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Physics > Forces > Flashcards

Forces Flashcards

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1
Q

What is the resultant force?

A

The resultant force is the sum of all of the forces acting on an object.

The change in an object’s motion is caused by the resultant force.

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2
Q

What does it mean when a resultant force is acting on the object?

A

If the forces acting on an object are unbalanced (not equal), it means that a resultant force is acting on the object.

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3
Q

Resultant force equation

A

Resultant force (F) = mass (m) x acceleration (a)
F=ma

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4
Q

What will happen to a moving object if there is no resultant force?

A

It will continue to move at a constant velocity

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5
Q

What is newtons law?

A

Newton’s 1st Law says that the velocity of an object will only change if a resultant force is acting on the object. This applies to a stationary (still) or moving object.

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6
Q

True or false

If an object is stationary (not moving) and there is no resultant force acting on it, it will stay stationary.

A

True

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7
Q

True or false

A

If an object is moving and there is no resultant force acting on it, the object will continue moving in the same direction at the same speed.

This means the object will continue moving at the same velocity

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8
Q

What is the resultant force on a stationary object?

A

None

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9
Q

What is the definition of the resultant force?

A

The resultant force is the sum of all the forces acting on an object

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10
Q

What is newtons 3rd law?

A

Newton’s Third Law says that: whenever 2 objects interact, the forces that they exert on (apply to) each other are equal and opposite.

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11
Q

Which of Newton’s laws states that when objects interact, the forces they exert on (apply to) each other are equal and opposite?

A

Third law

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12
Q

What are free body force diagrams?

A

A free body force diagram is a diagram showing the forces acting on an object. These are shown as vectors.

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13
Q

What are the forces acting on a skydiver?

A

The forces acting on a skydiver are air resistance (acting upwards) and the skydiver’s weight (acting downwards).

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14
Q

What are the forces acting on a driving car?

A

The forces acting on a driving car are the driving force, the normal contact force, the weight and friction.

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15
Q

Why do we use free body diagrams?

A

We can use free body diagrams to work out the resultant force when more than one force is acting on an object. We can also use the diagrams to see if an object is in equilibrium. If the resultant force is zero, we say the object is in equilibrium.

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16
Q

True or false
We can use free body diagrams to work out the resultant force when more than one force is acting on an object. We can also use the diagrams to see if an object is in equilibrium. If the resultant force is zero, we say the object is in equilibrium.

A

True

17
Q

Can you use a vector diagram to work out the resultant force when 2 other forces of given?

A

Yes

18
Q

What forces act on a cliff diver?

A

Air resistance, divers weight

19
Q

Can you bend, stretch and compress objects by applying forces to them?

A

Yes - for this to happen there must be 2 or more forces acting on the object

20
Q

At least how many forces must be acting on an object to stretch, bend or compress it?

A

2

21
Q

What is the 2 ways objects can be deformed?

A

Elastically and inelastically

22
Q

An elastically deformed object will return to its original shape when the force stops.

A

True

23
Q

Inelastic deformation

A

An inelastically deformed object will not return to its original shape when the force stops.

24
Q

At least how many forces must be acting on an object to stretch, bend or compress it?

A

2

25
Q

In the context of springs, what is extension?

A

The change in length of a spring when a force is applied

26
Q

Force equation

A

Force = spring constant x extension

27
Q

How do you investigate hooked law?

A

First, measure the original length of the spring.
Next, hang different masses on the spring and measure the length of the spring in each case.
Adding masses to the spring increases the downwards force as each mass has weight.
The extension of the spring equals the length with masses minus the original length:
extension of the spring = length of the spring with masses − original length of the spring.
Plot a graph with the extension of the spring on the x-axis and force on the y-axis.

28
Q

Which law relates the force and extension of a stretched spring?

A

Hooked law

29
Q

Equation for Spring Extension

A

Extension = length of loaded spring - natural length of spring

Physics (4 decks)

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