18. the graph below represents a car’s motion as it accelerates from rest. which of the following graphs best represents the relationship between the accelerating car’s position and time?
1 point
captionless image

a

b

c

d
19. which of the following examples demonstrates velocity?

a. a 10.0 kg object
b. a truck that traveled 12.5 m
c. a 3.5 kg object moving at 1.5 m/s
d. a car moving northeast at 90 km/hr
20. the graph represents the acceleration of two cars, accel 1 and accel 2, during a road trip. which statement best describes the differences between the two cars' acceleration during the trip?

captionless image
a. accel 1 accelerates throughout the entire trip; accel 2 does not accelerate during the trip.
b. accel 1 rapidly accelerates and then stops; accel 2 maintains a constant velocity during the trip.
c. accel 1 has a constant rate of acceleration; accel 2 accelerates at different rates during the trip.
d. accel 1 accelerates for the first two-thirds of the trip; accel 2 has a constant rate of acceleration.
21. the free-body diagram below represents all the forces acting on an object. what is the net force acting on this object?

captionless image
a) 0 n up
b) 100 n down
c) 200 n right
d) 300 n right
22. which of the following is an example of an object that could have a net force greater than zero acting on it?

a) a glass resting on a table
b) a ball accelerating down a ramp
c) a ladder leaning against a wall
d) a toy car moving east at a constant velocity
23. if the masses of objects increase and their distance from each other remains the same, then the force of gravity between the two objects

a. decreases.
b. increases.
c. remains the same.
d. increases then decreases.
24. an astronaut is making repairs on a satellite in space. the astronaut bumps against the satellite, causing a part to break off. which statement describes the motion of the part after it breaks off the satellite?

a. the part will immediately stop moving when a force is no longer acting on it.
b. the part will accelerate along a straight path until it is acted upon by another force.
c. the part will move at a constant speed along a straight path until it is acted upon by another force.
d. the part will move a short distance until it gradually comes to a stop as its inertia decreases.
25. if a hockey stick acts on a resting puck, what will happen?

a. the puck will remain inert and the hockey stick will accelerate.
b. the puck will balance on the end of the hockey stick until you drop it.
c. the hockey stick will not move the puck, but the puck will move the hockey stick.
d. the hockey stick will change the speed of the puck and make it accelerate.
26. every time your cat’s paw hits her toy string, it swings away from her. how does this demonstrate newton’s third law of motion?

a. objects with mass, such as the cat’s paw and toy string, will require inertia
b. objects in action, such as the string toy, will experience force.
c. for every motion from your cat’s paw, there is unbalanced inertia from the string.
d. for every action your cat makes, there is an equal and opposite reaction from the string.
27. what happens when two objects, such as a baseball and a bat, collide?

a. one remains while the other one moves in the same direction.
b. they hit each other with the same force in opposite directions.
c. they hit each other with unequal force in opposite directions.
d. they hit each other with the same force in the same direction.