End Of Unit Questions Flashcards Preview

GCSE Physics 3.2 Using Physics to Make Things Work > End Of Unit Questions > Flashcards

Flashcards in End Of Unit Questions Deck (11)
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1
Q

Why is it easier to move a big rock with a crow bar than your hands?

A

A crowbar allows you to apply the same force at a greater distance from the pivot so the moment is greater

2
Q

Why must an object moving in a circle be accelerating?

A

Because it is changing velocities as it changes directions constantly so it must be accelerating

3
Q

A force of 15N is applied at right angles to a spanner of 0.5 m long. What is the moment of this force?

A

7.5Nm

4
Q

An object that is freely suspended is displaced slightly then let go. Where will it’s centre of mass be when it comes to rest?

A

Directly below the point of suspension

5
Q

What is the pressure exerted on the ground by a block of weight 20N if the area in contact with the ground is 0.008m2?

A

2500Pa

6
Q

What is a centripetal acceleration?

A

An acceleration towards the centre of a circle

7
Q

Why will an oscillating simple pendulum eventually come to rest?

A

It transfers energy doing work against friction at the pivot and air resistance

8
Q

What is the frequency of a pendulum with a time period of 0.02s?

A

50Hz

9
Q

What is the amplitude of oscillation of a simple pendulum?

A

The distance from the highest point on one side to the highest point on the other side

10
Q

When will an object topple?

A

When the line of action of its weight is outside its base

11
Q

What is the moment of a force?

A

The turning effect of a force