# Forces And Motion (P1, P2, P3) Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Define displacement

A
• Vector quantity

* The direction and distance that an object moves in a straight line from start to finish.

2
Q

Define speed

A
• Scaler quantity

* Just how fast an object is moving (no direction).

3
Q

Define velocity

A
• Vector quantity

* How fast an object is moving in a certain direction.

4
Q

What is the speed equation?

A

Speed = Distance / Time

5
Q

What is the equation for acceleration?

A

Acceleration = (Final Velocity - Initial Velocity) / Time

OR

Acceleration = Change in Velocity / Time

6
Q

What is the first law of motion?

A

Balanced forces mean no change in velocity.

7
Q

What is the second law of motion?

A

A resultant force means acceleration or deceleration.

8
Q

What is the third law of motion?

A

If an object exerts force onto another object, then that object exerts and equal and opposite force back.

9
Q

What is the force equation?

A

Force = Mass x Acceleration

10
Q

Define distance

A
• Scalar quantity

* How far an object moves (no direction)

11
Q

What does gradient measure in DT and VT graphs?

A

Distance-Time -> Speed

Velocity-Time -> Acceleration

12
Q

What does the area under the graph represent in DT and VT graphs?

A

Distance-Time -> Nothing

Velocity-Time -> Distance

13
Q

What is the difference between vector and scalar quantities?

A

Vector -> Have magnitude and direction

Scalar -> Have only magnitude

14
Q

Give some examples of scalar quantities.

A

Time, Speed, Distance, Mass

15
Q

Give some examples of vector quantities.

A

Acceleration, Force, Momentum, Weight, GFS

16
Q

What is a resultant force?

A

A single force that has the same effects as all the forces acting on an object.

17
Q

What happens when the resultant force is zero?

A

The object remains stationary or travels at a constant velocity.

18
Q

What happens when the resultant force is not zero?

A

The velocity of the object changes.

19
Q

How does the parallelogram method work?

A
1. Pick a scale for the forces (e.g. 1N = 2cm)
2. Draw the two forces at the appropriate angle to each other at the correct length according to the scale (e.g. 20N = 10cm)
3. Complete the parallelogram with the other two lines
4. Measure the centre line
5. Convert this to a force using the scale (e.g. 25cm = 12.5N)
20
Q

What two factors increase the FORCE required to stop a car (braking force)?

A
• Speed of the car

* Mass of the car

21
Q

What is the stopping difference, thinking distance and braking distance?

A
• Stopping distance -> Total distance required for a car to safely stop -> Stopping distance = Thinking distance + Braking distance
• Thinking distance -> Distance travelled by the car while the driver is reacting
• Braking distance -> Distance travelled by the car while the braking force acts
22
Q

What factors affect thinking distance?

A
• Drugs, Tiredness, Alcohol
• Speed
• Distractions
23
Q

What factors affect braking distance?

A
• Speed
• Car conditions / brakes