1. How can forces be represented?

2. A force diagram uses labelled arrows to show all the forces
acting on the object.
How can forces be represented?
The forces acting on any object can be shown using a
force diagram.

3.  The direction of each arrow shows
the direction of each force.
A force diagram uses labelled arrows to show all the forces
acting on the object.
How can forces be represented?
The forces acting on any object can be shown using a
force diagram.
 The length of each arrow is
proportional to the size of the force.

4.  The direction of each arrow shows
the direction of each force.
A force diagram uses labelled arrows to show all the forces
acting on the object.
What is the force diagram for this
ball when it first starts to fall?
How can forces be represented?
The forces acting on any object can be shown using a
force diagram.
 The length of each arrow is
proportional to the size of the force.

5.  The direction of each arrow shows
the direction of each force.
A force diagram uses labelled arrows to show all the forces
acting on the object.
What is the force diagram for this
ball when it first starts to fall?
air
resistance
weight
How can forces be represented?
The forces acting on any object can be shown using a
force diagram.
 The length of each arrow is
proportional to the size of the force.

6.  The direction of each arrow shows
the direction of each force.
A force diagram uses labelled arrows to show all the forces
acting on the object.
What is the force diagram for this
ball when it first starts to fall?
air
resistance
weight
How can forces be represented?
The forces acting on any object can be shown using a
force diagram.
 The length of each arrow is
proportional to the size of the force.
Forces are measured in newtons (N)

7. What forces are acting on this fish as it swims at a constant
speed?
What forces act on a swimming fish?

8. thrust
What forces are acting on this fish as it swims at a constant
speed?
friction
weight
upthrust
What forces act on a swimming fish?

9. thrust
What forces are acting on this fish as it swims at a constant
speed?
friction
Thrust is the forwards force created by the fish.
Upthrust is the upwards force on the fish caused by the
water around the fish. This is sometimes called buoyancy.
weight
upthrust
What forces act on a swimming fish?

10. What forces are acting on this accelerating boat?
What forces act on a moving boat?

11. What forces are acting on this accelerating boat?
What forces act on a moving boat?
thrust
friction weight
upthrust
air
resistance

12. What forces are acting on this accelerating boat?
What forces act on a moving boat?
thrust
friction weight
upthrust
air
resistance
Air resistance is friction caused by movement through air.