unit 2 - forces and motion

Question 1

how to get average speed

Answer 1

distance moved/ time taken

Question 2

how to get average acceleration

Answer 2

change in velocity/ time taken

a= (v-u)/t

Question 3

what does it mean by a uniform acceleration

Answer 3

a constant acceleration

Question 4

what is v and u in the acceleration formula

Answer 4

u is the initial velocity

v is final velocity

Question 5

what is the value of gravity

Answer 5

10m/s^2

Question 6

what is a si unit for force

Answer 6

newton

Question 7

what is an upthrust

Answer 7

the upward force from a liquid

Question 8

what is a weight

Answer 8

the gravitational force

Question 9

what is a tension

Answer 9

force in a stretched material

Question 10

what is a thrust

Answer 10

the forward force (from the engine)

Question 11

formula for force

Answer 11

force= mass* acceleration

Question 12

what is a friction

Answer 12

the force that tries to stop materials sliding across each other

Question 13

formula for weight

Answer 13

w=mg

Question 14

formula for momentum

Answer 14

momentum = mass* velocity

Question 15

what is an impulse

Answer 15

change in momentum

Question 16

formula for impulse

Answer 16

FT = mv-mu

Question 17

what is the law of conservation of momentum

Answer 17

when two or more objects act on each other, their total momentum remains constant, providing no external forces acting

Question 18

what are vectors

Answer 18

the force that has a direction as well as the magnitude

Question 19

what are scalars

Answer 19

have magnitude but no direction

Question 20

what is the centripetal force

Answer 20

the inward force needed to make an object move in a circle

Question 21

how to increase centripetal force

Answer 21

increase
mass of the object
speed of the object

decrease
the radius of the circle

Question 22

describe the velocity and the speed in the centripetal force

Answer 22

speed is the same but velocity is constantly changing