The elevator might be accelerating upward.
The elevator might be accelerating downward.
The elevator must be at rest.
The elevator cannot be undergoing uniform motion.
The elevator must not be accelerating.
The amount of material of which you are composed
The gravitational force which Earth exerts on you
The gravitational force you exert on Earth
The force you exert on a set of bathroom scales
None of the above
2.2 x 102 N
1.6 x 102 N
1.1 x 102 N
56 N
28 N
A
B
C
D
E
Has a value of exactgly 9.8 N/kg [down] at all locations on its surface
Is greater at the equator than at the poles
Is smallest at the peak of Mount Everest, the highest elevation
Is largest at the deepest spot on the ocean floor
Is largest at the poles
1.1 x 102 N
1.7 x 104 N
6.9 x 102 N
1.1 x 104 N
6.9 x 103 N
Half as strong if they're moved twice as far apart
Twice as strong if they're moved half as far apart
Four times as strong if they're moved twice as far apart
Four times as strong if they're moved half as far apart
Twice as strong if they're moved twice as far apart
78.4 N/kg
39.2 N/kg
19.6 N/kg
9.8 N/kg
4.9 N/kg
2 : 1
1 : 2
4 : 1
1 : 4
1 : 1
Object's mass
Coefficient of kinetic friction
Normal force
Applied force
Gravitational field strength
Nature of the two surfaces in contact
Mass of the object
Strength of the applied force
Strength of the normal force
Strength of the gravitational force
Must be at rest
Must be just about to move
May be at rest or moving at uniform velocity
Must be accelerating
Must be slowing down
The coefficient of friction changes.
The gravitational force on the brush changes.
The normal force on the brush changes.
The gravitational force begins to act along the metre stick.
An applied force is created.
41 N [up]
41 N [down]
37 N [up]
32 N [up]
32 N [down]
The force that B exerts on A is greater than the force that A exerts on B.
The force that A exerts on B is greater than the force that B exerts on A.
The force that B exerts on A is equal to the force that A exerts on B provided that the system slides with uniform motion.
The force that B exerts on A is equal to the force that A exerts on B regardless of the motion of the system.
The sum of the applied force and the force that B exerts on A is equal to the force that A exerts on B.
1.0 m/s2
1.6 m/s2
2.4 m/s2
2.7 m/s2
5.0 m/s2
30 N
11 N
8.3 N
7.8 N
2.7 N
The frictional force always acts oppositely to the applied force.
For two given surfaces, the coefficient of static friction is generally greater than the coefficient of kinetic friction.
Friction is a force which is unavoidable and serves no practical purpose.
Two very highly-polished surfaces in contact with one another will have very little friction between them.
Friction always acts in the direction of motion.
Could be speeding up or slowing down
Must be speeding up
Must be slowing down
Could be moving with uniform motion
Could be stopped
A
B
C
D
E