P2.1 - Forces and their effects Flashcards

1
Q

Whenever two objects interact, the forces they exert on each other are…

A

Equal and Opposite.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is a resultant force?

A

When a number of forces are acting on an object, they may be replaced by a single force, the resultant force.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What can an resultant force change about an object?

A

Its state of rest or motion.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What will happen when the resultant force acting on a stationary object is zero?

A

The object will remain stationary.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What will happen when the resultant force acting on a stationary object is NOT zero?

A

The object will accelerate in the direction of the resultant force.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What will happen when the resultant force acting on a moving object is zero?

A

The object will continue to move at the same speed and in the same direction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What will happen when the resultant force acting on a moving object is NOT zero?

A

The object will accelerate in the direction of the resultant force.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the acceleration of an object determined by?

A

The resultant force acting on the object and the mass of the object.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is velocity?

A

The speed of a object in a given direction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are most resistive forces caused by?

A

Air Resistance.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is stopping distance?

A

The sum of the distance the vehicle travels during the driver’s reaction time (thinking distance) and the distance it travels under the braking force (braking distance).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What can a drivers reaction time be affected by?

A

Tiredness, drugs and alcohol.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What happens when the brakes are applied?

A

Work done by the friction force between the brakes and the wheel reduces the kinetic energy of the vehicle and the temperature of the brakes increase.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What factors can affect braking distance?

A

Adverse road and weather conditions (including wet or icy conditions) and poor condition of the vehicle.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The faster an object moves through a liquid…

A

…the greater the frictional force that acts on it.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What happens to objects when they fall through fluids?

A

The object will initially accelerate due to the force of gravity. Eventually the resultant force will be zero and the object will move at its terminal velocity (steady speed)

17
Q

How can a force acting on an object change it?

A

The force can cause a change in shape.

18
Q

What happens when force is applied to an elastic object, such as a spring?

A

It will result in the object stretching and storing elastic potential energy.

19
Q

What is the relationship between the force applied to the elastic object and the extension of it?

A

The extension of an elastic object is directly proportional to the force applied, provided that the limit of proportionality is not exceeded.