science

Question 1

what are unit for force?

Answer 1

Newton (N)

Question 2

identify 3 ways force can change an object?

Answer 2

change its speed,direction or shape

Question 3

name 3 contact forces

Answer 3

friction ,push, pull, up thrust, air resistance, water resistance

Question 4

name 3 non contact forces

Answer 4

magnetism, weight, electrostatic

Question 5

name 2 forces on a skydiver

Answer 5

weight and air resistance

Question 6

which force pushes an object down to earth?

Answer 6

weight

Question 7

a control variable is a factor in an experiment that we must …….

Answer 7

keep the same

Question 8

an independent variable in the factor in the experiment that we ………….. so we can make a comparison

Answer 8

change

Question 9

the dependant variable in an investigation is the factor we ………… to answer the question

Answer 9

measure

Question 10

how many mm are in 1cm?

Answer 10

10mm

Question 11

if forces are balanced they are e……… in size and act in o………….. directions.

Answer 11

equal opposite

Question 12

if a pair of forces are unbalanced they are not equal in …………..

Answer 12

size

Question 13

what is a resultant force?

Answer 13

the overall force acting on an object.

Question 14

how do we calculate the resultant force?

Answer 14

by subtracting the size of the smaller force from the size of the bigger force.

Question 15

if a pair of forces are equal and opposite what is the resultant force?

Answer 15

0 N

Question 16

if force acting on an object are balanced what 2 things could the object be doing?

Answer 16

stationary or steady speed

Question 17

if the forces acting on an object are unbalanced in which 3 ways might the object be changing?

Answer 17

changing speed, direction or shape

Question 18

if the forces acting on an object are balanced, what is the resultant force?

Answer 18

0 N

Question 19

what force causes a moving object to slow down and stop moving?

Answer 19

friction