P9 and P10 - Force and Motion

Question 1

What is the equation for speed?

Answer 1

speed = distance travelled / time taken

v (m/s) = d (m) / t (s)

Question 2

What is the gradient of a distance - time graph?

Answer 2

speed

Question 3

What is acceleration?

Answer 3

Change in velocity

Question 4

How do you calculate acceleration?

Answer 4

acceleration = change in velocity / time taken

acceleration = final velocity - starting velocity / time taken

a (m/s^2) = v (m/s) - u (m/s) / t (s)

Question 5

what is the unit for velocity?

Answer 5

metres per second, m/s

Question 6

what is the unit for acceleration?

Answer 6

metres per second squared, m/s^2

Question 7

what is a negative acceleration also called?

Answer 7

Deceleration

Question 8

What is the equation for force?

Answer 8

Force = mass x acceleration

F = m x a

F (Newtons) = m (kg) x a (m/s^2)

Question 9

What happens to a mass if a resultant force acts on it?

Answer 9

It will accelerate.

Question 10

What is mass?

Answer 10

The amount of matter an object has in kilograms, kg

Question 11

What is weight?

Answer 11

The force acting on a mass due to gravity.

Question 12

What is the equation for weight?

Answer 12

Weight = mass x gravitational field strength

W = m x g

W (N) = m (kg) x g (N/kg)

Question 13

If I went to another planet would my weight be different?

Answer 13

Yes, weight is a force due to the gravity of the planet acting on a mass.

Question 14

If I went to another planet would my mass be different?

Answer 14

No, mass is the amount of stuff that makes you up and would be the same.

Question 15

What is g, the gravitational field strength on Earth?

Answer 15

g= 9.81 m/s^2

Question 16

When stopping a car what affects the total stopping distance?

Answer 16

Thinking distance and braking distance

Stopping distance = thinking distance + braking distance

Question 17

What is thinking distance?

Answer 17

the distance travelled by the car in the time it takes the driver to react.

Question 18

What is braking distance?

Answer 18

The distance travelled by the car whilst the brakes are applying a stopping force.

Question 19

What factors affect thinking distance?

Answer 19

Distractions such as phones.
How alert the driver is being tired will slow reactions.
If the driver is under the influence of drugs or alcohol their reactions may be slower.

Question 20

What factors affect braking distance?

Answer 20

The condition and maintenance of the car.
The road conditions.
Wet or icy roads.

Question 21

What is Hooke’s law?

Answer 21

The extension of a spring is proportional to the force applied to it within its limit of proportionality.

Question 22

What is the equation for extension of a spring?

Answer 22

Force = spring constant x extension

F = k x e

F (Newtons) = k (N/m) x e (m)

Question 23

What can you use to measure the extension of a spring?

Answer 23

a ruler