1. Gravitational force
Gravity

2. Gravitational force INCREASES with Mass DECREASES with Distance

3. All objects in the universe are attracted to each other by the force of
effort.
friction.
gravity.
inertia.

4. 1 kilogram and 2 kilograms 2 kilograms and 1 kilogram
Four pairs of objects have the masses shown below. If the objects in each pair are the same distance apart, the gravitational force between the objects in which pair is greatest?
1 kilogram and 1 kilogram
1 kilogram and 2 kilograms
2 kilograms and 1 kilogram
2 kilograms and 2 kilograms

5. As an astronaut travels from Earth to a space station orbiting Earth, what happens to her mass and weight? Her mass decreases, but her weight remains the same. Her mass increases as her weight decreases. Her mass remains the same, but her weight decreases. Her mass decreases and her weight also decreases.

6. Which hill would you slide down the fastest? hill A hill B hill C
It would take the same time to slide down all of the hills.

7. 50 39.2 29.4 19.6 9.8 Projectile Motion 3 1 2 Velocity (m/s) seconds
forward downward 50
39.2
29.4
19.6
9.8
seconds 3 1 2

8. Projectile
Motion
Velocity (m/s)
forward downward 48 47 46 50 49
39.2
29.4
19.6
9.8
seconds 3 1 2

9. Simple Machines and work
Lever
Inclined plane
Pulley
Wedge
Screw
Wheel and axle

10. Simple Machines Pulley Wheel & Axle Lever Inclined plane Screw Wedge
Gear

12. Simple Machines Pulley Wheel & Axle Lever Inclined plane Screw Wedge
Gear

13. Which activity involves the use of a simple machine?
riding on a seesaw
flying a kite
listening to a radio
skiing down a hill

14. Lever
Wheel/Axle
Pulley
Wheel & Axle

15. Simple Machine
A mechanism that lowers the amount of force needed to do work, by increasing the distance.

16. On which simple machine is a fulcrum found?
pulley
wheel
axle
lever

17. ALL Simple Machines work the same way
Force
Distance x

18. Lever action 2 meters 1 meter Force= ? Force=13 N

19. Advantage= final distance starting distance
Mechanical
Advantage= final distance
starting distance
9 meters
3 meters

20. Mechanical Advantage= distance distance 8 meters 2 meters

21. Satellites stay in place as they orbit because of . . .
the repeated firing of rocket boosters.
the gravitational pull of Earth.
a narrow path through the vacuum of space.
solar panels generating energy to hold them in place