Forces and Acceleration Flashcards

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1
Q

What happens if the force on the object is unbalanced and the resultant force is on the same direction as the motion

A

It will accelerate

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2
Q

What happens if the force on the object is unbalanced and the resultant force is on the opposite direction as the motion

A

It will decelerate

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3
Q

What happens if the force on the object is unbalanced and the resultant force is zero

A

The object will remain at rest or at a constant velocity

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4
Q

What is the resultant force

A

All the forces added together, the single force that has the dame effect as all the forces together.

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5
Q

What is the equation that links the resultant force, mass and acceleration

A

Resultant force = Mass x acceleration

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6
Q

What is acceleration measured in

A

m/s²

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7
Q

What is the resultant force measured in

A

Newtons

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8
Q

What is measured in Kg

A

The mass

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9
Q

A car has 1,000kg. What force must the car’s engine supply to cause an acceleration of 2 m/s²

A

1000 x 2

= 2000N

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10
Q

Describe an experiment to investigate force and acceleration

A

Place a piece of card on a trolly
Get a light gate and set up to appropriate hight
Get another light gate and place 50cm apart
Place the trolly to piece of string, of which has 140g attached.
Release trolly and catch at end
Repeat using different masses

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11
Q

Mass is not a……

A

Force

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12
Q

Weight is a……

A

Force

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13
Q

What is weight caused by

A

The pull of gravity acting on a mass. Like other forces, weight is measured in newtons and has both a magnitude and direction

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14
Q

Give the equation that links weight, mass and gravitational field strength

A

weight = mass x gravitational field strength

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15
Q

What is the gravitational field strength on Earth

A

10 N/Kg

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16
Q

What is terminal velocity

A

The final speed of which an object can reach naturally

17
Q

How is terminal velocity reached

A

When falling, weight is larger than the upward air resistance, therefore the object accelerates.

As the object speeds up, the drag increases

Drag eventually equals the weight. The force is balanced! Terminal velocity has been reached

18
Q

In a vacuum, how come a bowling ball travels as fast a s a feather

A

No air resistance

19
Q

At terminal velocity, are there forces acting on the object

A

Yes, they are just balanced, so the object continues to fall at a constant rate