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A-Level Physics > Movement and Forces > Flashcards

Movement and Forces Flashcards

1
Q

What is a scalar quantity?

A

A force with magnitude but no direction.

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2
Q

What is a vector quantity?

A

A force with magnitude and direction.

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3
Q

Give four examples of scalar quantities.

A

Speed, mass, distance, temperature.

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4
Q

Give four examples of vector quantities.

A

Velocity, weight, displacement, acceleration.

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5
Q

What does SUVAT stand for?

A

Displacement, Initial Velocity, Final Velocity, Acceleration and Time.

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6
Q

What is the gradient of a displacement-time graph?

A

Velocity.

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7
Q

What is the gradient of a velocity-time graph?

A

Acceleration.

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8
Q

What is the area underneath a velocity-time graph?

A

Displacement

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9
Q

If a line is flat in a displacement-time graph, what does it represent?

A

That the object is stationary.

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10
Q

If a line is flat in a velocity-time graph, what does it represent?

A

That the object is moving at a constant speed.

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11
Q

What is the average acceleration due to gravity?

A

g=9.81

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12
Q

What is the center of mass?

A

The point on an object that is acted on by weight.

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13
Q

Where will the center of mass be for a uniform body?

A

In the middle.

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14
Q

What is instantaneous velocity?

A

The velocity of an object at a specific point in time.

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15
Q

What is average velocity?

A

The velocity of an object over a specific time frame.

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16
Q

What is uniform acceleration?

A

Where the acceleration of an object is constant.

17
Q

What is the area underneath an acceleration time graph?

A

Velocity

18
Q

What is Newton’s 1st Law?

A

An object that is at rest or at a constant velocity, will not change until acted upon by a resultant force.

19
Q

What is Newton’s 2nd Law?

A

The acceleration of an object is proportional to the force experienced by the object. (AKA F=ma)

20
Q

What is Newton’s 3rd Law?

A

For each force experienced by an object, the object exerts an equal and opposite force.

21
Q

What are the 4 SUVAT equations?

A 
v = u + at
s = ½(u + v) x t
s = ut + ½at²
v² = u² + 2as
22
Q

How do we resolve a vector?

A

We split a resultant vector into the x-direction and y-direction.

23
Q

What’s a free body diagram?

A

A diagram which uses arrows to show forces on the body’s we are interested in.

24
Q

What’s the definition of weight?

A

Weight is the force acting upon an object due to gravity.

25
Q

How do we know if a pair of forces are obeying Newtons Third Law?

A

Same type of force.
Same magnitude.
Act on different bodies
Act in opposite directions.

26
Q

What are coplanar forces?

A

Where all the forces in a system are acting on the same plane.

27
Q

What is 1 newton?

A

1 newton is the force required to accelerate 1kg of mass 1ms⁻² in the direction of the force.

28
Q

What must be constant for us to use the equation F=ma?

A

mass

A-Level Physics (12 decks)

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