P2 Forces Revision

Question 1

Distance travelled =

Answer 1

speed x time

Question 2

Balanced forces produce……

Answer 2

constant velocity

Question 3

Unbalanced forces produce …..

Answer 3

acceleration in the direction of the force

Question 4

Vector quantities

Answer 4

have size and direction

Question 5

Scalar quantities

Answer 5

only have size

Question 6

The gradient of a distance time graph tells you …

Answer 6

the velocity

Question 7

The gradient of a velocity time graph tells you …

Answer 7

the acceleration

Question 8

The unit of velocity is ….

Answer 8

m/s

Question 9

The unit of force is ….

Answer 9

N

Question 10

The area under a velocity time graph tells you ….

Answer 10

the distance travelled

Question 11

Stopping distance =

Answer 11

Thinking distance + Braking distance

Question 12

Thinking distance is affected by ….

Answer 12

things that affect the driver (tiredness, alcohol) and the speed of the vehicle

Question 13

Braking distance is affected by ….

Answer 13

things that affect the car brakes or the road surface as well as the speed of the vehicle

Question 14

Terminal velocity occurs when …….

Answer 14

Weight and Air Resistance forces are balanced

Question 15

What happens to air resistance as speed increases?

Answer 15

Air resistance increases

Question 16

Momentum depends on

Answer 16

mass and velocity (momentum = mass x velocity)

Question 17

When an object is dropped …

Answer 17

gravitational potential energy turns into kinetic energy

Question 18

When an object is lifted ……

Answer 18

kinetic energy turns into gravitational potential energy

Question 19

Seat belts and air bags work by…..

Answer 19

increasing the time over which an object is brought to a halt, reducing the force needed.

Question 20

Hooke’s law states that

Answer 20

force and extension are directly proportional

Question 21

the gradient of a force extension graph ….

Answer 21

gives you the spring constant k

Question 22

When the elastic limit of an object is exceeded …..

Answer 22

the object will not return to its original length

Question 23

A mass of 70Kg on earth will have a weight of …

Answer 23

700N (70 x 10 = 700)

Question 24

Mass = 3 Kg, Velocity = 10m/s, Momentum = ?

Answer 24

Momentum = m x v = 3 x 10 = 30Kgm/s

Question 25

Mass = 3 Kg, Velocity = 10m/s, KE = ?

Answer 25

KE = 1/2 x 3 x 10 x 10 = 150J

Question 26

Mass = 3Kg, Height = 20m, GPE = ?

Answer 26

GPE = 3 x 10 x 20 = 600J

Question 27

Momentum is conserved means …….

Answer 27

total momentum after collision = total momentum before collision

Question 28

Force = 30N, Distance moved = 6m, Work done = ?

Answer 28

Work done = F x d = 30 x 6 = 180J