Force and Motion

Question 1

State the units of distance, time and speed

Answer 1

distance: km/m
time: h/s
speed: km/h or m/s

Question 2

What is the equation for speed?

Answer 2

v=d/t

Question 3

What does a constant speed on a graph look like in math terms?

Answer 3

linear

Question 4

What does a acceleration on a graph look like in math terms?

Answer 4

exponential going up

Question 5

What does a deacceleration on a graph look like in math terms?

Answer 5

a negative exponential

Question 6

Define force

Answer 6

A push or a pull on an object that can either be contact or non-contact.

Question 7

How can force influence a object?

Answer 7

accelerate , decelerate , stop , start moving , change direction , change shape , or turn.

Question 8

What are examples of contact forces?

Answer 8

friction, air resistance, support, contact, tension and lift

Question 9

List examples of non-contact objects

Answer 9

gravity, magnetism, and electric forces (electricity)

Question 10

Define friction

Answer 10

Friction is the opposing force preventing objects from sliding past each other. It increases as speed increases.

Question 11

How does force and mass affect acceleration?

Answer 11

Acceleration of a body is directly proportional to the net force, and inversely proportional to the mass.

can be calculated by a=F/m (acceleration = force/mass)

e.g. A more massive body requires a greater force to accelerate it than a less massive body.

Question 12

When force is zero…

Answer 12

… then the acceleration is zero.