forces and motion

Question 1

is displacement vector or scalar

Answer 1

VECTOR

Question 2

equation and units for distance travelled

Answer 2

-speed x time 
(s=vt)
-distance measured in m
-speed measured in m/s
-time measured in s

Question 3

when travelling in a straight line, an object with constant speed will have

Answer 3

constant velocity

Question 4

what happens to the speed and velocity when the object is not travelling in a straight line (so turning around)

Answer 4

• speed will be constant

- velocity will change, because direction has changed

Question 5

an object moving in a circle:

Answer 5

• constantly changing direction, so it is constantly changing velocity
• is ACCELERATING even if it’s travelling at constant speed

Question 6

orbiting planets are an example of what

Answer 6

-an object moving in a circle, force of gravity that causes acceleration

Question 7

what is newton’s first law

Answer 7

-an object will remain in the same state of motion unless acted on by an external force

Question 8

when the resultant force acting on an object is zero:

Answer 8

• if the object is stationary, it remains stationary

- if the object is moving, it continues to move at the same speed and direction, so at constant velocity

Question 9

what is inertia

Answer 9

tendency for objects to continue in the same state of motion

Question 10

if an object is accelerating, the distance-time graph will be a ?

Answer 10

CURVE

Question 11

for an accelerating object, its speed at a particular time is found by:

Answer 11

• drawing a tangent to the curve at the point in time

- working our gradient of tangent

Question 12

velocity of an object will only change if there’s a

Answer 12

resultant force acting on it