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Physics > Motion And Forces (paper1) > Flashcards

Motion And Forces (paper1) Flashcards

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1
Q

Define distance

A

The route travelled in m

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2
Q

Define displacement

A

Shortest distance between 2 points

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3
Q

Define speed

A

The speed of an object is how quickly it travels over a certain distance

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4
Q

What’s the instantaneous speed

A

The speed at a particular point

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5
Q

Why do horizontal lines on a distance time graph mean?

A

That the object is stationary

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6
Q

Why do straight sloping lines mean

A

The object is travelling at a constant speed

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7
Q

The steeper the line the what?

A

The faster the object is travelling

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8
Q

How is the speed calculated on a distance time graph

A

From the gradient of the line

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9
Q

Equation for acceleration

A

Acceleration = change in velocity(m/s) over time taken(s)

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10
Q

How do you work out the change in velocity

A

Final velocity - initial velocity

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11
Q

What does a horizontal line mean on a velocity/time graph

A

The object is travelling at a constant velocity

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12
Q

What does a sloping line show on a velocity/time graph

A

That the object is accelerating. The steeper the line the faster acceleration

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13
Q

What does a line below the x axis show

A

An object travelling in the opposite direction

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14
Q

What is the definition for resultant forces

A

The difference between two forces going in opposite directions

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15
Q

What is Newton’s first law

A

A moving object will continue to move at the same speed and direction unless an external force acts on it.

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16
Q

What is circular motion

A

An object moving in a circle has a changing velocity even though the speed remains constant

17
Q

What is the resultant force that causes the change in direction

A

Centripetal force, which acts towards the centre of the circle

18
Q

How can centripetal force be caused

A

By tension in wires, friction or gravity

19
Q

Equation for weight

A

Weight(N)=mass(kg)x gravitational field strength (N/kg)

20
Q

What does Newton’s third law look at

A

The interactions between objects-when they touch or interactions such as gravity

21
Q

What are the pair of forces acting on an object called

A

Action-reaction forces

22
Q

What are action-reaction forces always?

A

They are always the same type of force

23
Q

What is the difference between action-reaction forces and balanced forces

A

Balanced forces act on the same object whereas action-reaction forces act on different objects

24
Q

What is momentum

A

Is the measure of the tendency of an object to keep moving - or how hard it is to stop the object moving.

25
Q

What is the momentum equation

A

Momentum = mass x acceleration

26
Q

What is the force equation

A

Force=mass x change in velocity

Time

27
Q

What is reaction time affected by

A

Weather conditions, tiredness and speed

28
Q

What does Newton’s second law look at

A

The factors affecting acceleration

29
Q

What does the acceleration in the direction of a resultant force depend on

A

The size of the force and the mass of the object

30
Q

What’s inertial mass

A

The force on an object divided by the acceleration that force produces

31
Q

What’s thinking distance

A

The distance it takes for a car to stop while the driver reacts to the situation

32
Q

What is braking distance

A

The distance it takes the brakes to stop the car

33
Q

How do you figure out the stopping distance

A

Stopping distance= braking distance + thinking distance

34
Q

What is reaction time

A

The time is takes for something to respond to a stimulus

35
Q

What do car brakes use to stop a car

A

Friction

36
Q

What does work done mean

A

The energy transferred by a force acting over a distance

37
Q

What is the work done equation

A

Work done= force x distance moved in the direction of the force

38
Q

What is the kinetic energy equation

A

Kinetic energy= 1/2 x mass x speed squared

Physics (11 decks)

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