Transcript Slide 1

Forces and Motion Problems Day 1
1. If you have 2 people pushing a box in the
same direction and the 1st person is using a
force of 4 Newtons and the 2nd person is using a
force of 3 Newtons, what is the total net force?
7 Newtons
2. Jack and Jill are pushing a cart toward each
other. Jack uses a force of 7 Newtons while Jill
uses a force of 3 Newtons. What is the net
force being used? Whose direction is the force
going against?
3. If James is pushing a crate using 5 Newtons
and Jeff is also pushing the crate, but in
James’s direction, using 5 Newtons, what is the
net force being used?
4. Which problems indicate an unbalanced force?
4 Newtons
Against Jill
0 Newtons
1 and 2
Forces and Motion Problems Day 2
Force = Mass x Acceleration
1. If a bird with a mass of 2 kg is accelerating at a speed of 3
m/s/s, what is the force (in Newtons) being used by the bird?
6 Newtons
2. A snow skier with a mass of 60 kg is accelerating at a
speed of 7 m/s/s, what is the force being used by the skier?
420 Newtons
3. How much force is being used to accelerate a 55 kg cart at
15 m/s/s?
825 Newtons
Forces and Motion Problems Day 3
Force = Mass x Acceleration
Acceleration = Force / Mass
Mass = Force / Acceleration
F=MxA
A=F/M
M = F/A
1. If a ball was accelerating at a velocity of 12 m/s/s and the
force that started it was 3600 Newtons, what is the mass of
300 kg
that ball
(in kg)?
2. If a force of 1920 Newtons was used to accelerate you at
8 m/s/s, what (in kg) is your mass?
240 kg
3. If a 17000 kg rocket is being accelerated at 62 m/s/s,
what is the force being used to accelerate it?
1054000 Newtons
Forces and Motion Problems Day 4
Weight on Earth = Mass x 9.8
Weight can be expressed in terms of Newtons
1. How much would a person weigh on Earth
274.4 Newtons
if they had a mass of 28 kg?
2. How much would a person weigh on Earth
if they had a mass of 13 kg?
127.4 Newtons
3. How much would a person weigh on Earth 6.86 Newtons
if they had a mass of .7 kg
Forces and Motion Problems Day 5
Momentum = Mass x Velocity
1. What is the momentum on a 3 kg hammer
if the velocity of the swing of it is 1.5 m/s?
4.5 kg-m/s
2. What is the momentum of a .045 kg golf
.72 kg-m/s
ball traveling at 16 m/s?
3. Which has more momentum, a 700 kg car
traveling at 40 m/s or a 480 kg car
The 480 kg car
traveling at 70 m/s?
Forces and Motion Problems Day 6
1. 2 people are pushing a box in the same
direction. The 1st person is using a force of 12
Newtons and the 2nd person is using a force of 7
Newtons. What is the total net force?
19
Newtons
2. Jack and Jill are pushing a cart toward each
other. Jack uses a force of 8 Newtons while Jill
uses a force of 8 Newtons. What is the net
force being used?
0 Newtons
3. If James is pushing a crate using 28 Newtons
and Jeff is also pushing the crate, but in
James’s direction, using 14 Newtons, what is
the net force being used?
14
Newtons
4. Which problems indicate an unbalanced force? 1 and 3
Forces and Motion Problems Day 7
Force = Mass x Acceleration
1. If a bird with a mass of 24 kg is accelerating at a speed of
3 m/s/s, what is the force (in Newtons) being used by the
bird?
72
Newtons
2. A water skier with a mass of 60 kg is accelerating at a
speed of 10 m/s/s, what is the force being used by the
600 Newtons
skier?
3. How much force is being used to accelerate a 40 kg cart at
15 m/s/s?
600 Newtons
Forces and Motion Problems Day 8
Weight on Earth = Mass x 9.8
Weight can be expressed in terms of Newtons
1. How much would a person weigh on Earth
if they had a mass of 45 kg?
441 Newtons
2. If a person weighs on Earth 813.4 N,
what is their mass?
83 kg
3. How much would a person weigh on Earth 166.6
Newtons
if they had a mass of 17 kg