Physics topic 3 forces

Question 1

units to measure force

Answer 1

newtons (N)

Question 2

a force is a ___ or a ___

Answer 2

push or pull

Question 3

the forces that you exert can change the ____, ___ and ____

Answer 3

shape
speed
direction

Question 4

types of forces (12)

Answer 4

.friction
.reaction/normal force-ex. when youre sitting on a chair its exerting normal force on you which keeps you up
.air resistance
.water resistance-a form of drag that opposes the motion of an object through water
.engine force/thrust
.lift-this force lifts an airplane or bird
.tension
.compression
.upthrust-pushes an object up and makes it seem to lose weight in a fluid
.electrostatic force-an attractive or repulsive force between 2 charged objects
.magnetic force-an attractive or repulsive force between magnetic poles
.force of gravity/weight/gravitational attraction

Question 5

gravitational pull on earth

Answer 5

10 N
10N/Kg

Question 6

how to find the weight of something

Answer 6

W=mg
example
what is the weight if a body has a mass of 50kg?
50kgx10N=500N

Question 7

weight is a force caused by ________ and mass is the amount of ______ present in an object

Answer 7

gravity
matter

Question 8

the ___ of an object stays the same wherever it is but the ____ can change depending on the gravitational field strength

Answer 8

mass
weight

Question 9

what is a contact force and what is a non-contact force?

Answer 9

a contact force acts between 2 objects that are physically touching while a non-contact force acts at a distance, without any contact between bodies due to either attraction or repulsion

Question 10

name the non-contact forces (3)

Answer 10

gravitational force
magnetic force
electrostatic force
(the rest are contact forces)

Question 11

what is a balanced force

Answer 11

when 2 forces acting on an object are equal in size but act in opposite direction

Question 12

what is an unbalanced force

Answer 12

when 2 forces acting on an object are not equal in size

Question 13

if the forces on an object are unbalanced, the object can … or …

Answer 13

an object that is not moving starts moving

an object that is moving changes direction or speed

Question 14

what is a resultant force

Answer 14

the overall force that is acting on an object

Question 15

what is the difference between a scalar and vector quantity

Answer 15

a scalar is a quantity that only shows magnitude while a vector is a quantity that shows both magnitude and direction