Forces

Question 1

properties of scalar quantities

Answer 1

they only have magnitude
NO DIRECTION

Question 2

properties of vector quantities

Answer 2

have magnitude and an associated direction.

Question 3

what do arrows represent on vector quantities

Answer 3

The length of the arrow represents the magnitude, and the direction of the arrow shows the direction

Question 4

what is a force

Answer 4

a push or pull that acts on an object due to the interaction with another object
- have both magnitude and direction, meaning it’s a vector quantity

Question 5

what are contact forces

Answer 5

forces happening when objects are touching
eg tension or friction

Question 6

what are non contact forces

Answer 6

forces happening when the objects are separate

Question 7

examples of contact forces

Answer 7

• friction
• air resistance
• tension

Question 8

examples of non contact force

Answer 8

• electromagnetic
• magnetic
• gravitational

Question 9

when does an object experience tension

Answer 9

when it’s being stretched

Question 10

when does an object experience friction

Answer 10

when it’s sliding past another object

Question 11

when does an object experience air resistance

Answer 11

when its moving through air

Question 12

what is weight

Answer 12

the force acting on an object due to gravity

Question 13

what is Newton’s third law

Answer 13

when two objects interact with each other, they exert equal and opposite forces on each other

Question 14

The force of gravity close to the Earth is due to what?

Answer 14

due to the gravitational field around the Earth

Question 15

what does the weight of an object depend on

Answer 15

the gravitational field strength at the point where the object is

Question 16

equation for weight

Answer 16

mass x gravitational field strength

Question 17

what is weight measured in

Answer 17

newtons

Question 18

what is mass measured in

Answer 18

kg

Question 19

where does the weight of an object act

Answer 19

on the objects centre of mass, which is a single point

Question 20

what is the relationship between an objects mass and weight

Answer 20

they are directly proportional

Question 21

how is weight measured

Answer 21

using a newtonmeter

Question 22

when is work done

Answer 22

when energy is transferred from one store to another

Question 23

when is work done (forces)

Answer 23

when a force causes an object to move

Question 24

what happens when work is done against a frictional force

Answer 24

the objects temperature increases

Question 25

work done equation

Answer 25

W = force x distance

Question 26

1 joule is equal to…?

Answer 26

1 newtonmetre

Question 27

what is a resultant force

Answer 27

a single force that has the same effect as all the original forces acting together.

Question 28

what happens when a car brakes

Answer 28

• the brake presses against the wheel
• friction acts between the brake and the wheel
• the kinetic energy store of the car is transferred to the thermal energy store of the brakes
• the temperature of the brakes increases, and at the same time, the car slows down as it loses kinetic energy

Question 29

what is displacement

Answer 29

distance in a given direction

Question 30

what does the mass of an object tell us

Answer 30

how much matter the object has in it

Question 31

what is gravitational field strength

Answer 31

a measure of the force of gravity in a particular location

Question 32

what device can we use to determine an objects weight

Answer 32

a calibrated spring balance / newtonmeter

Question 33

when must the forwards and backwards forces be balanced

Answer 33

when the objects moving at constant velocity

Question 34

rule when finding work done

Answer 34

the distance must be in the line of action of the force