Physics GCSE Force (test 1)

Question 1

What type of quantity is force?

Answer 1

• Force is a vector quantity

Question 2

What do vector quality’s have?

Answer 2

• magnitude
• direction

Question 3

What are vectors physical quantities?

Answer 3

• force, velocity, displacement

Question 4

What are scalers?

Answer 4

• only have magnitude but no direction

Question 5

What are scalers physical quantities?

Answer 5

• speed, distance, mass, temperature

Question 6

How are vectors represented?

Answer 6

• by an arrow
• the length of the arrow shows its magnitude and the direction of the arrow shows the direction of the quantity?

Question 7

What is velocity?

Answer 7

• velocity is a vector

Question 8

What is speed?

Answer 8

• speed is a scaler (length of each arrow is the same)

Question 9

What is force?

Answer 9

• push or pull on an object that is caused by interacting with something

Question 10

What is a contact force?

Answer 10

• When the two objects are touching for the force to act

Question 11

What is a non- contact force?

Answer 11

• Objects do not need to be touching for the force to act

Question 12

What is an interactional pair?

Answer 12

• pair of forces that are equal and opposite and act on two interacting objects (Newtons Third law)

Question 13

What are the sun and earth attracted to each other by?

Answer 13

gravitational force (non contact force)
it is an equal but opposite attraction

Question 14

When is an object in equilibrium?

Answer 14

• When all of the forces on an object combine to give a resultant force of zero

Question 15

What does three forces on a scale diagram form?

Answer 15

• a triangle

Question 16

What is the turning effect of a force?

Answer 16

• a moment

Question 17

What is the equation for the moment of a force?

Answer 17

moment of a force= Force X Distance

Question 18

What is the distance in a moment?

Answer 18

• Perpendicular distance from the pivot to the line of action of force

Question 19

What does the force of a spanner cause?

Answer 19

• a turning effect of a moment on the nut (which acts as a pivot)

Question 20

How does the force or distance affect the moment?

Answer 20

• the larger force or longer distance would mean a larger moment.

Question 21

How do you get the maximum moment?

Answer 21

• push at right angles (perpendicular) to the spanner

Question 22

How does pushing at other angles affect the distance and moment?

Answer 22

• smaller distance - so a smaller moment

Question 23

When is an object balanced?

Answer 23

• if the total anticlockwise moment equals the total clockwise moment about a pivot

Question 24

What does levers increase?

Answer 24

• the distance from the pivot at which the force is applied

Question 25

Why do levers make it easier to do work?

Answer 25

M=F X D - less force is needed to get the same moment

Question 26

What are Gears?

Answer 26

- Circular disks with teeth around the edge

Question 27

What do the gears teeth do?

Answer 27

- interlock so the turning one causes another one to turn in the opposite direction

Question 28

What are gears used for?

Answer 28

- to transmit the rotational effect of a force from one place to another

Question 29

What will a force transmitted to a larger gear cause?

Answer 29

- a bigger moment as the distance to the pivot is bigger

Question 30

Which turns slower the larger gear or the smaller gear?

Answer 30

larger gear turns slower

Question 31

What is weight?

Answer 31

- force acting on an object due to gravity (measured in newtons)

Question 32

Where can the force act from?

Answer 32

- single point on the object (called its centre of mass)

Question 33

What is the centre of mass?

Answer 33

- the point where you can assume the whole mass is concentrated

Question 34

What is Newtons Third Law of motion?

Answer 34

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

Question 35

What is resultant force?

Answer 35

- single force that has the same effect as all the forces acting on the object

Question 36

How can you find the centre of mass of a 2D object?

Answer 36

- put a whole in one corner of the card and suspend the card from a rod - use a plumb line to draw a vertical line on the card from the rod - repeat procedure, hanging the card from a different corner -the point where the two lines meet is the centre of mass