Force on Systems

What is a force?

• it is anything which is capable of changing the state of

  motion or rest of a body, or deforming it.

• It is anything that occupies a space and has mass and volume.

• It is a device that is used to measure forces and to weigh bodies.

• is a change of position of a body over time with respect to a reference system which is considered fixed.

The unit of force is the Newton

• N

• n

• Nn

Elastic materials are

• those that deform when a force is applied.

• those that deform but return back to their original shape

• those that can be applied forces but go back to the beginning

• None is correct.

Plastic materials are

• those that deform with a form but do not return back to their original shape.

• those that deform with a form and return back to their original shape.

• None is correct.

• A non-eco-friendly material

It two forces are the same size, something will happen. The forces are unbalanced.

• True.

• False.

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Friction is the force between two touching things.

• True.

• False.

What is the force that causes objects to fall to Earth?

• Air resistance
• Gravity
• Water resistance
• Pressure

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Which of these is NOT a force?

• Friction
• Air resistance
• Water resistance
• Electrical resistance

In which direction does gravity act?

• Downwards
• Upwards
• In all directions
• Towards the centre of the Earth

What force does a parachute use to slow things down before hitting the ground?

• Friction
• Air resistance
• Water resistance
• Wind