FORCES GCSE PHYSICS 2

Question 1

What type of vector is force?

Answer 1

vector quantity

Question 2

What are some examples of vector quantities?

Answer 2

force, velocity, displacement, acceleration, momentum

Question 3

What are vector quantities?

Answer 3

have magnitude and direction

Question 4

What are scaler quantities?

Answer 4

only have magnitude and no direction

Question 5

What are some examples of scaler quantities?

Answer 5

speed, distance, mass, temperature, time

Question 6

How are vectors represented?

Answer 6

by an arrow
the length of the arrow shows the magnitude and direction of the arrow shows the direction of the quantity

Question 7

What is force?

Answer 7

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

Question 8

What are the two types of forces?

Answer 8

contact and non contact forces

Question 9

What is a contact force?

Answer 9

when two objects have to be touching for a force to act

Question 10

What is a non contact force?

Answer 10

if the objects do not need to touching for the force to act

Question 11

What is an interactional pair?

Answer 11

is a pair of forces that are equal and opposite and act on two interacting objects (basically newtons third law)

Question 12

What is the sun and the earth attracted to eachother by?

Answer 12

• by gravitational force
• this is a non contact force
• an equal but opposite force of attraction is felt by both the sun and the earth

Question 13

What is mass?

Answer 13

-the amount of “stuff” in an object
- for any given object this will have the same value anywhere in the universe

Question 14

What is weight?

Answer 14

• the force acting on an object due to gravity (the pull of gravitational force on the object)

Question 15

When is gravitational field strength the easiest?

Answer 15

• its stronger the closer to are to the mass causing the field
• and stronger for larger masses

Question 16

What does the weight of an object depend on?

Answer 16

• depends on the strength of the gravitational field at the location of the object
• the weight of an object changes with its location

Question 17

How is weight measured?

Answer 17

• forced measured in newtons

Question 18

What is the equation for weight?

Answer 18

weight= mass x gravitational force

Question 19

What is a single force?

Answer 19

• resultant force

Question 20

When does a force need to be applied?

Answer 20

• to make something move

Question 21

What happens when you push something along a rough surface?

Answer 21

• you are doing work against frictional forces
• energy is being transferred to the kinetic energy store of the object because it starts moving
• some is transferred to thermal energy stores due to friction
• this causes the temp of the object to increase

Question 22

How can you find out how much work is done?

Answer 22

work done= force x distance

Question 23

What happens if all of the forces acting on an object?

Answer 23

• they give a resultant force of zero
  -the object is in equilibrium

Question 24

How do forces act?

Answer 24

• horizontally, vertically, awkward angles

Question 25

How do you calculate elastic potential energy?

Answer 25

0.5 x spring constant x extension squared