Physics - 6.1 Distance, Speed, and Acceleration (copy)

What do scalar quantities have?

Magnitude (size) only.

What do vector quantities have?

Magnitude and direction.

Force is a _____ quantity?

Vector

How do you calculate the resultant force

Know the direction of the forces.

• If its both left and right then takeaway

• If the direction is the same add them together

What do scalar quantities not have?

A direction.

1. What type of quantity is speed?

2. What type of quantity is distance?

3. What type of quantity is displacement?

4. What type of quantity is velocity?

1. Speed = scalar

2. Distance = scalar

3. Displacement = vector

4. Velocity = vector

What’s the equation for speed?

Speed = Distance/Time

What is the equation for velocity

Velocity = Displacement/Time

What is displacement?

It is the distance moved in a straight line in a given direction from the starting point.

What is acceleration defined as?

change in velocity ÷ time

If the velocity of an object is decreasing, what will the acceleration be?

Negative.

What is acceleration measured in?

m/s²

What can a distance-time graph be used to explain?

The motion of an object and to calculate the speed of the object.

What is stationary on a distance time graph?

A straight line.

What is a constant speed on a distance time graph?

A diagonal straight line with constant gradient

What is the gradient on a distance-time graph equal to?

The speed of the object.

How do you show a greater speed on a distance-time graph?

A steeper line/gradient.

How do you show acceleration on a distance-time graph?

A curved upward line.

How do you find the mean speed on a distance-time graph?

Distance divided travelled by the time taken.

How do you find a speed at a given time on a distance-time graph?

The gradient of the line

How do you show deceleration on a distance-time graph?

A curved line that is decreasing with time.

What can speed-time graphs be used to describe?

The motion of an object.

On a speed-time graph what does

1. A horistonal line

2. A sloping upwards line

3. A downward sloping line

   represent?

1. Constant speed

2. Speed is increasing

3. Speed is decreasing

What can velocity-time graphs be used to describe?

Motion.

How can the acceleration be calculated in a velocity-time graph?

By calculating the gradient of the line.​

What happens with the gradient of a line as time goes on?

Increases with time, and so the acceleration is increasing.

How do you find the acceleration at a given time in a velocity-time graph?

By drawing a tangent. The gradient of the tangent is equal to the acceleration at that point.

How do you find the distance travelled on a velocity-time graph?

By calculating the area underneath the graph.