Forces and Motion Revision

Describe what a scalar quantity is?

• A quantity which only has magnitude (size)
• A quantity which has magnitude and direction

Give three examples of scalar quantities?

• Distance, speed, Mass, energy
• Displacement, Velocity, acceleration, Force, weight, momentum
• Distance, speed, Mass, force

Describe what a vector quantity is?

• A quantity which has magnitude and direction
• A quantity which only has magnitude (size)

Give three examples of vector quantities?

• Displacement, Velocity, acceleration, Force, weight, momentum
• Distance, speed, Mass, energy
• Displacement, speed, acceleration, Force, weight, momentum

Why is velocity different to speed?

• Velocity has a direction
• Velocity has a magnitude

State the equation which links speed, distance and time, with units?

• Speed (m/s) = Distance (m) / Time (s)
• Speed (m/s) = distance x time

What does a flat line on a distance time graph represent?

• A stationary object
• An object accelerating

Describe how to determine the speed of an object from a distance time graph

• Gradient of the graph / Change in Distance (change in Y, Rise) divided by change in time (Change in x axis, run)
• Area under the graph

What does a steeper line represent on a distance- time graph?

• Faster Speed
• Slower Speed
• Stationary

State the equation which links acceleration, velocity and time with units

• Acceleration (m/s2) = Change in velocity (m/s) / Time (s)
• Acceleration (m/s2) = Distance (m) / Time (s)