Forces

What is a Newton-meter used to measure?

• Moment
• Displacement
• Force
• Gravitational field strength

If an object is moving continuously at the same speed in the same direction,what can you say about the resultant force on it?

• The resultant force is in the direction of movement.
• The resultant force is zero.
• The resultant force acts in the opposite direction to the movement.
• The weight is the only force acting so it must be the resultant.

What is the resultant force here?

• + 68 N
• + 172 N
• 0 N
• -68 N

Which point is the centre of mass of this uniform hexagon of thin card?

• A
• B
• C
• D

Which of these is a vector?

• Time
• Speed
• Mass
• Acceleration

Which of these could represent the resolved components of a single force?

• 
• 
• 
• 

In an experiment to find the centre of mass of a card shape, why is it important that the card can swing freely?

• Friction may cause the card shape to catch on the plumbline.
• Friction may deform the card shape.
• Friction may stop the card shape settling with the centre of mass below the point of suspension.
• Friction would make it difficult to mark the card with a vertical line.

Which of the following statements are true? Pick as many as you like.

• The bigger the arrow, the bigger the force.
• You can think of a vector as an arrow.
• The resultant force on the marker is to the left.
• Team A pulls team B harder than team B pulls team A.
• The resultant force on the marker is zero.

Choose which statements are true about the centres of mass of these symmetrical objects.

• The centre of mass is in the middle of the object.
• The centre of mass is always directly below where you hang it from.
• The centre of mass is along an axis of symmetry.
• If the rectangle was made of metal not paper its centre of mass would be in a different place.
• You can only do an experiment to find the centre of mass if an object is symmetrical.

What does this graph show?

• A car moving at a fast constant speed
• An accelerating car
• A stationary car
• A car moving with a slow constant speed