Scalars and Vectors for OCR Physics A

1. Scalar or Vector?
• Mass
• Acceleration
• Displacement
• Volume
• Momentum
• Temperature
• Force
• Work
• velocity
Scalar Vector

2. Scalars and Vectors

4. Finding Resultant Forces

5. A force of 3 N and 4 N are
perpendicular to each other. What is
the resultant force?
Use 2 methods
1. Scale diagram
2. Pythagoras.
What is the angle
between the resultant
force and the 3N force?
What is the angle
between the 4 N force
and the Resultant
Force?

6. A Swimmer is travelling at a velocity of 2.0 ms-1 at right
angles to a river bank. The velocity of the river water is
3.5 ms-1. Calculate
a) the magnitude of the velocity of the swimmer.
b) the angle between the river bank and the direction
of the velocity of the swimmer.

7. Three forces each of 6 N, can be
applied together at any angles.
• Sketch the arrangement that gives the largest
resultant force and say how large it is.
• Sketch the arrangement that gives the
smallest resultant force and say how large it is.
• How could they be arranged to give a
resultant force of 6N?

8. A vector can be resolved into two
perpendicular components

9. Resolving Forces down a slope