Y9 Revision

What is the equation that links speed, distance & time?

• distance = speed/time

• speed = distance/time

• time = distance x speed

• speed x distance = time

A blue car is travelling at 50km/h.

A red car overtakes the blue car at a speed of 70km/h.

What is the relative speed of the red car from a passenger in the blue car.

• 20km/h

• 50km/h

• 70km/h

• 120km/h

The image shows a distance time graph.

Select the answer that describes A, B, C & D correctly.

• A: Accelerating

  B: Constant Speed

  C: Accelerating

  D: Decelerating

• A: Constant Speed

  B: Stationary

  C: Constant Speed

  D: Return Journey

• A: Constant Speed

  B: Stationary

  C: Constant Speed

  D: Decelerating

• A: Accelerating

  B: Stationary

  C: Constant Speed

  D: Return Journey

Find the gradient of the graph in section A & section C.

In which section is the car travelling faster?

• A: 15

  C: 60

  C is travelling faster

• A: 60

  C: 15

  A is travelling faster

• A: 15

  C: 60

  A is travelling faster

• A:60

  C:15

  C is travelling faster

How could you calculate the speed of the car from any section in this graph?

• Find the Colour of the section.

• Find the area underneath the line for each section.

• Find the gradient of the line in the section.

• Combine all lines to make a pretty shape and work out the area inside it.

The image shows 3 identical triplets, all with the same mass and therefore weight.

The triple on the right of the seasaw has a weight of 500N and sits 2m away from the pivot in the centre.

How far away from the pivot point must the triplets on the left sit to balance the seasaw?

• 0.5m

• 4m

• 2m

• 1m

What is the formula for Moments about a pivot point?

• Moment = Force X Perpendicular Distance

• Moment = Force/ Perpendicular distance

• Moment = Force

• Moment = Perpendicular distance/ Force

A person is trying to undo a bolt. It is tight and difficult to turn.

What two options does the person have?

(select 2 answers)

• Increase Force

• Increase Perpendicular Distance

• Push the spanner instead of pulling.

• Decrease distance.

When forces or moments on an object are balanced, the object is said to be...

• balanced.

• Fortified.

• Pikachu'd

• in equilibrium.

The law of conservation of energy says that energy cannot be __________ or ___________.

• created /

  destroyed

• transferred / moved

• applied /

  concentrated

• transferred / deferred