Forces

Question 1

What are the three effects that indicate the presence of a force?

Answer 1

CHANGE SPEED
CHANGE DIRECTION
CHANGE SHAPE

Question 2

Can you categorise forces into push, pull and turning forces?

Answer 2

PUSHING= hockey stick on the ball
PULLING= tug of war
TURNING= using a spanner

Question 3

Can you state the three different non-contact forces?

Answer 3

GRAVITATIONAL
MAGNETIC
ELECTRIC

Question 4

What are non-contact forces also known as?

Answer 4

Force fields

Question 5

What are force fields?

Answer 5

A region in space within which you can detect a non-contact force.

Question 6

What is the unit of force?

Answer 6

newton (N)

Question 7

What is an objects weight?

Answer 7

The force due to gravity pulling it downwards to the centre of Earth.

Question 8

Which materials will be attracted to a magnet?

Answer 8

Any metal that has IRON in it and some NICKEL or COBALT

Question 9

Can you see a force?

Answer 9

NO, you can observe the effects of a force.

Question 10

Out of:
0-1N
0-25N
0-50N
What is the strongest spring?

Answer 10

0-50N, because it has to support the greatest force.

Question 11

Can you draw a diagram annotated about a newton balance

Answer 11

SEE FLASHCARD

Question 12

Explain the function of a newton balance.

Answer 12

-to measure forces
-push or pull forces

Question 13

What do unbalanced forces do?

Answer 13

Make things accelerate

Question 14

What do balanced forces?

Answer 14

-to stay at rest
-move with a constant speed in a straight line

Question 15

What is mass?

Answer 15

The amount of matter an object has. The mass of an object remains the same everywhere.

Question 16

What is mass measured in?

Answer 16

KILOGRAMS (KG)

Question 17

What is weight?

Answer 17

The force of gravity pulling down an object. Weight of an object depends on M and G.

Question 18

What is weight measured in?

Answer 18

NEWTONS (N)

Question 19

What is the calculation using the 5,2,10 formula?

Answer 19

W=MG
Weight = mass x gravitational field strength
e.g-
10 = 5x2
5 = 10/2

Question 20

What does a newton balance tell you about gravitational field strength?

Answer 20

It tells you the gravitational force on a 1kg mass.

Question 21

What is the unit for gravitational field strength?

Answer 21

Newtons Per Kilogram
(N/kg)

Question 22

What is the gravitational field strength near Earth?

Answer 22

10 newtons per kilogram
g = 10N/kg

Question 23

How much will a 1kg mass weigh in Newtons on Earth?

Answer 23

10N

Question 24

What will be the weight of a 5kg mass near the Earth’s Surface?

Answer 24

W=MG
W=?
M= 5 kg
G=10N/kg
= 5x10
=50N
W=50N

Question 25

Does gravitational force stay the same in different locations?

Answer 25

G has different values when in outer space or near a planet other than Earth.

Question 26

What is friction?

Answer 26

A force acting between two surfaces in contact and opposite to their relative movement.

Question 27

What is a NORMAL REACTION?

Answer 27

A force. Normal means at right angles

Question 28

Why do bumpy surfaces not slide over each other easily?

Answer 28

Lots of friction is created.

Question 29

What are ways of reducing frictional forces?

Answer 29

USE A LUBRICANT oil or water USE ROLLERS WHEELS AIR CUSHION

Question 30

What is the relationship between friction and direction of motion?

Answer 30

SEE FLASHCARD DIAGRAM Friction forces oppose the direction of motion.

Question 31

Explain how the brakes on a bicycle work.

Answer 31

Friction, they convert kinetic energy into heat.

Question 32

What are the names for up and down forces?

Answer 32

Weight = DOWN Normal Reaction Force = UP

Question 33

Comment on the sizes of the up and down forces.

Answer 33

They're equal in size and opposite in direction.

Question 34

What are the names for the backward forces when the car is travelling at a constant speed.

Answer 34

Engine force = LEFT Friction = RIGHT

Question 35

What is Newton's First Law?

Answer 35

That an object at rest or moving with a constant velocity will do so unless acted upon by an unbalanced force.