Free Body diagrams
multiple choice
force scenarios
which force is this?
random
100

Draw a free body diagram of an apple falling from a tree.

refer to the board for the answer.

100

What is a force?

  • A powerful energy pushing down.
  • A push or pull on an object.
  • Something that has a weight.
  • Something that can cause damage.
  • A push or pull on an object.
100

which person is heavier?

Person A

100

reaches from a cloud down to earth?

electric

100

what force lets you throw a spear?

applied

200

Identify the two forces

air resistance

Gravity

200

If forces acting on a ball are unbalanced, what happens?

  • The ball will move.
  • The ball will remain still.
  • The ball will roll to the left.
  • The ball will heat up.
  • The ball will move.
200

what can make a see-saw balanced?

both people weighing the same amount. moving along the see-saw to different point from the fulcrum.

200

has a north and south pole. non contact force

magnetic

200

what force means you dont sink into the earth when standing still?

normal force

300

Draw a free body diagram of a feather falling in a vacuum.

300

Non-contact forces include:

  • Gravity, wind resistance and electricity.
  • Magnetism, gravity and electricity.
  • Gravity, magnetism and mobile data.
  • Electricity, magnetism and energy.
  • Magnetism, gravity and electricity.
300

How can these two people balance the see-saw without touching the ground?

person A can move closer to the fulcrum.

300

what force is on a plane flying through the sky.

gravity, applied (thrust), air resistance

300

If the air gets thinner as you go higher (thinner air = less air particles), explain why planes fly high rather than closer to the ground.

to reduce resistance and save fuel.

400

Which way would this object move and why?

to the left, as the applied force is greater than the friction force.

400

A student is dragging a tyre in the sports centre for fitness. Mr O’Neill suggests they make it harder by going out to the concrete to try it. Why?

A) Concrete is rougher than the polished floor, so friction will be greater.

B) The concrete has spring force.

C) It is hot outside so gravity is stronger.

D) Concrete is rougher than the polished floor, so friction will be less.

A) Concrete is rougher than the polished floor, so friction will be greater.

400

If a feather and a bowling ball fall in a vacuum, what is the force that is missing that allows them to fall at the same time.

air resistance ( a vacuum has no air particles)

400

What forces slow down a ball thats been thrown into the air?

air resistance, gravity

400

A glider has no engine but can remain in the air flying for long periods. how does it do this?

uses air resistance and its clever wing design to keep in airborne.

500

Will this rocket get off the ground?

yes as the applied force is greater than gravity. seen in the longer arrow.

500

A book is sitting on the desk. A clumsy teacher walks past and knocks the book onto the floor.

What new force starts acting on the book once it is falling?

Gravity

Air resistance

Normal force

Magnetism

Air resistance

500

what is the net force on this object?

0 Newtons of force

100 - 100 = 0

500

slowing a bullet going from the air to the water.

water resistance
500

explain the direction of movement of a box pushed to the left with 100 N force, friction pushing right with 70N force, gravity 10 N and normal 10 N.

10 - 10 = 0 so it will not float or sink

100 - 70 = 30 to the left.

it will be pushed left.