P2 Sections 1-3

Question 1

What does the gradient of a distance-time graph represent?

Answer 1

speed

Question 2

Velocity is speed in a given …

Answer 2

direction

Question 3

What are the units of acceleration?

Answer 3

m/s2

Question 4

What does the gradient of velocity-time graph represent?

Answer 4

acceleration

Question 5

How do you calculate the distance travelled from a velocity-time graph?

Answer 5

Calculate the area under the graph

Question 6

what is the resultant force on an object if its velocity is constant

Answer 6

zero

Question 7

What happens to the drag force as the velocity of an object increases?

Answer 7

It increases

Question 8

what do you call the maximum speed an object can fall at?

Answer 8

terminal velocity

Question 9

If you raise an object and increase its gravitational potential energy by 20J, the work you do on the object is …J

Answer 9

20 J

Question 10

What is the principle of conservation of momentum?

Answer 10

Total momentum of a system before the collision = total momentum of a system after the collision provided that no external forces act

Question 11

What are the units of momentum?

Answer 11

kgm/s

Question 12

What is the name given to friction in a liquid or a gas?

Answer 12

Drag

Question 13

For physics equations mass must be measure in…

Answer 13

kg

Question 14

Name 2 car safety features that reduce impact force by increasing stopping time.

Answer 14

Crumple zone and airbags

Question 15

A 2kg mass is accelerated by 3 m/s2 - calculate the force applied.

Answer 15

6N

Question 16

A car is brought to rest from 20m/s in 5 seconds. What is the deceleration?

Answer 16

4m/s2

Question 17

A skater of mass 60kg is moving at 4m/s. What is her momentum?

Answer 17

240 kgm/s

Question 18

Calculate the velocity of a runner who completes 100m in 10 seconds.

Answer 18

10m/s

Question 19

What is the velocity of a stationary object?

Answer 19

0

Question 20

Friction is a force that..

Answer 20

opposes motion

Question 21

Stopping distance =

Answer 21

thinking distance + braking distance

Question 22

What factors affect thinking distance?

Answer 22

Drugs, alcohol, tiredness

Question 23

What factors affect stopping distance?

Answer 23

Road surface, wet or icy roads, worn tyres, worn brakes

Question 24

Which factor affect both thinking and stopping distance?

Answer 24

Speed

Question 25

What is the thinking distance for a car travelling at 45m/s with a driver whose reaction time is 0.2 seconds?

Answer 25

9m

Question 26

What is meant by regenerative braking?

Answer 26

A system which converts the movement energy into electricity.

Question 27

If an object has no resultant force on it what happens to it's motion?

Answer 27

If it is still, it will stay still. If it is moving it will continue at a steady speed in a straight line.

Question 28

Newton's 3rd law states that for every action there is ..

Answer 28

an equal and opposite reaction force

Question 29

What is the force due to gravity called?

Answer 29

Weight

Question 30

What are the units of weight?

Answer 30

Newtons