Download File - Lanier Bureau of Investigation

Review worksheet
Student Name ____________________
1. Which of the following statements are true about gravitational force? Identify all that apply.
a.
The gravitational force only acts between very, very massive objects.
b.
The gravitational force between an object and the earth is related to the distance between the
object's and the earth's center.
c.
The weight of an item can be accurately calculated by multiplying the object mass by the gravity
(m•g).
d.
The gravitational force acting upon an object is the same as the weight of the object.
e.
The closer two items are to each other, the larger the gravitational force.
f.
Orbiting astronauts do not experience a force of gravity; this explains why they feel weightless.
g.
Circle the “planets” which of the following has greater gravitational attraction.
1.
2.
3.
4.
h. The moon orbits around the Earth and not Mars because the Earth has more mass.
i. Weightlessness is actually freefall where astronauts are falling at the same rate as the ship they
are in
j. If a bowling ball and a tennis ball are dropped from the top of the school (assuming no air
resistance or wind) then the bowling ball will fall first.
2.
Which of the following statements are true about forces? Identify all that apply.
a. A force is a push or a pull.
b. Only gravity and weight are forces.
c. Two equal forces going in the same direction cancel each other out.
d. Two equal forces going in opposite directions cancel each other out.
e. Based on Newton’s second law of motion, more mass means more force.
f.
To move more mass, you have to have greater force.
g. An object with less mass has more inertia than an object with larger mass.
h. If forces are balanced then there is movement.
i.
Friction, gravity and weight are all forces.
j.
Wheels on cars reduce the amount of friction.
k. Sitting in a chair is an example of the first and third law of motion.
3. Which of the following statements are true about speed, velocity and acceleration? Identify all that
apply.
a. Velocity includes speed and acceleration.
b. A distance/time graph measures speed.
c. The formula for speed is distance divided by time.
d. A distance/time graph of constant speed and velocity is a straight line.
e. Velocity changes when speed changes
f. You can combine velocities by adding if they are going the same direction.
g. Acceleration is the rate at which velocity can change.
h. If speed changes, velocity changes and so there is acceleration.
i.
A velocity/time graph of acceleration is a straight line.
j.
Constant velocity on a velocity time graph is a straight line parallel to the X axis.
4. Which of the following statements are true about work and power are true? Identify all that apply
a. Holding a child is work.
b. Carrying a child is work.
c. Throwing a child is work.
d. If Katelyn picked up the child and put it on the lab table and Bernard picked up the child
and put it on the lab table; Katelyn did more work.
e. If Bernard picked up the child faster than Katelyn, he did more work.
f.
If Katelyn picked up the child faster than Bernard, she had more power.
g. You use an electrical tool because it results in less work.
5. Which of the following statements are true about simple machines are true? Identify all that apply.
a. Machines make work easier by making work faster.
b. Machines trade off distance and force.
c. The work you put into a machine can be called work input, effort input, work force or effort
force.
d. When using a machine, if you are required to use a larger force then you must use a larger
distance to accomplish a task than if you were to do it by hand.
e. If you use a small force applied over a long distance and you are trying to change directions
of the force (think pulley and levers), then the result is a small force over a long distance.
f.
A pair of scissors includes a wedge and a lever.
g. A bicycle has a greater number of simple machines than a nail clipper.
h. A wheelbarrow is an inclined plane, a wheel and axle and a wedge.
i.
Examples of levers include: hammers, knives, door handles, staplers and can openers