Copy and complete each of the sentences below to explain how the object’s movement is affected. a When a force acts on a stationary object . . .
b If no force acts on a stationary object . . .
c If a force acts in the opposite direction to the movement of an object . . .
d If no force acts on a moving object

Figure 9 on page 362 shows various motions of balls. the curved path followed by the yellow ball in b in picture b is result of a) inertia b) centripetal motion c) gravity and horizontal velocity d) linear motion

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.