 4

what is the center of mass

Answer 4

the point where the weight of an object is concentrated

Question 5

what is elastic deformation

Answer 5

when an object has two or more forces applied to it in order to change its shape and then the object returns back to normal after the forces are removed

Question 6

formula for force with spring constant and extension

Answer 6

force (m) = spring constans (N/m) * extension (m)

Question 7

what is work

Answer 7

work is the transfer of energy by applying a force

Question 8

what is the formula for work

Answer 8

work (J) = force (N) * distance (m)

Question 9

what is a moment

Answer 9

the turning effect of a force

Question 10

what is the formula for calculating a moment

Answer 10

moment (Nm) = force (N) * distance from pivot (m)

Question 11

what is the functions of gears and levers

Answer 11

to act as a force multipliers

Question 12

what is the formula for pressure

Answer 12

pressure (pascals/pa) = force exerted at normal to a surface (N) * area of that surface (m²)

Question 13

why do objects float in liquids

Answer 13

objects float when the upthrust is equal to the objects weight or if the density of the

Question 14

how can you calculate upthrust

Answer 14

the size of the upthrust is equal to the weight of the water displaced by the object

Question 15

what is the formula for pressure of a column of liquid

Answer 15

pressure (pascals) = height of column * density of liquid (kg/m³) * gravitational feild strength

Question 16

what happens to the velocity of the car if it is moving in a circle at a constant speed

Answer 16

its direction will be constantly changing so the velociy will also be constantly changin as it is a vector quantity

Question 17

what does the gradient in a distance time graph show

Answer 17

the speed

Question 18

what is the equation of acceleration

Answer 18

change in velocity / time (s)

Question 19

what is newtons first law of motion

Answer 19

if the resultant forces acting on an object are 0 then the object will remain stationary or keep moving at a constant velocity

Question 20

what is newtons second law of motion

Answer 20

the acceleration of an object is directly proportional to the resultand force acting on the object and inversely proportional to the mass of the object

Question 21

what is the stopping distance

Answer 21

the distance travveled from when the driver spots an obstruction to when the driver stops

Question 22

what is the thinking distance

Answer 22

the distance travelled by the car during the drivers reaction time

Question 23

what is the braking distance

Answer 23

the distance travelled from when the driver applies the brakes to when it stops

Question 24

what is the formula for momentum

Answer 24

momentum (Kgm/s) = mass * velocity

Question 25

what is the formula for force regarding time and change in momentum

Answer 25

force (N) = change in momenum (Kgm/s) / time (s)