Motion GCSE Edexcel combined science physics higher

Vectors and scalars, distance-time graph, Velovity-time graph and acceleration.

Define scalar.

Has a magnitude and a units.

Define vector.

Has a magnitude, units and a direction.

Define displacement.

Distance in a straight line.

Which quantity is a vector quantity; distance or displacement?

Displacement.

When people say,’As the crow flies’ are they referring to distance or displacement?

Distance.

True or false: For a single object in motion, displacement can be equal to distance but it can never be bigger.

True.

What are other scalar quantities?

Distance, speed, energy and time.

What are other vector quantities?

Displacement, velocity, acceleration and momentum.

What is the differences between distance and displacement?

Distance-How far you are going. Displacement-Distance in a straight line.

What is a typical speed for walking?

1.5m/s.

What is a typical speed for running?

3m/s.

What is a typical speed for cycling?

6m/s.

What is a typical speed for a car?

15m/s.

What is a typical speed for a train?

90m/s.

What is a typical speed for a plane?

250m/s.

What is the typical speed for sound in air?

330m/s.

What is a typical speed for light in air?

300,0000,000m/s.

How do you calculate speed?

Speed=distance/time.

What is the unit for calculating speed?

Metres per second=metres/second

What is the symbol for calculating speed?

S=d/t.

How do you calculate velocity?

Velocity=displacement/time

What is the unit to calculate velocity?

Metres per second=metre/second.

What is the symbol to calculate velocity?

V=s/t.

On a distance time-graph what sort of line shows acceleration?

Curved line.

What happens to speed in positive acceleration?

The speed increases as the gradient is getting steeper (higher).

What happens to the speed in negative acceleration?

Slows down and the gradient is decreasing.

What is negative acceleration known as?

Deceleration.

How can we find momentary speed of an accelerating object from a distance-time graph?

By drawing a tangent.

Define acceleration?

The rate of change of velocity (speed or direction).

What is the unit for acceleration?

Metres per second squared.

Explain why pressing the accelerator in a car causes the car to accelerate:what change is made to the velocity?

It speeds up the car.

Explain why applying the brakes in a moving car causes it to accelerate:what change is made to the velocity?

Decreases the speed of the car.

Explain why the motion of a pebble dropped from a resting point is acceleration:what change is made to the velocity?

Increases speed.

Explain why a pebble landing on the ground undergoes acceleration:what change is made to the velocity?

Decreases speed.

Explain why a bouncing ball is accelerating:what change is made to the velocity?

Changes speed from positive to negative.

Explain why a car turning a corner is accelerating:what change is made to the velocity?

It is changing direction.

Explain why the Moon orbiting the Earth is accelerating.

It is changing direction.

What is the relationship between force and acceleration?

It is directly proportional.

Define turning a corner?

Changing direction.

Define circular motion.

Changing direction.