Topic 1- Forces

Question 1

What are balanced forces?

Answer 1

• When two forces acting on an object are equal in size but act in opposite directions
• If the forces on an object are balanced (or if there are no forces acting on it) this is what happens:
• an object that is not moving stays still
• an object that is moving continues to move at the same speed and in the same direction

Question 2

What are unbalanced forces?

Answer 2

*When two forces acting on an object are not equal in size and act in the same direction

• If the forces on an object are unbalanced this is what happens:
• an object that is not moving starts to move
• an object that is moving changes speed or direction

Question 3

Whats the difference between equal forces and balanced forces?

Answer 3

Balanced forces- same size, opposite directions

Equal forces- not specific

Question 4

What is the definition of the term equilibrium?

Answer 4

When all the forces that act upon an object are balanced, then the object is said to be in a state of equilibrium.

Question 5

Whats Hooke’s law?

Answer 5

Force is proportional to extension up to the elastic limit

F= -k ( sprint constant) x

Question 6

what can a force be used for?

Answer 6

to stretch, compress and bend objects

Question 7

what does g stand for

Answer 7

gravitational field strenth

Question 8

give the definition of mass

Answer 8

how much matter ‘ stuff’ you are made of ( measured in kg)

Question 9

give the definition of weight and the unit

Answer 9

a force caused by gravity acting on your mass ( measured in N)

Question 10

how do you calculate weight?

Answer 10

weight (N)= mass (kg)* gravitational filed strength ( N/kg)

g on Earth = 10 N/kg

Question 11

give the equation for Force

Answer 11

F=ma

Question 12

give the definition of upthrust

Answer 12

the upward force that a liquid or gas exerts on a body floating in it.

Question 13

what happens to the acceleration when the forces are balanced

Answer 13

a = 0