Force & Motion

Question 1

acceleration

Answer 1

rate of change of velocity; can be calculated by dividing the change in the velocity by the time it takes the change to occur.

Question 2

average speed

Answer 2

total distance an object travels divided by the total time it takes to travel that distance.

Question 3

balanced forces

Answer 3

forces on an object that combine to give a zero net force and do not change the motion of the object.

Question 4

constant speed

Answer 4

movement at a set speed

Question 5

energy

Answer 5

the ability to do work

Question 6

force

Answer 6

a push or pull exerted on an object.

Question 7

friction

Answer 7

force that opposes the sliding motion between two touching surfaces.

Question 8

inclined plane

Answer 8

simple machine that consists of a sloping surface, such as a ramp, that reduces the amount of force needed to lift something by increasing the distance over which the force is applied.

Question 9

inertia

Answer 9

resistance of an object to a change in its motion.

Question 10

interval

Answer 10

A definite length of time marked off by two instants

Question 11

kinetic energy

Answer 11

energy a moving object has because of its motion; depends on the mass and speed of the object.

Question 12

motion

Answer 12

an object’s change in position relative to a reference point over a period of time.

Question 13

newtons

Answer 13

N = the SI unit of force

Question 14

potential energy

Answer 14

the energy of position or shape, stored energy

Question 15

pulley

Answer 15

simple machine that consists of a grooved wheel with a rope, chain, or cable running along the groove; can be either fixed or movable.

Question 16

simple machine

Answer 16

any of the basic mechanical devices, including the lever, wheel and axle, pulley, wedge, screw, and inclined plane, one or more of which are essential to any more complex machine

Question 17

speed

Answer 17

distance an object travels per unit of time.

Question 18

unbalanced forces

Answer 18

forces on an object that push in the same direction and cause motion of the object

Question 19

velocity

Answer 19

the speed and direction of a moving object.

Question 20

work

Answer 20

transfer of energy that occurs when a force makes an object move; measured in joules.

Question 21

weight

Answer 21

Also a force
Measured in newtons
Depends on gravity
The force of an object pushing down on the ground and the 
ground pushing up on the object.