Forces and Motion

Question 1

What does the gradient of a distance time graph show you?

Answer 1

Speed (or velocity)

Question 2

What does a flat line (gradient = 0) on a distance time graph show you?

Answer 2

No movement (staying still)

Question 3

What does a steep line (high gradient) on a distance time graph show you?

Answer 3

High speed (fast)

Question 4

What does a shallow line (low gradient) on a distance time graph show you?

Answer 4

Low speed (slow)

Question 5

What is velocity?

Answer 5

The same as speed but a direction is also given

Question 6

What does the gradient of a velocity time graph show you?

Answer 6

Acceleration

Question 7

What does a flat line (gradient = 0) on a velocity time graph show you?

Answer 7

Steady (constant) speed

Question 8

What does a steep line (high gradient) on a velocity time graph show you?

Answer 8

Large acceleration

Question 9

What does a shallow line (low gradient) on a velocity time graph show you?

Answer 9

Small accceleration

Question 10

What does the area under a velocity time graph show?

Answer 10

Distance travelled

Question 11

What is the equation linking speed, distance and time?

Answer 11

Speed= Distance/Time

Question 12

What is the equation linking acceleration, change in velocity and time?

Answer 12

Acceleration = change in velocity ÷ time

Question 13

What is the equation linking force, mass and acceleration?

Answer 13

Force = mass x acceleration

Question 14

What is the equation linking weight, mass and g?

Answer 14

Weight = mass x g

Question 15

What are the units of force?

Answer 15

Newton (N)

Question 16

What are the units of acceleration?

Answer 16

m/s^2

Question 17

If you distance was measured in m and your time measured in s, what would your speed be measured in?

Answer 17

m/s

Question 18

If you distance was measured in km and your time measured in hours, what would your speed be measured in?

Answer 18

km/h

Question 19

What is the unit of weight?

Answer 19

N (because it is a force)

Question 20

What is the unit of mass?

Answer 20

Kg (turn g into kg by ÷ 1000)

Question 21

What do unbalanced forces do to an object?

Answer 21

Make it change speed, shape or direction

Question 22

What is the gravitational force called?

Answer 22

Weight (don’t say gravity!!!!)

Question 23

What will happen to an object with balanced forces on it?

Answer 23

Stays at same speed

Question 24

What happens to an object as it falls through the air?

Answer 24

1) The object will have the forces of weight (don’t say gravity!!!) acting downwards and air resistance acting upwards.
2) At the start the forces are unbalanced so the object accelerates (Force = mass x acceleration)
3) As it gets faster, the air resistance increases
4) The air resistance will increase until it is the same size as the weight so the forces are balanced
5) This means the object will stop accelerating and fall at a constant speed called terminal velocity.

Question 25

What is Hooke’s Law?

Answer 25

Force is proportional to extension (up to the elastic limit)

Question 26

What does a material that obeys Hooke’s Law look like on a force-extension graph?

Answer 26

A straight line (through the origin)

Question 27

What is an elastic material?

Answer 27

A material that goes back to its original shape after the deforming force has been removed.