Physics 5: Forces

Question 1

What is the difference between a vector and a scalar quantity

Answer 1

Vector - magnitude + direction

Scalar - magnitude only

Question 2

3 examples of vector quantities

Answer 2

Velocity
Force
Acceleration
displacement

Question 3

3 scalar quantities

Answer 3

Speed
Mass
Time

Question 4

Examples of non-contact forces

Answer 4

Gravity
Electrostatic forces
Magnetic forces

Question 5

What is difference between weight + mass

Answer 5

Weight takes gravity into account where as mass doesnt
Weight is measured in Newtons
Mass is measured in Kg

Question 6

What is the formula for weight

Answer 6

Weight = mass x gravitational field strength

N Kg N/Kg

Question 7

What is the formula for work done

Answer 7

Work done = force x distance moved

(J) (N) (m)

Question 8

What is the formula for elastic potential energy

Answer 8

Ee = 1/2 x k x e^2

Question 9

What does Hookes law state

Answer 9

Force applied to a spring is proportional to the extension. If the force increases the extension increases too

This only applied if the limit of proportionality has not been reached

Question 10

What is the limit of proportionality

Answer 10

Point when the spring no longer extends despite you adding a bigger force

Question 11

What does a flat line on a distance time graph mean?

Answer 11

Object is stationary

Question 12

What does a flat line on a velocity time graph mean

Answer 12

Constant speed

Question 13

What does a diagonal line on a distance time graph mean

Answer 13

Object is going at a constant speed

Question 14

What does a diagonal line on a velocity time graph mean?

Answer 14

Object has a constant acceleration

Question 15

What does a curved line mean on a distance time graph

Answer 15

Object is accelerating

Question 16

What does a downward diagonal line mean on a velocity time graph

Answer 16

Decelerating

Question 17

What is the formula for acceleration

Answer 17

a = v-u/t

v= is new speed
u= old speed
t= time (seconds)

Question 18

What is the unit for acceleration

Answer 18

m/s^2